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d484d2f684
This now gives a clean RAT check with bin/check-rat-report.py, which is one way for the Impala community to check compliance with ASF rules on intellectual property. Change-Id: I2ad06435f84a65ba126759e42a18fdaf52cd7036 Reviewed-on: http://gerrit.cloudera.org:8080/5232 Reviewed-by: Jim Apple <jbapple-impala@apache.org> Tested-by: Impala Public Jenkins Reviewed-by: John Russell <jrussell@cloudera.com>
669 lines
26 KiB
XML
669 lines
26 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="webui">
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<title id="webui_title">Impala Web User Interface for Debugging</title>
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<titlealts audience="PDF"><navtitle>Web User Interface</navtitle></titlealts>
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<prolog>
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<metadata>
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<data name="Category" value="Impala"/>
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<data name="Category" value="Troubleshooting"/>
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<data name="Category" value="Administrators"/>
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<data name="Category" value="Developers"/>
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<data name="Category" value="Data Analysts"/>
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</metadata>
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</prolog>
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<conbody>
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<p id="webui_intro">
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<indexterm audience="Cloudera">web UI</indexterm>
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<indexterm audience="Cloudera">debug UI</indexterm>
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Each of the Impala daemons (<cmdname>impalad</cmdname>, <cmdname>statestored</cmdname>,
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and <cmdname>catalogd</cmdname>) includes a built-in web server that displays
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diagnostic and status information:
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<ul>
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<li>
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<p>
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The <cmdname>impalad</cmdname> web UI (default port: 25000) includes
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information about configuration settings, running and completed queries, and associated performance and
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resource usage for queries. In particular, the <uicontrol>Details</uicontrol> link for each query displays
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alternative views of the query including a graphical representation of the plan, and the
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output of the <codeph>EXPLAIN</codeph>, <codeph>SUMMARY</codeph>, and <codeph>PROFILE</codeph>
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statements from <cmdname>impala-shell</cmdname>.
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Each host that runs the <cmdname>impalad</cmdname> daemon has
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its own instance of the web UI, with details about those queries for which that
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host served as the coordinator. To get a consolidated view for all queries,
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it is usually more convenient to use the charts, graphs, and other monitoring
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features in Cloudera Manager. The <cmdname>impalad</cmdname> web UI is mainly
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for diagnosing query problems that can be traced to a particular node.
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</p>
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</li>
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<li>
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<p>
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The <cmdname>statestored</cmdname> web UI (default port: 25010) includes
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information about memory usage, configuration settings, and ongoing health checks
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performed by this daemon. Because there is only a single instance of this
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daemon within any cluster, you view the web UI only on the particular host
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that serves as the Impala Statestore.
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</p>
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</li>
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<li>
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<p>
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The <cmdname>catalogd</cmdname> web UI (default port: 25020) includes
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information about the databases, tables, and other objects managed by Impala,
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in addition to the resource usage and configuration settings of the daemon itself.
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The catalog information is represented as the underlying Thrift data structures.
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Because there is only a single instance of this daemon within any cluster, you view the
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web UI only on the particular host that serves as the Impala Catalog Server.
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</p>
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</li>
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</ul>
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</p>
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<note>
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<p>
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The web user interface is primarily for problem diagnosis and troubleshooting. The items listed and their
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formats are subject to change. To monitor Impala health, particularly across the entire cluster at once, use
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the Cloudera Manager interface.
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</p>
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</note>
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<p outputclass="toc inpage"/>
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</conbody>
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<concept id="webui_impalad">
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<title>Debug Web UI for impalad</title>
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<conbody>
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<p>
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To debug and troubleshoot the <cmdname>impalad</cmdname> daemon using a web-based interface, open the URL
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<codeph>http://<varname>impala-server-hostname</varname>:25000/</codeph> in a browser. (For secure
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clusters, use the prefix <codeph>https://</codeph> instead of <codeph>http://</codeph>.) Because each
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Impala node produces its own set of debug information, choose a specific node that you are curious about or
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suspect is having problems.
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</p>
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<note>
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To get a convenient picture of the health of all Impala nodes in a cluster, use the Cloudera Manager
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interface, which collects the low-level operational information from all Impala nodes, and presents a
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unified view of the entire cluster.
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</note>
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</conbody>
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<concept audience="Cloudera" id="webui_impalad_disabling">
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<title>Turning off the Web UI for impalad</title>
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<conbody>
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<p></p>
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</conbody>
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</concept>
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<concept id="webui_impalad_main">
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<title>Main Page</title>
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<conbody>
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<p>
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By default, the main page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/</codeph> (secure cluster).
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</p>
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<p>
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This page lists the version of the <cmdname>impalad</cmdname> daemon, plus basic hardware and software
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information about the corresponding host, such as information about the CPU, memory, disks, and operating
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system version.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_backends">
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<title>Backends Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>backends</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/backends</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/backends</codeph> (secure cluster).
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</p>
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<p>
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This page lists the host and port info for each of the <cmdname>impalad</cmdname> nodes in the cluster.
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Because each <cmdname>impalad</cmdname> daemon knows about every other <cmdname>impalad</cmdname> daemon
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through the statestore, this information should be the same regardless of which node you select. Links
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take you to the corresponding debug web pages for any of the other nodes in the cluster.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_catalog">
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<title>Catalog Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>catalog</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/catalog</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/catalog</codeph> (secure cluster).
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</p>
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<p>
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This page displays a list of databases and associated tables recognized by this instance of
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<cmdname>impalad</cmdname>. You can use this page to locate which database a table is in, check the
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exact spelling of a database or table name, look for identical table names in multiple databases, and so
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on.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_logs">
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<title>Logs Page</title>
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<prolog>
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<metadata>
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<data name="Category" value="Logs"/>
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</metadata>
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</prolog>
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<conbody>
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<p>
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By default, the <uicontrol>logs</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/logs</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/logs</codeph> (secure cluster).
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</p>
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<p>
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This page shows the last portion of the <filepath>impalad.INFO</filepath> log file, the most detailed of
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the info, warning, and error logs for the <cmdname>impalad</cmdname> daemon. You can refer here to see
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the details of the most recent operations, whether the operations succeeded or encountered errors. This
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central page can be more convenient than looking around the filesystem for the log files, which could be
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in different locations on clusters that use Cloudera Manager or not.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_memz">
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<title>Memz Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>memz</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/memz</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/memz</codeph> (secure cluster).
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</p>
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<p>
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This page displays summary and detailed information about memory usage by the <cmdname>impalad</cmdname>
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daemon. You can see the memory limit in effect for the node, and how much of that memory Impala is
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currently using.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_metrics">
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<title>Metrics Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>metrics</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/metrics</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/metrics</codeph> (secure cluster).
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</p>
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<p>
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This page displays the current set of metrics: counters and flags representing various aspects of
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<cmdname>impalad</cmdname> internal operation. For the meanings of these metrics, see
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<xref href="http://www.cloudera.com/documentation/enterprise/latest/topics/cm_metrics_impala.html" scope="external" format="html">Impala
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Metrics</xref> in the Cloudera Manager documentation.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_queries">
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<title>Queries Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>queries</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/queries</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/queries</codeph> (secure cluster).
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</p>
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<p>
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This page lists all currently running queries, plus any completed queries whose details still reside in
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memory. The queries are listed in reverse chronological order, with the most recent at the top. (You can
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control the amount of memory devoted to completed queries by specifying the
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<codeph>--query_log_size</codeph> startup option for <cmdname>impalad</cmdname>.)
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</p>
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<p>
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On this page, you can see at a glance how many SQL statements are failing (<codeph>State</codeph> value
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of <codeph>EXCEPTION</codeph>), how large the result sets are (<codeph># rows fetched</codeph>), and how
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long each statement took (<codeph>Start Time</codeph> and <codeph>End Time</codeph>).
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</p>
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<p>
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Each query has an associated link that displays the detailed query profile, which you can examine to
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understand the performance characteristics of that query. See
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<xref href="impala_explain_plan.xml#perf_profile"/> for details.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_sessions">
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<title>Sessions Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>sessions</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/sessions</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/sessions</codeph> (secure cluster).
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</p>
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<p>
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This page displays information about the sessions currently connected to this <cmdname>impalad</cmdname>
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instance. For example, sessions could include connections from the <cmdname>impala-shell</cmdname>
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command, JDBC or ODBC applications, or the Impala Query UI in the Hue web interface.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_threadz">
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<title>Threadz Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>threadz</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/threadz</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/threadz</codeph> (secure cluster).
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</p>
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<p>
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This page displays information about the threads used by this instance of <cmdname>impalad</cmdname>,
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and shows which categories they are grouped into. Making use of this information requires substantial
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knowledge about Impala internals.
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</p>
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</conbody>
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</concept>
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<concept id="webui_impalad_varz">
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<title>Varz Page</title>
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<conbody>
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<p>
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By default, the <uicontrol>varz</uicontrol> page of the debug web UI is at
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<codeph>http://<varname>impala-server-hostname</varname>:25000/varz</codeph> (non-secure cluster) or
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<codeph>https://<varname>impala-server-hostname</varname>:25000/varz</codeph> (secure cluster).
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</p>
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<p>
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This page shows the configuration settings in effect when this instance of <cmdname>impalad</cmdname>
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communicates with other Hadoop components such as HDFS and YARN. These settings are collected from a set
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of configuration files; Impala might not actually make use of all settings.
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</p>
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<p>
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The bottom of this page also lists all the command-line settings in effect for this instance of
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<cmdname>impalad</cmdname>. See <xref href="impala_config_options.xml#config_options"/> for information
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about modifying these values.
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</p>
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</conbody>
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</concept>
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</concept>
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|
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<concept audience="Cloudera" id="webui_statestored">
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<title>Debug Web UI for statestored</title>
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<conbody>
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<p></p>
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</conbody>
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<concept audience="Cloudera" id="webui_statestored_disabling">
|
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<title>Turning off the Web UI for statestored</title>
|
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|
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<conbody>
|
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|
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<p></p>
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</conbody>
|
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</concept>
|
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<concept id="webui_statestored_main">
|
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|
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<title>Main Page</title>
|
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|
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<conbody>
|
|
|
|
<p>
|
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By default, the main page of the debug web UI is at
|
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<codeph>http://<varname>impala-server-hostname</varname>:25010/</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25010/</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page lists the version of the <cmdname>impalad</cmdname> daemon, plus basic hardware and software
|
|
information about the corresponding host, such as information about the CPU, memory, disks, and operating
|
|
system version.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_statestored_logs">
|
|
|
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<title>Logs Page</title>
|
|
|
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<conbody>
|
|
|
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<p>
|
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By default, the <uicontrol>logs</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25010/logs</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25010/logs</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page shows the last portion of the <filepath>impalad.INFO</filepath> log file, the most detailed of
|
|
the info, warning, and error logs for the <cmdname>impalad</cmdname> daemon. You can refer here to see
|
|
the details of the most recent operations, whether the operations succeeded or encountered errors. This
|
|
central page can be more convenient than looking around the filesystem for the log files, which could be
|
|
in different locations on clusters that use Cloudera Manager or not.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_statestored_memz">
|
|
|
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<title>Memz Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>memz</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25010/memz</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25010/memz</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page displays summary and detailed information about memory usage by the <cmdname>impalad</cmdname>
|
|
daemon. You can see the memory limit in effect for the node, and how much of that memory Impala is
|
|
currently using.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_statestored_metrics">
|
|
|
|
<title>Metrics Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>metrics</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25010/metrics</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25010/metrics</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page displays the current set of metrics: counters and flags representing various aspects of
|
|
<cmdname>impalad</cmdname> internal operation. For the meanings of these metrics, see
|
|
<xref href="http://www.cloudera.com/documentation/enterprise/latest/topics/cm_metrics_impala.html" scope="external" format="html">Impala
|
|
Metrics</xref> in the Cloudera Manager documentation.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_statestored_subscribers">
|
|
|
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<title>Subscribers Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
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|
By default, the <uicontrol>subscribers</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25010/subscribers</codeph> (non-secure cluster)
|
|
or <codeph>https://<varname>impala-server-hostname</varname>:25010/subscribers</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page displays information about...
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_statestored_threadz">
|
|
|
|
<title>Threadz Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>threadz</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25010/threadz</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25010/threadz</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page displays information about the threads used by this instance of <cmdname>impalad</cmdname>,
|
|
and shows which categories they are grouped into. Making use of this information requires substantial
|
|
knowledge about Impala internals.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_statestored_topics">
|
|
|
|
<title>Topics Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>topics</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25010/topics</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25010/topics</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page displays information about...
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_statestored_varz">
|
|
|
|
<title>Varz Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>varz</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25010/varz</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25010/varz</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page shows the configuration settings in effect when this instance of <cmdname>impalad</cmdname>
|
|
communicates with other Hadoop components such as HDFS and YARN. These settings are collected from a set
|
|
of configuration files; Impala might not actually make use of all settings.
|
|
</p>
|
|
|
|
<p>
|
|
The bottom of this page also lists all the command-line settings in effect for this instance of
|
|
<cmdname>impalad</cmdname>. See <xref href="impala_config_options.xml#config_options"/> for information
|
|
about modifying these values.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
</concept>
|
|
|
|
<concept audience="Cloudera" id="webui_catalogd">
|
|
|
|
<title>Debug Web UI for catalogd</title>
|
|
|
|
<conbody>
|
|
|
|
<p></p>
|
|
</conbody>
|
|
|
|
<concept audience="Cloudera" id="webui_catalogd_disabling">
|
|
|
|
<title>Turning off the Web UI for impalad</title>
|
|
|
|
<conbody>
|
|
|
|
<p></p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_catalogd_main">
|
|
|
|
<title>Main Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the main page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25020/</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25020/</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page lists the version of the <cmdname>impalad</cmdname> daemon, plus basic hardware and software
|
|
information about the corresponding host, such as information about the CPU, memory, disks, and operating
|
|
system version.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_catalogd_catalog">
|
|
|
|
<title>Catalog Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>catalog</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25020/catalog</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25020/catalog</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page displays a list of databases and associated tables recognized by this instance of
|
|
<cmdname>impalad</cmdname>. You can use this page to locate which database a table is in, check the
|
|
exact spelling of a database or table name, look for identical table names in multiple databases, and so
|
|
on.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_catalogd_logs">
|
|
|
|
<title>Logs Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>logs</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25020/logs</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25020/logs</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page shows the last portion of the <filepath>impalad.INFO</filepath> log file, the most detailed of
|
|
the info, warning, and error logs for the <cmdname>impalad</cmdname> daemon. You can refer here to see
|
|
the details of the most recent operations, whether the operations succeeded or encountered errors. This
|
|
central page can be more convenient than looking around the filesystem for the log files, which could be
|
|
in different locations on clusters that use Cloudera Manager or not.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_catalogd_metrics">
|
|
|
|
<title>Metrics Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>metrics</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25020/metrics</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25020/metrics</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page displays the current set of metrics: counters and flags representing various aspects of
|
|
<cmdname>impalad</cmdname> internal operation. For the meanings of these metrics, see
|
|
<xref href="http://www.cloudera.com/documentation/enterprise/latest/topics/cm_metrics_impala.html" scope="external" format="html">Impala
|
|
Metrics</xref> in the Cloudera Manager documentation.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
|
|
<concept id="webui_catalogd_varz">
|
|
|
|
<title>Varz Page</title>
|
|
|
|
<conbody>
|
|
|
|
<p>
|
|
By default, the <uicontrol>varz</uicontrol> page of the debug web UI is at
|
|
<codeph>http://<varname>impala-server-hostname</varname>:25020/varz</codeph> (non-secure cluster) or
|
|
<codeph>https://<varname>impala-server-hostname</varname>:25020/varz</codeph> (secure cluster).
|
|
</p>
|
|
|
|
<p>
|
|
This page shows the configuration settings in effect when this instance of <cmdname>impalad</cmdname>
|
|
communicates with other Hadoop components such as HDFS and YARN. These settings are collected from a set
|
|
of configuration files; Impala might not actually make use of all settings.
|
|
</p>
|
|
|
|
<p>
|
|
The bottom of this page also lists all the command-line settings in effect for this instance of
|
|
<cmdname>impalad</cmdname>. See <xref href="impala_config_options.xml#config_options"/> for information
|
|
about modifying these values.
|
|
</p>
|
|
</conbody>
|
|
</concept>
|
|
</concept>
|
|
</concept>
|