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The Impala CatalogService manages the caching and dissemination of cluster-wide metadata. The CatalogService combines the metadata from the Hive Metastore, the NameNode, and potentially additional sources in the future. The CatalogService uses the StateStore to broadcast metadata updates across the cluster. The CatalogService also directly handles executing metadata updates request from impalad servers (DDL requests). It exposes a Thrift interface to allow impalads to directly connect execute their DDL operations. The CatalogService has two main components - a C++ server that implements StateStore integration, Thrift service implementiation, and exporting of the debug webpage/metrics. The other main component is the Java Catalog that manages caching and updating of of all the metadata. For each StateStore heartbeat, a delta of all metadata updates is broadcast to the rest of the cluster. Some Notes On the Changes --- * The metadata is all sent as thrift structs. To do this all catalog objects (Tables/Views, Databases, UDFs) have thrift struct to represent them. These are sent with each statestore delta update. * The existing Catalog class has been seperated into two seperate sub-classes. An ImpladCatalog and a CatalogServiceCatalog. See the comments on those classes for more details. What is working: * New CatalogService created * Working with statestore delta updates and latest UDF changes * DDL performed on Node 1 is now visible on all other nodes without a "refresh". * Each DDL operation against the Catalog Service will return the catalog version that contains the change. An impalad will wait for the statestore heartbeat that contains this version before returning from the DDL comment. * All table types (Hbase, Hdfs, Views) getting their metadata propagated properly * Block location information included in CS updates and used by Impalads * Column and table stats included in CS updates and used by Impalads * Query tests are all passing Still TODO: * Directly return catalog object metadata from DDL requests * Poll the Hive Metastore to detect new/dropped/modified tables * Reorganize the FE code for the Catalog Service. I don't think we want everything in the same JAR. Change-Id: I8c61296dac28fb98bcfdc17361f4f141d3977eda Reviewed-on: http://gerrit.ent.cloudera.com:8080/601 Reviewed-by: Lenni Kuff <lskuff@cloudera.com> Tested-by: Lenni Kuff <lskuff@cloudera.com>
50 lines
1.9 KiB
Python
Executable File
50 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (c) 2012 Cloudera, Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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from tests.common.impala_test_suite import ImpalaTestSuite
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import time
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import pytest
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class TestInsertBehaviour(ImpalaTestSuite):
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"""Tests for INSERT behaviour that isn't covered by checking query results"""
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def test_insert_preserves_hidden_files(self):
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"""Test that INSERT OVERWRITE preserves hidden files in the root table directory"""
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table_dir = "test-warehouse/functional.db/insert_overwrite_nopart/"
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hidden_file_locations = [".hidden", "_hidden"]
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dir_locations = ["dir", ".hidden_dir"]
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for dir in dir_locations:
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self.hdfs_client.make_dir(table_dir + dir)
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for file in hidden_file_locations:
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self.hdfs_client.create_file(table_dir + file, '', overwrite=True)
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self.client.execute("""INSERT OVERWRITE
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functional.insert_overwrite_nopart SELECT int_col FROM functional.tinyinttable""")
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for file in hidden_file_locations:
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try:
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self.hdfs_client.get_file_dir_status(table_dir + file)
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except:
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err_msg = "Hidden file '%s' was unexpectedly deleted by INSERT OVERWRITE"
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pytest.fail(err_msg % (table_dir + file))
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for dir in dir_locations:
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try:
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self.hdfs_client.get_file_dir_status(table_dir + file)
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except:
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err_msg = "Directory '%s' was unexpectedly deleted by INSERT OVERWRITE"
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pytest.fail(err_msg % (table_dir + dir))
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