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When an exchange node reaches its row count limit, the current code will not notify the sender fragments about it. Consequently, sender fragments may keep sending row batches to the exchange node but they won't be dequeued anymore. The sender fragments may end up blocking in the RPC indefinitely until either the query is cancelled or closed. This change fixes the problem above by cancelling the underlying receiver's streams of an exchange node once it reaches the row count limit. This will unblock all senders whose TransmitData() RPCs haven't been replied to yet. Any future row batches sent to this receiver will also be immediately replied to with a response indicating that this receiver is already closed so the sender will stop sending any more row batches to it. Change-Id: I10c805e9d63ed8af9f458bf71e8ef5ea9376b939 Reviewed-on: http://gerrit.cloudera.org:8080/14101 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
68 lines
2.9 KiB
Python
68 lines
2.9 KiB
Python
# 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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#
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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,
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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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import pytest
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from tests.common.custom_cluster_test_suite import CustomClusterTestSuite
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from tests.common.impala_cluster import ImpalaCluster
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from tests.verifiers.metric_verifier import MetricVerifier
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class TestExchangeEos(CustomClusterTestSuite):
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""" Test to verify that the senders' fragments get unblocked and run to completion
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after exchange node hits eos"""
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@classmethod
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def get_workload(cls):
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return 'tpch'
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@classmethod
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def add_test_dimensions(cls):
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super(CustomClusterTestSuite, cls).add_test_dimensions()
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cls.ImpalaTestMatrix.add_constraint(lambda v:
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v.get_value('table_format').file_format == 'parquet')
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@pytest.mark.execute_serially
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@CustomClusterTestSuite.with_args(cluster_size=9, num_exclusive_coordinators=1)
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def test_exchange_eos(self, vector):
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""" Test IMPALA-8845: runs with result spooling enabled and defers the fetching
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of results until all non-coordinator fragments have completed. It aims to verify
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that once the coordinator fragment reaches eos, the rest of the fragments will
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get unblocked. Using a cluster of size 9 which can reliably reproduce the hang of
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some non-coordinator fragments without the fix of IMPALA-8845.
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"""
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cluster = ImpalaCluster.get_e2e_test_cluster()
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coordinator = cluster.get_first_impalad()
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client = coordinator.service.create_beeswax_client()
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vector.get_value('exec_option')['spool_query_results'] = 'true'
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for query in ["select * from tpch.lineitem order by l_orderkey limit 10000",
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"select * from tpch.lineitem limit 10000"]:
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handle = self.execute_query_async_using_client(client, query, vector)
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for impalad in ImpalaCluster.get_e2e_test_cluster().impalads:
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verifier = MetricVerifier(impalad.service)
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if impalad.get_webserver_port() == coordinator.get_webserver_port():
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num_fragments = 1
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else:
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num_fragments = 0
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verifier.wait_for_metric("impala-server.num-fragments-in-flight", num_fragments)
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results = client.fetch(query, handle)
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assert results.success
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assert len(results.data) == 10000
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client.close()
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