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We realized that the libHDFS API call hdfsGetHedgedReadMetrics() crashes when the 'fs' argument passed to it is not a HDFS filesystem. There is an open bug for it on the HDFS side: HDFS-13417 However, it looks like we won't be getting a fix for it in the short term, so our only option at this point is to skip it. Testing: Made sure that enabling preads and scanning from S3 doesn't cause a crash. Also, added a custom cluster test to exercise the pread code path. We are unable to verify hedged reads in a minicluster, but we can at least exercise the code path to make sure that nothing breaks. Change-Id: I48fe80dfd9a1ed68a8f2b7038e5f42b5a3df3baa Reviewed-on: http://gerrit.cloudera.org:8080/9966 Reviewed-by: Sailesh Mukil <sailesh@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
31 lines
1.3 KiB
Python
31 lines
1.3 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.skip import SkipIf
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@SkipIf.not_hdfs
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class TestHedgedReads(CustomClusterTestSuite):
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""" Exercises the hedged reads code path.
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NOTE: We unfortunately cannot force hedged reads on a minicluster, but we enable
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this test to at least make sure that the code path doesn't break."""
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@CustomClusterTestSuite.with_args("--use_hdfs_pread=true")
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def test_hedged_reads(self, vector):
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QUERY = "select * from tpch_parquet.lineitem limit 100"
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self.client.execute(QUERY)
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