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From "Josh Rosen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-5227) InputOutputMetricsSuite "input metrics when reading text file with multiple splits" test fails in branch-1.2 SBT Jenkins build w/hadoop1.0 and hadoop2.0 profiles
Date Fri, 13 Feb 2015 19:51:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-5227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320653#comment-14320653
] 

Josh Rosen commented on SPARK-5227:
-----------------------------------

I think this might be caused by HADOOP-8490: the test code might be getting a cached FileSystem
instance that was created by an earlier test run, causing the configuration from the earlier
test to be re-used here.  We could try to completely disable this caching, but this could
have a large negative performance impact on Hadoop library code which assumes that FileSystem
creation is cheap.  I wonder if there's a way that we can clear this cache in between our
test runs, which would at least address the test-flakiness issues.

> InputOutputMetricsSuite "input metrics when reading text file with multiple splits" test
fails in branch-1.2 SBT Jenkins build w/hadoop1.0 and hadoop2.0 profiles
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-5227
>                 URL: https://issues.apache.org/jira/browse/SPARK-5227
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.2.1
>            Reporter: Josh Rosen
>            Priority: Blocker
>              Labels: flaky-test
>
> The InputOutputMetricsSuite " input metrics when reading text file with multiple splits"
test has been failing consistently in our new {{branch-1.2}} Jenkins SBT build: https://amplab.cs.berkeley.edu/jenkins/job/Spark-1.2-SBT/14/AMPLAB_JENKINS_BUILD_PROFILE=hadoop2.0,label=centos/testReport/junit/org.apache.spark.metrics/InputOutputMetricsSuite/input_metrics_when_reading_text_file_with_multiple_splits/
> Here's the error message
> {code}
> ArrayBuffer(32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
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32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
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32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
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32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 16) had length 3438 instead of expected
length 2
> {code}
> I can't reproduce this issue by running the test in isolation and it also seems to be
passing in the pull request builder.  I _was_ able to reproduce the error by modifying that
test to add a call to
> {code}
> sc.hadoopConfiguration.setLong("fs.local.block.size", 32)
> {code}
> It turns out that there's a call to this in WholeTextFileRecordReaderSuite and the execution
of that suite happens before the failing InputOutputMetricsSuite test.  I've looked through
the code and it doesn't look like we have any shared state between those test suites, so I
suspect that there could be some Hadoop bug in older versions that's impacting us here (such
as global shared state in a Hadoop class that's configured from the first test run and not
cleared for the second test).
> I don't have the cycles to fix this right now, but it would be great if a Hadoop expert
could take a look and see if they can come up with a workaround (or spot a bug in our code).




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