[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

["Lianhui Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-5227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14312163#comment-14312163 ] 

Lianhui Wang commented on SPARK-5227:
-------------------------------------

split size in hadoop's  FileInputFormat:
protected long computeSplitSize(long goalSize, long minSize,
                                       long blockSize) {
    return Math.max(minSize, Math.min(goalSize, blockSize));
  }
long goalSize = totalSize / (numSplits == 0 ? 1 : numSplits);
and minSize = 1
blockSize = getConf().getLong("fs.local.block.size", 32 * 1024 * 1024);
so when numSplits=2 and totalSize is very large, then goalSize > blockSize. if it is true, actual splitSize is blockSize, not goalSize.
In this situation, the error in this PR will be happened.

> 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, 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, 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, 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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, 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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