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https://issues.apache.org/jira/browse/HDFS-14101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16700374#comment-16700374
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Zsolt Venczel commented on HDFS-14101:
--------------------------------------
Thanks [~kihwal] for reporting the issue!
DFSTestUtil.Builder creates files with random size no larger then 512 bytes and
no smaller then 1 byte.
{code}
DFSTestUtil util = new DFSTestUtil.Builder().
setName("testCorruptFilesCorruptedBlock").setNumFiles(2).
setMaxLevels(1).setMaxSize(512).build();
{code}
Whenever the file size is 1 byte the test fails as it tries to corrupt a block
by inserting a 2 bytes long buffer starting 2 bytes before the end of the file
that is -1.
The submitted patch should fix this (statistically this test had failed 1 times
per 512 run but it was running fine for 2000 runs having the patch).
> Random failure of testListCorruptFilesCorruptedBlock
> ----------------------------------------------------
>
> Key: HDFS-14101
> URL: https://issues.apache.org/jira/browse/HDFS-14101
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 3.2.0, 3.0.3, 2.8.5
> Reporter: Kihwal Lee
> Assignee: Zsolt Venczel
> Priority: Major
> Labels: newbie
> Attachments: HDFS-14101.01.patch
>
>
> We've seen this occasionally.
> {noformat}
> java.lang.IllegalArgumentException: Negative position
> at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:755)
> at org.apache.hadoop.hdfs.server.namenode.
>
> TestListCorruptFileBlocks.testListCorruptFilesCorruptedBlock(TestListCorruptFileBlocks.java:105)
> {noformat}
> The test has a flaw.
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