[
https://issues.apache.org/jira/browse/MAPREDUCE-5987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14074157#comment-14074157
]
Binglin Chang commented on MAPREDUCE-5987:
------------------------------------------
Hi Sean, I use valgrind to check TestGlibCBug, and find some bugs, one of them
is causing TestGlibCBug to fail on ubuntu, create d MAPREDUCE-6005 for this.
About TestGlibCBug, I suspect the real cause is bug in ReadBuffer::fillGet, in
which I used memcpy rather than memmove to move a range of bytes from buffer
end to buffer beginning, the two ranges may overlap, according to the man page
of memcpy:
bq. If dst and src overlap, behavior is undefined. Applications in which dst
and src might overlap should use memmove(3) instead.
So the bytes in the buffer may be corrupted. I think that is why it the test
fails, it is not related to some glibc bug.
> native-task: Unit test TestGlibCBug fails on ubuntu
> ---------------------------------------------------
>
> Key: MAPREDUCE-5987
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5987
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: task
> Reporter: Sean Zhong
> Assignee: Sean Zhong
> Priority: Minor
>
> On ubuntu12, glibc: 2.15-0ubuntu10.3, UT TestGlibCBug fails
> [ RUN ] IFile.TestGlibCBug
> 14/07/21 15:55:30 INFO TestGlibCBug ./testData/testGlibCBugSpill.out
> /home/decster/projects/hadoop-trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/native/test/TestIFile.cc:186:
> Failure
> Value of: realKey
> Actual: 1127504685
> Expected: expect[index]
> Which is: 4102672832
> [ FAILED ] IFile.TestGlibCBug (0 ms)
> [----------] 2 tests from IFile (240 ms total)
--
This message was sent by Atlassian JIRA
(v6.2#6252)
