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https://issues.apache.org/jira/browse/HADOOP-13351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15366930#comment-15366930
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Mingliang Liu commented on HADOOP-13351:
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Thanks for reporting this, [~fabbri]. I can remember my adding this UT. I
assign this to myself. Feel free to grab it if you have a plan to fix.
> TestDFSClientSocketSize buffer size tests are flaky
> ---------------------------------------------------
>
> Key: HADOOP-13351
> URL: https://issues.apache.org/jira/browse/HADOOP-13351
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.8.0, 3.0.0-alpha1
> Reporter: Aaron Fabbri
> Assignee: Mingliang Liu
>
> {{TestDFSClientSocketSize}} has two tests that assert that a value that was
> set via {{java.net.Socket#setSendBufferSize}} is equal to the value
> subsequently returned by {{java.net.Socket#getSendBufferSize}}.
> These tests are flaky when we run them. The occasionally fail.
> This is expected behavior, actually, because
> {{Socket#setSendBufferSize()}}[is only a
> hint|https://docs.oracle.com/javase/7/docs/api/java/net/Socket.html#setSendBufferSize(int)].
> (Similar to how the underlying libc {{setsockopt(SO_SNDBUF)}} works).
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