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https://issues.apache.org/jira/browse/HDFS-11643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15994194#comment-15994194
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Andrew Wang commented on HDFS-11643:
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Woops, I missed that, thanks Sammi. Still, given that just the TestBalancer
change works without the rest of the patch applied, we should do an explicit
check that the balancer's lock file is replicated and not EC. New tests should
exhibit "fail before, works after" behavior.
> Balancer fencing fails when writing erasure coded lock file
> -----------------------------------------------------------
>
> Key: HDFS-11643
> URL: https://issues.apache.org/jira/browse/HDFS-11643
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover, erasure-coding
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
> Assignee: SammiChen
> Priority: Blocker
> Labels: hdfs-ec-3.0-must-do
> Attachments: HDFS-11643.001.patch, HDFS-11643.002.patch,
> HDFS-11643.003.patch, HDFS-11643.004.patch, HDFS-11643.005.patch,
> HDFS-11643.006.patch, HDFS-11643.007.patch
>
>
> At startup, the balancer writes its hostname to the lock file and calls
> hflush(). hflush is not supported for EC files, so this fails when the entire
> filesystem is erasure coded.
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