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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11643) Balancer fencing fails when writing erasure coded lock file
Date Wed, 03 May 2017 02:47:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15994194#comment-15994194
] 

Andrew Wang commented on HDFS-11643:
------------------------------------

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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