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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 Thu, 04 May 2017 18:38:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15997196#comment-15997196
] 

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

Fair enough. We should try revising this once HDFS-11644 goes in, since it offers a clean
way of querying the stream's capabilities without the additional RPC. I'll file a follow-on
JIRA.

Let's get this in, thanks Sammi! Will commit shortly.

> 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, HDFS-11643.008.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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