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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 Mon, 01 May 2017 20:18:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991459#comment-15991459
] 

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

Thanks for reviewing Wei-chiu,

Despite what downstreams may do, DFSClient is a private API, so we're allowed to change it.
However, good point about CreateFlag, we definitely should avoid adding new boolean parameters.
I missed this during my review. Sammi, could you update the patch? I think this only affects
the wire format, let's leave the builder API as-is. I left a comment on HADOOP-14365 about
a proposed enhancement for the flags.

> 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
>
>
> 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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