SammiChen commented on HDFS-11643:

Double checked the issues reported by findbugs, asflicense and unit test. It 
seems all are irrelevant. 

> 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
> 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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