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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11915) Sync rbw dir on the first hsync() to avoid file lost on power failure
Date Thu, 11 Jan 2018 17:24:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322577#comment-16322577

Wei-Chiu Chuang commented on HDFS-11915:

+1 except for the checkstyle warning. I can fix that when committing the patch.

> Sync rbw dir on the first hsync() to avoid file lost on power failure
> ---------------------------------------------------------------------
>                 Key: HDFS-11915
>                 URL: https://issues.apache.org/jira/browse/HDFS-11915
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kanaka Kumar Avvaru
>            Assignee: Vinayakumar B
>            Priority: Critical
>             Fix For: 3.1.0
>         Attachments: HDFS-11915-01.patch, HDFS-11915-branch-2-01.patch, HDFS-11915-branch-2-02.patch
> As discussed in HDFS-5042, there is a chance to lose blocks on power failure if rbw file
creation entry is not yet sync to device. Then the block created is nowhere exists on disk.
Neither in rbw nor in finalized. 
> As suggested by [~kihwal], will discuss and track it in this JIRA.
> As suggested by [~vinayrpet], May be first hsync() request on block file can call fsync
on its parent directory (rbw) directory.

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