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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7929) inotify unable fetch pre-upgrade edit log segments once upgrade starts
Date Wed, 27 May 2015 00:09:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14560184#comment-14560184
] 

Colin Patrick McCabe commented on HDFS-7929:
--------------------------------------------

The time needed to copy over the edit logs can cause performance problems in some clusters.
 HDFS-8480 will fix this by using hardlinking instead.

> inotify unable fetch pre-upgrade edit log segments once upgrade starts
> ----------------------------------------------------------------------
>
>                 Key: HDFS-7929
>                 URL: https://issues.apache.org/jira/browse/HDFS-7929
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7929-000.patch, HDFS-7929-001.patch, HDFS-7929-002.patch, HDFS-7929-003.patch
>
>
> inotify is often used to periodically poll HDFS events. However, once an HDFS upgrade
has started, edit logs are moved to /previous on the NN, which is not accessible. Moreover,
once the upgrade is finalized /previous is currently lost forever.



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