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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2982) Startup performance suffers when there are many edit log segments
Date Fri, 18 May 2012 07:15:19 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-2982:
---------------------------------------

    Attachment: HDFS-2982.002.patch

* EditLogInputStream#init: use IOUtils.cleanup

* edit log validation: stop validating at the earliest unreadable txid (i.e., the old behavior.)
 The new behavior can be introduced by HDFS-3049.

* JournalSet#selectInputStreams: improve doxygen

* remove readAllEdits since it's deadcode (it belongs with HDFS-3049)
                
> Startup performance suffers when there are many edit log segments
> -----------------------------------------------------------------
>
>                 Key: HDFS-2982
>                 URL: https://issues.apache.org/jira/browse/HDFS-2982
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Colin Patrick McCabe
>            Priority: Critical
>         Attachments: HDFS-2982.001.patch, HDFS-2982.002.patch
>
>
> For every one of the edit log segments, it seems like we are calling listFiles on the
edit log directory inside of {{findMaxTransaction}}. This is killing performance, especially
when there are many log segments and the directory is stored on NFS. It is taking several
minutes to start up the NN when there are several thousand log segments present.

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