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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5346) Replication queues should not be initialized in the middle of IBR processing.
Date Fri, 11 Oct 2013 16:43:50 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-5346:
-----------------------------

      Component/s: performance
                   namenode
    Fix Version/s: 0.23.10
                   2.3.0

> Replication queues should not be initialized in the middle of IBR processing.
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-5346
>                 URL: https://issues.apache.org/jira/browse/HDFS-5346
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode, performance
>    Affects Versions: 0.23.9, 2.3.0
>            Reporter: Kihwal Lee
>             Fix For: 2.3.0, 0.23.10
>
>
> When initial block reports are being processed, checkMode() is called from incrementSafeBlockCount().
This causes the replication queues to be initialized in the middle of processing a block report
in the IBR processing mode. If there are many block reports waiting to be processed, SafeModeMonitor
won't be able to make name node leave the safe mode soon. It appears that the block report
processing speed degrades considerably during this time. 



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