hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HDFS-4183) Throttle block recovery
Date Tue, 13 Nov 2012 02:15:15 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee reassigned HDFS-4183:
--------------------------------

    Assignee: Kihwal Lee
    
> Throttle block recovery
> -----------------------
>
>                 Key: HDFS-4183
>                 URL: https://issues.apache.org/jira/browse/HDFS-4183
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.23.4, 2.0.2-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>
> When a large number of files are abandoned without closing, a storm of lease expiration
follows in about an hour (lease hard limit). For the last block of each file, block recovery
is initiated and when the datanode is done, it calls commitBlockSynchronization() is called
against namenode. A burst of these calls can slow down namenode considerably. We need to throttle
block recovery and/or speed up the rate at which commitBlockSynchronization() is served.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message