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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5790) LeaseManager.findPath is very slow when many leases need recovery
Date Wed, 22 Jan 2014 02:13:22 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-5790:
------------------------------

    Attachment: hdfs-5790.txt

> LeaseManager.findPath is very slow when many leases need recovery
> -----------------------------------------------------------------
>
>                 Key: HDFS-5790
>                 URL: https://issues.apache.org/jira/browse/HDFS-5790
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode, performance
>    Affects Versions: 2.4.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-5790.txt, hdfs-5790.txt
>
>
> We recently saw an issue where the NN restarted while tens of thousands of files were
open. The NN then ended up spending multiple seconds for each commitBlockSynchronization()
call, spending most of its time inside LeaseManager.findPath(). findPath currently works by
looping over all files held for a given writer, and traversing the filesystem for each one.
This takes way too long when tens of thousands of files are open by a single writer.



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