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From "Ravi Prakash (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10220) A large number of expired leases can make namenode unresponsive and cause failover
Date Wed, 08 Jun 2016 20:37:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15321399#comment-15321399
] 

Ravi Prakash commented on HDFS-10220:
-------------------------------------

Awesome! Patch looks good to me too. Will commit shortly. Thanks for the patch Nicolas, and
for the reviews Kihwal, Arpit, Yongjun, Daryn, Walter, Mingliang and Vinaykumar!

> A large number of expired leases can make namenode unresponsive and cause failover
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-10220
>                 URL: https://issues.apache.org/jira/browse/HDFS-10220
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Nicolas Fraison
>            Assignee: Nicolas Fraison
>         Attachments: HADOOP-10220.001.patch, HADOOP-10220.002.patch, HADOOP-10220.003.patch,
HADOOP-10220.004.patch, HADOOP-10220.005.patch, HADOOP-10220.006.patch, HADOOP-10220.007.patch,
threaddump_zkfc.txt
>
>
> I have faced a namenode failover due to unresponsive namenode detected by the zkfc with
lot's of WARN messages (5 millions) like this one:
> _org.apache.hadoop.hdfs.StateChange: BLOCK* internalReleaseLease: All existing blocks
are COMPLETE, lease removed, file closed._
> On the threaddump taken by the zkfc there are lots of thread blocked due to a lock.
> Looking at the code, there are a lock taken by the LeaseManager.Monitor when some lease
must be released. Due to the really big number of lease to be released the namenode has taken
too many times to release them blocking all other tasks and making the zkfc thinking that
the namenode was not available/stuck.
> The idea of this patch is to limit the number of leased released each time we check for
lease so the lock won't be taken for a too long time period.



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