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From "Nicolas Fraison (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10220) Namenode failover due to too long loking in LeaseManager.Monitor
Date Sat, 02 Apr 2016 06:33:25 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Fraison updated HDFS-10220:
-----------------------------------
    Attachment: HADOOP-10220.003.patch

Thanks for the comments[Vinayakumar B]. Here is the new patch taking in account your comments.
[Ravi Prakash] there is one mistake in my previous comment we must consider if 1k files checked
is sufficiently safe for not iterating on the same leases (not on 1k leases).

> Namenode failover due to too long loking in LeaseManager.Monitor
> ----------------------------------------------------------------
>
>                 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
>            Priority: Minor
>         Attachments: HADOOP-10220.001.patch, HADOOP-10220.002.patch, HADOOP-10220.003.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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