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https://issues.apache.org/jira/browse/HDFS-10220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283237#comment-15283237
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Yongjun Zhang commented on HDFS-10220:
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I happen to see this jira now.
Hi [~daryn], do you suggest to dynamically adjust the lease check interval by
saying "if it broke out early then perhaps it could sleep for less than 2s"?
I agree with [~kihwal]'s "I don't think this kind of mass lease recoveries are
normal" comment. I wonder if we could just make both
MAX_LOCK_HOLD_TO_RELEASE_LEASE_MS and the lease check interval config
parameters instead of fixed numbers. If this config is there, it can solve the
abnormal situation. I know we have many configs already though. What do you
guys think?
Thanks.
> 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
> Priority: Minor
> 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, 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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