hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3161) 20 Append: Excluded DN replica from recovery should be removed from DN.
Date Sun, 06 May 2012 20:45:48 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt Foley updated HDFS-3161:
-----------------------------

    Target Version/s: 1.1.0  (was: 1.0.3)
       Fix Version/s:     (was: 1.0.3)

No patch submitted in 1.0.3 timeframe.  If still intend to fix, please work in 1.1 context
(branch-1).  Thank you.
                
> 20 Append: Excluded DN replica from recovery should be removed from DN.
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3161
>                 URL: https://issues.apache.org/jira/browse/HDFS-3161
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: suja s
>            Priority: Critical
>
> 1) DN1->DN2->DN3 are in pipeline.
> 2) Client killed abruptly
> 3) one DN has restarted , say DN3
> 4) In DN3 info.wasRecoveredOnStartup() will be true
> 5) NN recovery triggered, DN3 skipped from recovery due to above check.
> 6) Now DN1, DN2 has blocks with generataion stamp 2 and DN3 has older generation stamp
say 1 and also DN3 still has this block entry in ongoingCreates
> 7) as part of recovery file has closed and got only two live replicas ( from DN1 and
DN2)
> 8) So, NN issued the command for replication. Now DN3 also has the replica with newer
generation stamp.
> 9) Now DN3 contains 2 replicas on disk. and one entry in ongoing creates with referring
to blocksBeingWritten directory.
> When we call append/ leaseRecovery, it may again skip this node for that recovery as
blockId entry still presents in ongoingCreates with startup recovery true.
> It may keep continue this dance for evry recovery.
> And this stale replica will not be cleaned untill we restart the cluster. Actual replica
will be trasferred to this node only through replication process.
> Also unnecessarily that replicated blocks will get invalidated after next recoveries....

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message