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From "Konstantin Boudnik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-644) Lease recovery, concurrency support.
Date Fri, 25 Sep 2009 23:20:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759803#action_12759803
] 

Konstantin Boudnik commented on HDFS-644:
-----------------------------------------

Bummer... Yes, you're right of course

> Lease recovery, concurrency support.
> ------------------------------------
>
>                 Key: HDFS-644
>                 URL: https://issues.apache.org/jira/browse/HDFS-644
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, hdfs client, name-node
>    Affects Versions: Append Branch
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: Append Branch
>
>         Attachments: leaseRecovery.patch
>
>
> Lease recovery happens if hdfs client does not renew its leases within an hour. Lease
recovery triggers block recovery if the block has not been completed during normal write or
append operations. Name-node initiates such block recovery by sending BlockRecoveryCommand
to data-nodes (via reply to a heartbeat). There could be a race condition if some data-nodes
still recover the block when the name-node decides to start a new recovery because the previous
one did not complete. This issue should take of the race condition by introducing recovery
ids. It should also implement the new recovery protocol, which is described in the append
design document,

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