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https://issues.apache.org/jira/browse/HDFS-644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HDFS-644:
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Attachment: leaseRecovery.patch
Forgot to turn on TestFileAppend2.
> 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, leaseRecovery.patch,
> 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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