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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-644) Lease recovery, concurrency support.
Date Tue, 22 Sep 2009 23:30:17 GMT
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

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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