Lease recovery, concurrency support.
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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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