0.20: in tryUpdateBlock, the meta file is renamed away before genstamp
validation is done
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Key: HDFS-1263
URL: https://issues.apache.org/jira/browse/HDFS-1263
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.20-append
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Fix For: 0.20-append
Saw an issue where multiple datanodes are trying to recover at the same time,
and all of them failed. I think the issue is in FSDataset.tryUpdateBlock, we do
the rename of blk_B_OldGS to blk_B_OldGS_tmpNewGS and *then* check that the
generation stamp is moving upwards. Because of this, invalid update block calls
are blocked, but they then cause future updateBlock calls to fail with "Meta
file not found" errors.
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