FSNamesystem#commitBlockSynchronization adds under-construction block locations
to blocksMap
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Key: HADOOP-5134
URL: https://issues.apache.org/jira/browse/HADOOP-5134
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.18.2
Reporter: Hairong Kuang
Fix For: 0.19.1
>From my understanding of sync/append design, an under construction block
>should not have any block locations associated with it in the blocksMap. So an
>under construction block will not be managed by ReplicationMonitor.
However, if there is an error in the write pipeline, a lease recovery will
trigger a call, commitBlockSynchronization, to NN. This call will add the
successfully-recovered datanodes to blocksMap. This seems to violate the
design. It should update the targets of the last block at INode instead.
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