commitBlockSynchronization() should directly update block GS and length.
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Key: HDFS-736
URL: https://issues.apache.org/jira/browse/HDFS-736
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.21.0
Reporter: Konstantin Shvachko
Assignee: Konstantin Shvachko
Fix For: 0.21.0
{{FSNamesystem.commitBlockSynchronization()}} updates block's generation stamp
and length by first removing the old block instance from blocksMap and then
inserting the new instance back. This was necessary when GS was a part of the
block key. After HDFS-512 the GS along with the block length can be updated
directly in the blocksMap entry.
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