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Review request for hadoop-hdfs.
Summary
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Make exiting safemode a lot faster.
This addresses bug HDFS-1391.
https://issues.apache.org/jira/browse/HDFS-1391
Diffs
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http://svn.apache.org/repos/asf/hadoop/hdfs/trunk/src/java/org/apache/hadoop/hdfs/server/namenode/BlockManager.java
1053405
http://svn.apache.org/repos/asf/hadoop/hdfs/trunk/src/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
1053405
http://svn.apache.org/repos/asf/hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestOverReplicatedBlocks.java
1053405
Diff: https://reviews.apache.org/r/196/diff
Testing
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Running on our biggest production cluster of 3000 nodes since Dec 13th
Thanks,
Dhruba
