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Posted to hdfs-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2010/09/11 02:05:32 UTC

[jira] Created: (HDFS-1391) Exiting safemode takes a long time when there are lots of blocks in the HDFS

Exiting safemode takes a long time when there are lots of blocks in the HDFS
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                 Key: HDFS-1391
                 URL: https://issues.apache.org/jira/browse/HDFS-1391
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur


When the namenode decides to exit safemode,  it acquires the FSNamesystem lock and then iterates over all blocks in the blocksmap to determine if any block has any excess replicas. This call takes upwards of 5 minutes on a cluster that has 100 million blocks. This delays namenode restart to a good extent.

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