FAQ
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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postedSep 11, '10 at 12:06a
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