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Posted to hdfs-dev@hadoop.apache.org by "Tsz Wo Nicholas Sze (JIRA)" <ji...@apache.org> on 2015/11/17 01:14:11 UTC
[jira] [Created] (HDFS-9434) Recommission a datanode with 500k
blocks may pause NN for 30 seconds
Tsz Wo Nicholas Sze created HDFS-9434:
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Summary: Recommission a datanode with 500k blocks may pause NN for 30 seconds
Key: HDFS-9434
URL: https://issues.apache.org/jira/browse/HDFS-9434
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
In BlockManager, processOverReplicatedBlocksOnReCommission is called within the namespace lock. There is a (not very useful) log message printed in processOverReplicatedBlock. When there is a large number of blocks stored in a storage, printing the log message for each block can pause NN to process any other operations. We did see that it could pause NN for 30 seconds for a storage with 500k blocks.
I suggest to change the log message to trace level as a quick fix.
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