Hua Liu created HDFS-9901:
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Summary: Move block validation out of the heartbeat thread
Key: HDFS-9901
URL: https://issues.apache.org/jira/browse/HDFS-9901
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Reporter: Hua Liu
Assignee: Hua Liu
Priority: Minor
During heavy disk IO, we noticed hearbeat thread hangs on checkBlock method,
which checks the existence and length of a block before spins off a thread to
do the actual transferring. In extreme cases, the heartbeat thread hang more
than 10 minutes so the namenode marked the datanode as dead and started
replicating its blocks, which caused more disk IO on other nodes and can
potentially brought them down.
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