DataNode : idle rebalancing threads need not take up threads.
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Key: HADOOP-4116
URL: https://issues.apache.org/jira/browse/HADOOP-4116
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Affects Versions: 0.17.0
Reporter: Raghu Angadi
The number of threads are currently limited on datanodes. Once these threads
are occupied, DataNode does not accept any more requests (DOS). Recently we saw
a case where most of the 256 threads were waiting in
{{DataXceiver.replaceBlock()}} trying to acquire {{balancingSem}}. Since
rebalancing is (heavily) throttled, I would think this would be the common
case.
These waiting threads need not take up a thread.
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