Wei-Chiu Chuang created HDFS-13393:
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Summary: Improve OOM logging
Key: HDFS-13393
URL: https://issues.apache.org/jira/browse/HDFS-13393
Project: Hadoop HDFS
Issue Type: Improvement
Components: balancer & mover, datanode
Reporter: Wei-Chiu Chuang
It is not uncommon to find "java.lang.OutOfMemoryError: unable to create new
native thread" error in a HDFS cluster. Most often this happens when DataNode
creating DataXceiver threads, or when balancer creates threads for moving
blocks around.
In most of cases, the "OOM" is a symptom of number of threads reaching system
limit, rather than actually running out of memory.
How about capturing the OOM, and if it is due to "unable to create new native
thread", print some more helpful message like "bump your ulimit" or "take a
jstack of the process"?
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