Nate Putnam created HADOOP-9128:
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Summary: MetricsDynamicMBeanBase can cause high cpu load
Key: HADOOP-9128
URL: https://issues.apache.org/jira/browse/HADOOP-9128
Project: Hadoop Common
Issue Type: Bug
Components: metrics
Affects Versions: 0.20.2
Environment: cdh3u4
Reporter: Nate Putnam
I noticed high load on some of our Hadoop services. On closer inspection we
found several threads that were consuming cpu (80-90% of a core) doing :
java.lang.Thread.State: RUNNABLE
at java.util.HashMap.get(HashMap.java:303)
at
org.apache.hadoop.metrics.util.MetricsDynamicMBeanBase.getAttribute(MetricsDynamicMBeanBase.java:135)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)
This is a known issue in java when using a non thread safe hash map from
multiple threads.
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