Gopal Vijayaraghavan created HADOOP-16641:
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Summary: RPC: Heavy contention on
Configuration.getClassByNameOrNull
Key: HADOOP-16641
URL: https://issues.apache.org/jira/browse/HADOOP-16641
Project: Hadoop Common
Issue Type: Bug
Reporter: Gopal Vijayaraghavan
Attachments: config-get-class-by-name.png
https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java#L2589
{code}
map = Collections.synchronizedMap(
new WeakHashMap<String, WeakReference<Class<?>>>());
{code}
This synchronizes all lookups across the same class-loader across all threads &
yields rpc threads.
!config-get-class-by-name.png!
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