Prasanth Jayachandran created HADOOP-15598:
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Summary: DataChecksum calculate checksum is contented on hashtable
lock
Key: HADOOP-15598
URL: https://issues.apache.org/jira/browse/HADOOP-15598
Project: Hadoop Common
Issue Type: Bug
Components: common
Affects Versions: 3.2.0
Reporter: Prasanth Jayachandran
Attachments: Screen Shot 2018-07-11 at 1.45.06 AM.png
When profiling a multi-threaded hive streaming ingest, observed lock contention
on java.util.Properties getProperty() to check if os is "sparc".
java.util.Properties internally uses HashTable. HashTable.get() is synchronized
method. In the test application, on a 30s profile with 64 threads ~40% CPU time
is spent on getProperty() contention. See attached snapshot.
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