Prasanth Jayachandran created HADOOP-15598:

             Summary: DataChecksum calculate checksum is contented on hashtable 
                 Key: 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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