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https://issues.apache.org/jira/browse/HADOOP-15598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540233#comment-16540233
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Steve Loughran commented on HADOOP-15598:
-----------------------------------------
looks good, but we'll wait for Yetus to do a test run. Jenkins has been playing
up today, so I'll reattach and resubmit.
> DataChecksum calculate checksum is contented on hashtable synchronization
> -------------------------------------------------------------------------
>
> Key: HADOOP-15598
> URL: https://issues.apache.org/jira/browse/HADOOP-15598
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Affects Versions: 3.2.0
> Reporter: Prasanth Jayachandran
> Priority: Minor
> Attachments: HADOOP-15598.1.patch, Screen Shot 2018-07-11 at 1.45.06
> AM.png, Screen Shot 2018-07-11 at 2.01.54 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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