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https://issues.apache.org/jira/browse/HADOOP-15598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-15598:
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Status: Patch Available (was: Open)
> 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, 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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