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https://issues.apache.org/jira/browse/HADOOP-15598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16545546#comment-16545546
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Wei-Chiu Chuang edited comment on HADOOP-15598 at 7/16/18 6:35 PM:
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Pushed the patch to trunk, branch-3.1 and branch-3.0.
Thanks!
was (Author: jojochuang):
Pushed 002 patch to trunk, branch-3.1 and branch-3.0.
Thanks!
> 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, 3.1.1
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Major
> Fix For: 3.2.0, 3.1.1, 3.0.4
>
> 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,
> hadoop-sync-contention.svg
>
>
> When profiling a multi-threaded hive streaming ingest, observed lock
> contention on java.util.Properties getProperty() to check if os.arch 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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