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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15598) DataChecksum calculate checksum is contented on hashtable synchronization
Date Wed, 11 Jul 2018 08:51:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth Jayachandran updated HADOOP-15598:
-------------------------------------------
    Summary: DataChecksum calculate checksum is contented on hashtable synchronization  (was:
DataChecksum calculate checksum is contented on hashtable lock)

> 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: Bug
>          Components: common
>    Affects Versions: 3.2.0
>            Reporter: Prasanth Jayachandran
>            Priority: Major
>         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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