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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2882) Improve performance of string conversions
Date Tue, 15 Dec 2015 20:37:46 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15058749#comment-15058749
] 

ASF GitHub Bot commented on FLINK-2882:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/1455


> Improve performance of string conversions
> -----------------------------------------
>
>                 Key: FLINK-2882
>                 URL: https://issues.apache.org/jira/browse/FLINK-2882
>             Project: Flink
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.10.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>
> {{AbstractID.toString()}} and {{AbstractID.toShortString()}} call {{StringUtils.byteToHexString(...)}}
which uses a StringBuilder to convert from binary to hex. This is a hotspot when scaling the
number of workers.
> While testing on my single node with parallelism=512 jvisualvm reports 600,000 calls
taking 13.4 seconds. Improving {{StringUtils.byteToHexString(...)}} reduces the time to 1.3
seconds. Additionally memoizing the string values in {{AbstractID}} reduce the time to 350
ms and the number of calls to {{StringUtils.byteToHexString(...)}} to ~1000.



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