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https://issues.apache.org/jira/browse/FLINK-2882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15057957#comment-15057957
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ASF GitHub Bot commented on FLINK-2882:
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GitHub user greghogan opened a pull request:
https://github.com/apache/flink/pull/1455
[FLINK-2882] [core] Improve performance of string conversions
Memoize string representations of AbstractID.
Use lookup table for byte-to-hex conversion in StringUtils.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/greghogan/flink
2882_improve_performance_of_string_conversions
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1455.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1455
----
commit e23322855f94245783d7f0a5accb1558d2816152
Author: Greg Hogan <[email protected]>
Date: 2015-12-14T19:47:33Z
[FLINK-2882] [core] Improve performance of string conversions
Memoize string representations of AbstractID.
Use lookup table for byte-to-hex conversion in StringUtils.
----
> 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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