[jira] [Closed] (FLINK-2882) Improve performance of string conversions

["Fabian Hueske (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabian Hueske closed FLINK-2882.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 1.0.0

Fixed with b9ce8abb1bfc0cbc43e8c1800b4aeb7aee7c6e62

> 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
>             Fix For: 1.0.0
>
>
> {{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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