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

["Greg Hogan (JIRA)" <ji...@apache.org>]

Greg Hogan created FLINK-2882:
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             Summary: 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
            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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