[jira] [Updated] (CASSANDRA-2850) Converting bytes to hex string is unnecessarily slow

["David Allsopp (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-2850?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Allsopp updated CASSANDRA-2850:
-------------------------------------

    Attachment: BytesToHexBenchmark.java

> Converting bytes to hex string is unnecessarily slow
> ----------------------------------------------------
>
>                 Key: CASSANDRA-2850
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2850
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.8.1
>            Reporter: David Allsopp
>            Priority: Minor
>             Fix For: 0.8.2
>
>         Attachments: BytesToHexBenchmark.java, cassandra-2850.diff
>
>
> ByteBufferUtil.bytesToHex() is unnecessarily slow - it doesn't pre-size the StringBuilder (so several re-sizes will be needed behind the scenes) and it makes quite a few method calls per byte.
> (OK, this may be a premature optimisation, but I couldn't resist, and it's a small change)
> Will attach patch shortly that speeds it up by about x3, plus benchmarking test.

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