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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-11421) Eliminate allocations of byte array for UTF8 String serializations
Date Thu, 24 Mar 2016 16:48:25 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-11421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

T Jake Luciani updated CASSANDRA-11421:
---------------------------------------
    Issue Type: Sub-task  (was: Improvement)
        Parent: CASSANDRA-11428

> Eliminate allocations of byte array for UTF8 String serializations
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-11421
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11421
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Nitsan Wakart
>            Assignee: Nitsan Wakart
>
> When profiling a read workload (YCSB workload c) on Cassandra 3.2.1 I noticed a large
part of allocation profile was generated from String.getBytes() calls on CBUtil::writeString
> I have fixed up the code to use a thread local cached ByteBuffer and CharsetEncoder to
eliminate the allocations. This results in improved allocation profile, and a mild improvement
in performance.
> The fix is available here:
> https://github.com/nitsanw/cassandra/tree/fix-write-string-allocation



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