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Posted to commits@cassandra.apache.org by "Nitsan Wakart (JIRA)" <ji...@apache.org> on 2016/03/24 10:34:25 UTC

[jira] [Created] (CASSANDRA-11421) Eliminate allocations of byte array for UTF8 String serializations

Nitsan Wakart created CASSANDRA-11421:
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             Summary: 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: Improvement
          Components: Core
            Reporter: 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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