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Posted to issues@hbase.apache.org by "Tudor Scurtu (Updated) (JIRA)" <ji...@apache.org> on 2012/04/02 16:29:25 UTC
[jira] [Updated] (HBASE-5625) Avoid byte buffer allocations when
reading a value from a Result object
[ https://issues.apache.org/jira/browse/HBASE-5625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tudor Scurtu updated HBASE-5625:
--------------------------------
Attachment: 5625v5.txt
@Zhihong:
Thanks for the review request. I actually had to make my own in order to upload the diff: https://reviews.apache.org/r/4607/
The performance actually depends on the system capabilities. It's hard to write a microbenchmark test for an issue that manifests itself on large I/O intensive jobs that put a lot of gc pressure. I implemented a few of Cosmin's suggestions.
> Avoid byte buffer allocations when reading a value from a Result object
> -----------------------------------------------------------------------
>
> Key: HBASE-5625
> URL: https://issues.apache.org/jira/browse/HBASE-5625
> Project: HBase
> Issue Type: Improvement
> Components: client
> Affects Versions: 0.92.1
> Reporter: Tudor Scurtu
> Assignee: Tudor Scurtu
> Labels: patch
> Attachments: 5625.txt, 5625v2.txt, 5625v3.txt, 5625v4.txt, 5625v5.txt
>
>
> When calling Result.getValue(), an extra dummy KeyValue and its associated underlying byte array are allocated, as well as a persistent buffer that will contain the returned value.
> These can be avoided by reusing a static array for the dummy object and by passing a ByteBuffer object as a value destination buffer to the read method.
> The current functionality is maintained, and we have added a separate method call stack that employs the described changes. I will provide more details with the patch.
> Running tests with a profiler, the reduction of read time seems to be of up to 40%.
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