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Posted to issues@hbase.apache.org by "ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org> on 2014/05/22 14:02:02 UTC
[jira] [Commented] (HBASE-10974) Improve DBEs read performance by
avoiding byte array deep copies for key[] and value[]
[ https://issues.apache.org/jira/browse/HBASE-10974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14005849#comment-14005849 ]
ramkrishna.s.vasudevan commented on HBASE-10974:
------------------------------------------------
Can we have the existing way of comparison during gets and for scans take the new code. We could try creating an interface that gets instantiated based on get/scan.
> Improve DBEs read performance by avoiding byte array deep copies for key[] and value[]
> --------------------------------------------------------------------------------------
>
> Key: HBASE-10974
> URL: https://issues.apache.org/jira/browse/HBASE-10974
> Project: HBase
> Issue Type: Improvement
> Components: Scanners
> Affects Versions: 0.99.0
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 0.99.0
>
> Attachments: HBASE-10974_1.patch
>
>
> As part of HBASE-10801, we tried to reduce the copy of the value [] in forming the KV from the DBEs.
> The keys required copying and this was restricting us in using Cells and always wanted to copy to be done.
> The idea here is to replace the key byte[] as ByteBuffer and create a consecutive stream of the keys (currently the same byte[] is used and hence the copy). Use offset and length to track this key bytebuffer.
> The copy of the encoded format to normal Key format is definitely needed and can't be avoided but we could always avoid the deep copy of the bytes to form a KV and thus use cells effectively. Working on a patch, will post it soon.
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