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Posted to issues@hbase.apache.org by "Anoop Sam John (JIRA)" <ji...@apache.org> on 2014/07/01 07:09:25 UTC

[jira] [Commented] (HBASE-11446) Reduce the frequency of RNG calls in SecureWALCellCodec#EncryptedKvEncoder

    [ https://issues.apache.org/jira/browse/HBASE-11446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14048518#comment-14048518 ] 

Anoop Sam John commented on HBASE-11446:
----------------------------------------

So the random IV is made once (in the life time of a the RS) and then onwards the IVs are predictable.

Code change looks good.

> Reduce the frequency of RNG calls in SecureWALCellCodec#EncryptedKvEncoder
> --------------------------------------------------------------------------
>
>                 Key: HBASE-11446
>                 URL: https://issues.apache.org/jira/browse/HBASE-11446
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>             Fix For: 0.99.0, 0.98.4
>
>         Attachments: HBASE-11446.patch
>
>
> By reducing the frequency of RNG calls in SecureWALCellCodec#EncryptedKvEncoder we can save 37% of on CPU time in that method and 3% of total on CPU time during an ingest test. WAL processing is a critical latency sensitive area.



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