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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-5863) In process (uncompressed) page cache
Date Tue, 03 May 2016 13:06:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15268655#comment-15268655
] 

T Jake Luciani edited comment on CASSANDRA-5863 at 5/3/16 1:05 PM:
-------------------------------------------------------------------

I committed in (my own patch) {{cfb9b9e7df94eec93aff43bf004a2e54872afe69}}


was (Author: tjake):
I committed in (my own patch) {{7c559def3422fe9e0edb161eeff85ae9ca853952}}

> In process (uncompressed) page cache
> ------------------------------------
>
>                 Key: CASSANDRA-5863
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5863
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: T Jake Luciani
>            Assignee: Branimir Lambov
>              Labels: performance
>             Fix For: 3.6
>
>
> Currently, for every read, the CRAR reads each compressed chunk into a byte[], sends
it to ICompressor, gets back another byte[] and verifies a checksum.  
> This process is where the majority of time is spent in a read request.  
> Before compression, we would have zero-copy of data and could respond directly from the
page-cache.
> It would be useful to have some kind of Chunk cache that could speed up this process
for hot data, possibly off heap.



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