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From "Stefania (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10529) Channel.size() is costly, mutually exclusive, and on the critical path
Date Wed, 14 Oct 2015 23:42:06 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14958021#comment-14958021
] 

Stefania commented on CASSANDRA-10529:
--------------------------------------

I mentioned it in the first bullet point of [this comment|https://issues.apache.org/jira/browse/CASSANDRA-10407?focusedCommentId=14943083&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14943083]
on CASSANDRA-10407.

> Channel.size() is costly, mutually exclusive, and on the critical path
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-10529
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10529
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Benedict
>             Fix For: 3.0.0 rc2
>
>
> [~stefania_alborghetti] mentioned this already on another ticket, but I have lost track
of exactly where. While benchmarking it became apparent this was a noticeable bottleneck for
small in-memory workloads with few files, especially with RF=1. We should probably fix this
soon, since it is trivial to do so, and the call is only to impose an assertion that our requested
length is less than the file size. It isn't possible to safely memoize a value anywhere we
can guarantee to be able to safely refer to it without some refactoring, so I suggest simply
removing the assertion for now.



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