[jira] Commented: (CASSANDRA-2158) memtable_throughput_in_mb can not support sizes over 2.2 gigs because of an integer overflow.

["Hudson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005921#comment-13005921 ] 

Hudson commented on CASSANDRA-2158:
-----------------------------------

Integrated in Cassandra-0.7 #376 (See [https://hudson.apache.org/hudson/job/Cassandra-0.7/376/])
    fix memtable thresholds better
patch by Erik Foralsrud; reviewed by jbellis for CASSANDRA-2158


> memtable_throughput_in_mb can not support sizes over 2.2 gigs because of an integer overflow.
> ---------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2158
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2158
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Eddie
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.7.4
>
>         Attachments: 2158.txt
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> If memtable_throughput_in_mb is set past 2.2 gigs, no errors are thrown.  However, as soon as data starts being written it is almost immediately being flushed.  Several hundred SSTables are created in minutes.  I am almost positive that the problem is that when memtable_throughput_in_mb is being converted into bytes the result is stored in an integer, which is overflowing.
> From memtable.java:
>     private final int THRESHOLD;
>     private final int THRESHOLD_COUNT;
> ...
> this.THRESHOLD = cfs.getMemtableThroughputInMB() * 1024 * 1024;
> this.THRESHOLD_COUNT = (int) (cfs.getMemtableOperationsInMillions() * 1024 * 1024);
> NOTE:
> I also think currentThroughput also needs to be changed from an int to a long.  I'm not sure if it is as simple as this or if this also is used in other places.

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