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From "Eddie (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-2158) memtable_throughput_in_mb can not support sizes over 2.2 gigs because of an integer overflow.
Date Sun, 13 Feb 2011 06:55:57 GMT
memtable_throughput_in_mb can not support sizes over 2.2 gigs because of an integer overflow.
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                 Key: CASSANDRA-2158
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2158
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.7.0
            Reporter: Eddie


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;

    public Memtable(ColumnFamilyStore cfs)
    {

        this.cfs = cfs;
        creationTime = System.currentTimeMillis();
        this.THRESHOLD = cfs.getMemtableThroughputInMB() * 1024 * 1024;
        this.THRESHOLD_COUNT = (int) (cfs.getMemtableOperationsInMillions() * 1024 * 1024);
    }


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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