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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3150) ColumnFormatRecordReader loops forever
Date Sat, 10 Sep 2011 18:53:09 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102109#comment-13102109
] 

Jonathan Ellis commented on CASSANDRA-3150:
-------------------------------------------

The index_interval dependency is this:

{code}
.
        for (DecoratedKey sample : cfs.allKeySamples())
        {
            if (range.contains(sample.token))
                keys.add(sample);
        }
        FBUtilities.sortSampledKeys(keys, range);
        int splits = keys.size() * DatabaseDescriptor.getIndexInterval() / keysPerSplit;
{code}

so, we're taking the size of the key samples (1/index_interval) and multiplying it by index_interval
to get an upper bound of the number of keys.  So it doesn't matter what you do with your interval
since it gets cancelled out.

> ColumnFormatRecordReader loops forever
> --------------------------------------
>
>                 Key: CASSANDRA-3150
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3150
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 0.8.4
>            Reporter: Mck SembWever
>            Assignee: Mck SembWever
>            Priority: Critical
>         Attachments: CASSANDRA-3150.patch, attempt_201109071357_0044_m_003040_0.grep-get_range_slices.log
>
>
> From http://thread.gmane.org/gmane.comp.db.cassandra.user/20039
> {quote}
> bq. Cassandra-0.8.4 w/ ByteOrderedPartitioner
> bq. CFIF's inputSplitSize=196608
> bq. 3 map tasks (from 4013) is still running after read 25 million rows.
> bq. Can this be a bug in StorageService.getSplits(..) ?
> getSplits looks pretty foolproof to me but I guess we'd need to add
> more debug logging to rule out a bug there for sure.
> I guess the main alternative would be a bug in the recordreader paging.
> {quote}

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