[jira] [Commented] (CASSANDRA-3150) ColumnFormatRecordReader loops forever

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-3150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099217#comment-13099217 ] 

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

The start==end check on 234 is a special case, because start==end is a wrapping Range.

The main "stop when we're done logic" is this:
{code}
                rows = client.get_range_slices(new ColumnParent(cfName),
                                               predicate,
                                               keyRange,
                                               consistencyLevel);
                  
                // nothing new? reached the end
                if (rows.isEmpty())
                {
                    rows = null;
                    return;
                }
{code}


> 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
>
>
> 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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