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https://issues.apache.org/jira/browse/CASSANDRA-3150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113326#comment-13113326
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Mck SembWever edited comment on CASSANDRA-3150 at 9/23/11 12:05 PM:
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This is persisting to be a problem. And continuously gets worse through the day.
I can see like half my cf being read from one split.
It doesn't matter if it's ByteOrderingPartition or RandomPartitioner.
I've attached two screenshots from hadoop webpages (you see 36million map input
records when cassandra.input.split.size is set to 393216).
bq. ... double-check how many rows there really are in the given split range.
I can confirm that if i let these jobs run through to their completion (despite
how terribly long they may take) that the results are correct. It would seem
that the split ranges are incorrect (not the rows within in them).
was (Author: michaelsembwever):
This is persisting to be a problem. And continuously gets worse through the
day.
I can see like half my cf being read from one split.
It doesn't matter if it's ByteOrderingPartition or RandomPartitioner.
I've attached two screenshots from hadoop webpages (you see 36million map input
records when cassandra.input.split.size is set to 393216).
> ColumnFormatRecordReader loops forever (StorageService.getSplits(..) out of
> whack)
> ----------------------------------------------------------------------------------
>
> 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, Screenshot-Counters for
> task_201109212019_1060_m_000029 - Mozilla Firefox.png, Screenshot-Hadoop map
> task list for job_201109212019_1060 on cassandra01 - Mozilla Firefox.png,
> 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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