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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4000) Division by zero on get_slice
Date Tue, 06 Mar 2012 18:05:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223481#comment-13223481
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Jonathan Ellis commented on CASSANDRA-4000:
-------------------------------------------

+1, although we might want to query for 2*count instead of count+1 in the no-live-columns
case, since if all count columns were dead the odds seem pretty good that just one more column
won't help.
                
> Division by zero on get_slice
> -----------------------------
>
>                 Key: CASSANDRA-4000
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4000
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.0.8
>         Environment: We start getting this exception after upgrading from 1.0.1 ->
1.0.8.
> 4 nodes cluster on Cassandra v1.0.8. RF = 3. 
> Hector v0.8.0-3.
>            Reporter: Sergey B
>            Assignee: Sylvain Lebresne
>             Fix For: 1.0.9
>
>         Attachments: 4000.txt
>
>
> We have a column family with String row keys and Long column keys.
> Our WideEntityService is trying to get the first column in the range from 0 to Long.MAX.
It's a batch operation performed for every row in the CF (rows count is approximately tens
of thousands and each row contains from 0 to 1000 columns). 
> After processing each row we are removing some of the columns we have queried. Also,
at the same time we are writing in this CF in another threads but somewhat less intensive.
> An error rises approximately for a one of 100 rows.
> Exception itself:
> [05-Mar-2012 18:47:25,247] ERROR [http-8095-1 WideEntityServiceImpl.java:142] - get:
key1 - {type=RANGE, start=0, end=9223372036854775807, orderDesc=false, limit=1}
> me.prettyprint.hector.api.exceptions.HCassandraInternalException: Cassandra encountered
an internal error processing this request: TApplicationError type: 6 message:Internal error
processing get_slice
>         at me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:31)
>         at me.prettyprint.cassandra.service.KeyspaceServiceImpl$7.execute(KeyspaceServiceImpl.java:285)
>         at me.prettyprint.cassandra.service.KeyspaceServiceImpl$7.execute(KeyspaceServiceImpl.java:268)
>         at me.prettyprint.cassandra.service.Operation.executeAndSetResult(Operation.java:101)
>         at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:233)
>         at me.prettyprint.cassandra.service.KeyspaceServiceImpl.operateWithFailover(KeyspaceServiceImpl.java:131)
>         at me.prettyprint.cassandra.service.KeyspaceServiceImpl.getSlice(KeyspaceServiceImpl.java:289)
>         at me.prettyprint.cassandra.model.thrift.ThriftSliceQuery$1.doInKeyspace(ThriftSliceQuery.java:53)
>         at me.prettyprint.cassandra.model.thrift.ThriftSliceQuery$1.doInKeyspace(ThriftSliceQuery.java:49)
>         at me.prettyprint.cassandra.model.KeyspaceOperationCallback.doInKeyspaceAndMeasure(KeyspaceOperationCallback.java:20)
>         at me.prettyprint.cassandra.model.ExecutingKeyspace.doExecute(ExecutingKeyspace.java:85)
>         at me.prettyprint.cassandra.model.thrift.ThriftSliceQuery.execute(ThriftSliceQuery.java:48)

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