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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7245) Out-of-Order keys with stress + CQL3
Date Tue, 27 May 2014 21:19:03 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010285#comment-14010285
] 

Pavel Yaskevich commented on CASSANDRA-7245:
--------------------------------------------

It still leaves us with either 6861 or 5663, can you please generate with only 6861 reverted
to rule out 5663?

> Out-of-Order keys with stress + CQL3
> ------------------------------------
>
>                 Key: CASSANDRA-7245
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7245
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Pavel Yaskevich
>            Assignee: T Jake Luciani
>             Fix For: 2.1 rc1
>
>
> We have been generating data (stress with CQL3 prepared) for CASSANDRA-4718 and found
following problem almost in every SSTable generated (~200 GB of data and 821 SSTables).
> We set up they keys to be 10 bytes in size (default) and population between 1 and 600000000.
> Once I ran 'sstablekeys' on the generated SSTable files I got following exceptions:
> _There is a problem with sorting of normal looking keys:_
> 30303039443538353645
> 30303039443745364242
> java.io.IOException: Key out of order! DecoratedKey(-217680888487824985, *30303039443745364242*)
> DecoratedKey(-1767746583617597213, *30303039443437454333*)
> 00000a30303033343933
> 37344400001388343933
> java.io.IOException: Key out of order! DecoratedKey(5440473860101999581, *37344400001388343933*)
> DecoratedKey(-7565486415339257200, *30303033344639443137*)
> 30303033354244363031
> 30303033354133423742
> java.io.IOException: Key out of order! DecoratedKey(2687072396429900180, *30303033354133423742*)
> DecoratedKey(-7838239767410066684, *30303033354145344534*)
> 30303034313442354137
> 30343136353633340000
> java.io.IOException: Key out of order! DecoratedKey(1516003874415400462, *30343136353633340000*)
> DecoratedKey(-9106177395653818217, *30303034313333444238*)
> 30303035373044373435
> 30303035373044334631
> java.io.IOException: Key out of order! DecoratedKey(-3645715702154616540, *30303035373044334631*)
> DecoratedKey(-4296696226469000945, *30303035373132364138*)
> _And completely different ones:_
> 30303041333745373543
> 7cd045c59a90d7587d8d
> java.io.IOException: Key out of order! DecoratedKey(-3595402345023230196, *7cd045c59a90d7587d8d*)
> DecoratedKey(-5146766422778260690, *30303041333943303232*)
> 30303033323144444144
> 30303033323346343932
> java.io.IOException: Key out of order! DecoratedKey(7071845511166615635, *30303033323346343932*)
> DecoratedKey(5233296131921119414, *53d83e00000012287e03*)
> 30303034314531374431
> 3806734b256c27e41ec2
> java.io.IOException: Key out of order! DecoratedKey(-7720474642702543193, *3806734b256c27e41ec2*)
> DecoratedKey(-8072288379146044663, *30303034314136413343*)
> _And sometimes there is no problem at all:_
> 30303033353144463637
> 0000002a31b3b31a1c2f
> 5d616dd38211ebb5d6ec
> 44423645000013880000
> 00001388138844463744
> 30303033353143394343
> It's worth to mention that we have got 22 timeout exceptions but number of out-of-order
keys is much larger than that.



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