[jira] [Comment Edited] (CASSANDRA-7245) Out-of-Order keys with stress + CQL3

["Pavel Yaskevich (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13999517#comment-13999517 ] 

Pavel Yaskevich edited comment on CASSANDRA-7245 at 5/16/14 1:41 AM:
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Jason told me that they idea was that it could only happen when there is an operation timeout but I'm not sure why almost every of 862 SSTables has such keys, when we only got total of 22 timeouts and there is no batching or anything, also it's not obvious why normal keys are getting sorted out of order too, also if the data is corrupted why the key is of correct size?...


was (Author: xedin):
Jason told me that they idea was that it could only happen when there is a operation timeout but I'm not sure what almost every of 862 SSTables has such keys when we only got 22 timeouts and there is no batching or something, also it's not obvious why normal keys are getting sorted out of order too, also if the data is corrupted why the key is of correct size?...

> 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
>
> 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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