Pavel Yaskevich created CASSANDRA-7245:
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Summary: 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 get following
exceptions:
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)
There is also 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)
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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