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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4233) overlapping sstables in leveled compaction strategy
Date Fri, 11 May 2012 15:32:50 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273351#comment-13273351
] 

Sylvain Lebresne commented on CASSANDRA-4233:
---------------------------------------------

So it's not (only) a problem of overlapping sstables in a given level, since extracted from
the log above we get:
{noformat}
DEBUG [CompactionExecutor:4] 2012-05-11 15:04:39,125 LeveledManifest.java (line 273) Compaction
candidates for L0 are Standard1-4(L0), Standard1-3(L0), Standard1-2(L1), 
 INFO [CompactionExecutor:4] 2012-05-11 15:04:39,126 CompactionTask.java (line 109) Compacting
[SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1/Keyspace1-Standard1-hd-4-Data.db'),
SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1/Keyspace1-Standard1-hd-3-Data.db'),
SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1/Keyspace1-Standard1-hd-2-Data.db')]
ERROR [CompactionExecutor:4] 2012-05-11 15:04:41,829 AbstractCassandraDaemon.java (line 134)
Exception in thread Thread[CompactionExecutor:4,1,main]
java.lang.AssertionError: Last written key DecoratedKey(170030165514395172434635544532010976042,
30303033313634) >= current key DecoratedKey(983360854569225448206418564333137310, 30303036353031)
writing into /var/lib/cassandra/data/Keyspace1/Standard1/Keyspace1-Standard1-tmp-hd-6-Data.db
{noformat}
That is, we get an error even though we compact 2 L0 with 1 L1.
                
> overlapping sstables in leveled compaction strategy
> ---------------------------------------------------
>
>                 Key: CASSANDRA-4233
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4233
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>         Attachments: 4233-assert.txt, system.log.bz2
>
>
> CASSANDRA-4142 introduces test failures, that are caused by overlapping tables within
a level, which Shouldn't Happen.

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