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https://issues.apache.org/jira/browse/CASSANDRA-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134226#comment-13134226
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Sylvain Lebresne commented on CASSANDRA-3306:
---------------------------------------------

Are you still able to reproduce reliably? Because we aren't and being able to 
would help considerably, so if you are and could share whatever script you're 
using to reproduce, that would be awesome.
                
> Error in LeveledCompactionStrategy
> ----------------------------------
>
>                 Key: CASSANDRA-3306
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3306
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Radim Kolar
>             Fix For: 1.0.1
>
>
> during stress testing, i always get this error making leveledcompaction 
> strategy unusable. Should be easy to reproduce - just write fast.
> ERROR [CompactionExecutor:6] 2011-10-04 15:48:52,179 
> AbstractCassandraDaemon.java (line 133) Fatal exception in thread 
> Thread[CompactionExecutor:6,5,main]
> java.lang.AssertionError
>       at 
> org.apache.cassandra.db.DataTracker$View.newSSTables(DataTracker.java:580)
>       at 
> org.apache.cassandra.db.DataTracker$View.replace(DataTracker.java:546)
>       at org.apache.cassandra.db.DataTracker.replace(DataTracker.java:268)
>       at 
> org.apache.cassandra.db.DataTracker.replaceCompactedSSTables(DataTracker.java:232)
>       at 
> org.apache.cassandra.db.ColumnFamilyStore.replaceCompactedSSTables(ColumnFamilyStore.java:960)
>       at 
> org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:199)
>       at 
> org.apache.cassandra.db.compaction.LeveledCompactionTask.execute(LeveledCompactionTask.java:47)
>       at 
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:131)
>       at 
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:114)
>       at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>       at java.lang.Thread.run(Thread.java:662)
> and this is in json data for table:
> {
>   "generations" : [ {
>     "generation" : 0,
>     "members" : [ 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 
> 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484 ]
>   }, {
>     "generation" : 1,
>     "members" : [ ]
>   }, {
>     "generation" : 2,
>     "members" : [ ]
>   }, {
>     "generation" : 3,
>     "members" : [ ]
>   }, {
>     "generation" : 4,
>     "members" : [ ]
>   }, {
>     "generation" : 5,
>     "members" : [ ]
>   }, {
>     "generation" : 6,
>     "members" : [ ]
>   }, {
>     "generation" : 7,
>     "members" : [ ]
>   } ]
> }

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