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From "Brandon Williams (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3306) Error in LeveledCompactionStrategy
Date Tue, 04 Oct 2011 16:04:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120241#comment-13120241
] 

Brandon Williams commented on CASSANDRA-3306:
---------------------------------------------

bq. why not store data in some system CF? would be probably safer choice.

This has historically been a bad idea, see CASSANDRA-1155, then CASSANDRA-1318 and finally
CASSANDRA-1430.
                
> 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
>            Priority: Critical
>
> 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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