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https://issues.apache.org/jira/browse/CASSANDRA-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120214#comment-13120214
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Jonathan Ellis commented on CASSANDRA-3306:
-------------------------------------------
Because then you get into hairy cyclical situations where you can't read the
manifest until you replay the commitlog, but replaying the commitlog requires
writing new sstables and thus knowing the manifest
> 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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