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https://issues.apache.org/jira/browse/CASSANDRA-5799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721745#comment-13721745
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Eric Falcao commented on CASSANDRA-5799:
----------------------------------------

I was excited to see this fix in 1.2.7 but I fear it's still an issue. Here is 
a stack I just saw in my freshly upgraded 1.2.7 cluster:

{code}
ERROR [CompactionExecutor:17] 2013-07-27 17:24:31,132 CassandraDaemon.java 
(line 192) Exception in thread Thread[CompactionExecutor:17,1,RMI Runtime]
java.lang.AssertionError: originally calculated column size of 516898177 but 
now it is 516898234
        at 
org.apache.cassandra.db.compaction.LazilyCompactedRow.write(LazilyCompactedRow.java:135)
        at 
org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:160)
        at 
org.apache.cassandra.db.compaction.CompactionTask.runWith(CompactionTask.java:162)
        at 
org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48)
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
        at 
org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:58)
        at 
org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:60)
        at 
org.apache.cassandra.db.compaction.CompactionManager$6.runMayThrow(CompactionManager.java:355)
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)
{code}

Does it matter that my SSTables are mostly on version ic?

FWIW, I've been unable to compact this CF since we went to C* 1.2. I'll attach 
other JIRAs that may be related.

                
> Column can expire while lazy compacting it...
> ---------------------------------------------
>
>                 Key: CASSANDRA-5799
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5799
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.2.6
>            Reporter: Fabien Rousseau
>            Assignee: Sylvain Lebresne
>             Fix For: 1.2.7
>
>         Attachments: 5799.txt
>
>
> Using TTL + range tombstones can lead to failure while lazy compacting rows.
> Scenario to reproduce :
>  - create an SSTable with one row and some columns and a TTL of 8 seconds
>  - wait one second
>  - create a second SSTable with the same rowkey as above, and add a range 
> tombstone
>  - start the first pass of the lazy compaction before the columns with TTL 
> are expired
>  - wait 10 seconds (enough for columns with TTL to expire)
>  - continue lazy expiration
>  - the following assertion will fail :
>     [junit] junit.framework.AssertionFailedError: originally calculated 
> column size of 1379 but now it is 1082
>     [junit]   at 
> org.apache.cassandra.db.compaction.LazilyCompactedRow.write(LazilyCompactedRow.java:150)

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