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From "Arya Goudarzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4206) AssertionError: originally calculated column size of 629444349 but now it is 588008950
Date Wed, 21 Aug 2013 21:12:55 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13746850#comment-13746850
] 

Arya Goudarzi commented on CASSANDRA-4206:
------------------------------------------

I don't remember which bug but there was one bug where Johnathan and Sylvain were arguing
about discrepancy of column calculation logic in various places in the code which depended
on gc_grace, deleted columns, etc. I took that as a hint and applied it to my scenario. I
increased the gc_grace for the CF in question to a large number like 1 year. Then ran user
defined compactions and they happily ran. Afther that I change the gc_grace setting back to
10 days and ran compactions again and my tombsones got cleaned up without seeing that exception.
So, although, it didn't make sense to me what happened exactly, but at least this could be
worth a try for those who are stuck.
                
> AssertionError: originally calculated column size of 629444349 but now it is 588008950
> --------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4206
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4206
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.0.9
>         Environment: Debian Squeeze Linux, kernel 2.6.32, sun-java6-bin 6.26-0squeeze1
>            Reporter: Patrik Modesto
>
> I've 4 node cluster of Cassandra 1.0.9. There is a rfTest3 keyspace with RF=3 and one
CF with two secondary indexes. I'm importing data into this CF using Hadoop Mapreduce job,
each row has less than 10 colkumns. From JMX:
> MaxRowSize:  1597
> MeanRowSize: 369
> And there are some tens of millions of rows.
> It's write-heavy usage and there is a big pressure on each node, there are quite some
dropped mutations on each node. After ~12 hours of inserting I see these assertion exceptiona
on 3 out of four nodes:
> {noformat}
> ERROR 06:25:40,124 Fatal exception in thread Thread[HintedHandoff:1,1,main]
> java.lang.RuntimeException: java.util.concurrent.ExecutionException:
> java.lang.AssertionError: originally calculated column size of 629444349 but now it is
588008950
>        at org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpointInternal(HintedHandOffManager.java:388)
>        at org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpoint(HintedHandOffManager.java:256)
>        at org.apache.cassandra.db.HintedHandOffManager.access$300(HintedHandOffManager.java:84)
>        at org.apache.cassandra.db.HintedHandOffManager$3.runMayThrow(HintedHandOffManager.java:437)
>        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>        at java.lang.Thread.run(Thread.java:662)
> Caused by: java.util.concurrent.ExecutionException:
> java.lang.AssertionError: originally calculated column size of
> 629444349 but now it is 588008950
>        at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
>        at java.util.concurrent.FutureTask.get(FutureTask.java:83)
>        at org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpointInternal(HintedHandOffManager.java:384)
>        ... 7 more
> Caused by: java.lang.AssertionError: originally calculated column size
> of 629444349 but now it is 588008950
>        at org.apache.cassandra.db.compaction.LazilyCompactedRow.write(LazilyCompactedRow.java:124)
>        at org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:160)
>        at org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:161)
>        at org.apache.cassandra.db.compaction.CompactionManager$7.call(CompactionManager.java:380)
>        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>        ... 3 more
> {noformat}
> Few lines regarding Hints from the output.log:
> {noformat}
>  INFO 06:21:26,202 Compacting large row system/HintsColumnFamily:70000000000000000000000000000000
(1712834057 bytes) incrementally
>  INFO 06:22:52,610 Compacting large row system/HintsColumnFamily:10000000000000000000000000000000
(2616073981 bytes) incrementally
>  INFO 06:22:59,111 flushing high-traffic column family CFS(Keyspace='system', ColumnFamily='HintsColumnFamily')
(estimated 305147360 bytes)
>  INFO 06:22:59,813 Enqueuing flush of Memtable-HintsColumnFamily@833933926(3814342/305147360
serialized/live bytes, 7452 ops)
>  INFO 06:22:59,814 Writing Memtable-HintsColumnFamily@833933926(3814342/305147360 serialized/live
bytes, 7452 ops)
> {noformat}
> I think the problem may be somehow connected to an IntegerType secondary index. I had
a different problem with CF with two secondary indexes, the first UTF8Type, the second IntegerType.
After a few hours of inserting data in the afternoon and midnight repair+compact, the next
day I couldn't find any row using the IntegerType secondary index. The output was like this:
> {noformat}
> [default@rfTest3] get IndexTest where col1 = '3230727:http://zaskolak.cz/download.php';
> -------------------
> RowKey: 3230727:8383582:http://zaskolak.cz/download.php
> => (column=col1, value=3230727:http://zaskolak.cz/download.php, timestamp=1335348630332000)
> => (column=col2, value=8383582, timestamp=1335348630332000)
> -------------------
> RowKey: 3230727:8383583:http://zaskolak.cz/download.php
> => (column=col1, value=3230727:http://zaskolak.cz/download.php, timestamp=1335348449078000)
> => (column=col2, value=8383583, timestamp=1335348449078000)
> -------------------
> RowKey: 3230727:8383579:http://zaskolak.cz/download.php
> => (column=col1, value=3230727:http://zaskolak.cz/download.php, timestamp=1335348778577000)
> => (column=col2, value=8383579, timestamp=1335348778577000)
> 3 Rows Returned.
> Elapsed time: 292 msec(s).
> [default@rfTest3] get IndexTest where col2 = 8383583;
> 0 Row Returned.
> Elapsed time: 7 msec(s
> {noformat}
> You can see there really is an 8383583 in col2 in on of the listed rows, but the search
by secondary index returns nothing.
> The Assert Exception also happend only on CF with the secondary index of IntegerType.
There were also secondary indexes of UTF8Type and
> LongType types. It's the first time I've tried secondary indexes of other type than UTF8Type.
> Regards,
> Patrik

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