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From "Jackson Chung (Reopened) (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (CASSANDRA-2930) corrupt commitlog
Date Tue, 13 Dec 2011 18:40:30 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jackson Chung reopened CASSANDRA-2930:
--------------------------------------

      Assignee: Rick Branson

we have seen this again on 0.8.7, same stacktrace and reasoning (col count off by 1). 

may deserve a 2nd look to see how we could end up at this stage.
                
> corrupt commitlog
> -----------------
>
>                 Key: CASSANDRA-2930
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2930
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.8.1
>         Environment: Linux, amd64.
> Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
>            Reporter: ivan
>            Assignee: Rick Branson
>         Attachments: CommitLog-1310637513214.log
>
>
> We get "Exception encountered during startup" error while Cassandra starts.
> Error messages:
>  INFO 13:56:28,736 Finished reading /var/lib/cassandra/commitlog/CommitLog-1310637513214.log
> ERROR 13:56:28,736 Exception encountered during startup.
> java.io.IOError: java.io.EOFException
>         at org.apache.cassandra.io.util.ColumnIterator.deserializeNext(ColumnSortedMap.java:265)
>         at org.apache.cassandra.io.util.ColumnIterator.next(ColumnSortedMap.java:281)
>         at org.apache.cassandra.io.util.ColumnIterator.next(ColumnSortedMap.java:236)
>         at java.util.concurrent.ConcurrentSkipListMap.buildFromSorted(ConcurrentSkipListMap.java:1493)
>         at java.util.concurrent.ConcurrentSkipListMap.<init>(ConcurrentSkipListMap.java:1443)
>         at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:419)
>         at org.apache.cassandra.db.ColumnFamilySerializer.deserializeColumns(ColumnFamilySerializer.java:139)
>         at org.apache.cassandra.db.ColumnFamilySerializer.deserialize(ColumnFamilySerializer.java:127)
>         at org.apache.cassandra.db.RowMutation$RowMutationSerializer.deserialize(RowMutation.java:382)
>         at org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:278)
>         at org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:158)
>         at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:175)
>         at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:368)
>         at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:80)
> Caused by: java.io.EOFException
>         at java.io.DataInputStream.readFully(DataInputStream.java:180)
>         at java.io.DataInputStream.readFully(DataInputStream.java:152)
>         at org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:394)
>         at org.apache.cassandra.utils.ByteBufferUtil.readWithShortLength(ByteBufferUtil.java:368)
>         at org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:87)
>         at org.apache.cassandra.io.util.ColumnIterator.deserializeNext(ColumnSortedMap.java:261)
>         ... 13 more
> Exception encountered during startup.
> java.io.IOError: java.io.EOFException
>         at org.apache.cassandra.io.util.ColumnIterator.deserializeNext(ColumnSortedMap.java:265)
>         at org.apache.cassandra.io.util.ColumnIterator.next(ColumnSortedMap.java:281)
>         at org.apache.cassandra.io.util.ColumnIterator.next(ColumnSortedMap.java:236)
>         at java.util.concurrent.ConcurrentSkipListMap.buildFromSorted(ConcurrentSkipListMap.java:1493)
>         at java.util.concurrent.ConcurrentSkipListMap.<init>(ConcurrentSkipListMap.java:1443)
>         at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:419)
>         at org.apache.cassandra.db.ColumnFamilySerializer.deserializeColumns(ColumnFamilySerializer.java:139)
>         at org.apache.cassandra.db.ColumnFamilySerializer.deserialize(ColumnFamilySerializer.java:127)
>         at org.apache.cassandra.db.RowMutation$RowMutationSerializer.deserialize(RowMutation.java:382)
>         at org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:278)
>         at org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:158)
>         at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:175)
>         at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:368)
>         at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:80)
> Caused by: java.io.EOFException
>         at java.io.DataInputStream.readFully(DataInputStream.java:180)
>         at java.io.DataInputStream.readFully(DataInputStream.java:152)
>         at org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:394)
>         at org.apache.cassandra.utils.ByteBufferUtil.readWithShortLength(ByteBufferUtil.java:368)
>         at org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:87)
>         at org.apache.cassandra.io.util.ColumnIterator.deserializeNext(ColumnSortedMap.java:261)
>         ... 13 more
> After some debugging I found that in some serialized supercolumns column counter is less
than the number of serialized columns. Difference was always 1 in corrupt commitlogs. This
error always appears with supercolumns with more than one column, but there are properly serialized
supercolumns also in commitlog.
> I have no clue yet why this error happens. I suspect it maybe a race condition.

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