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From Rene Kochen <Rene.Koc...@emea.schange.com>
Subject java.io.IOError: java.io.EOFException with version 0.7.6
Date Thu, 19 May 2011 14:22:46 GMT
I have some severe problems on our production site.
I created the following test program to reproduce the issue with Cassandra 0.7.6 (with empty
data set).

I use the following data-model

column_metadata: []
name: Customers
column_type: Super
gc_grace_seconds: 60

I have a super-column-family with a single row.
Within this row I have a single super-column.
Within this super-column, I concurrently create, read and delete columns.

I have three threads:

- Do in a loop: add a column to the super-column.
- Do in a loop: delete a random column from the super-column.
- Do in a loop: read the super-column (with all columns).

After running the above threads concurrently, I always receive the following error:

ERROR 17:09:57,036 Fatal exception in thread Thread[ReadStage:81,5,main]
java.io.IOError: java.io.EOFException
        at org.apache.cassandra.io.util.ColumnIterator.deserializeNext(ColumnSortedMap.java:252)
        at org.apache.cassandra.io.util.ColumnIterator.next(ColumnSortedMap.java:268)
        at org.apache.cassandra.io.util.ColumnIterator.next(ColumnSortedMap.java:227)
        at java.util.concurrent.ConcurrentSkipListMap.buildFromSorted(Unknown Source)
        at java.util.concurrent.ConcurrentSkipListMap.<init>(Unknown Source)
        at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:379)
        at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:362)
        at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:322)
        at org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:79)
        at org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:40)
        at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
        at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
        at org.apache.cassandra.db.columniterator.SSTableSliceIterator.hasNext(SSTableSliceIterator.java:108)
        at org.apache.commons.collections.iterators.CollatingIterator.set(CollatingIterator.java:283)
        at org.apache.commons.collections.iterators.CollatingIterator.least(CollatingIterator.java:326)
        at org.apache.commons.collections.iterators.CollatingIterator.next(CollatingIterator.java:230)
        at org.apache.cassandra.utils.ReducingIterator.computeNext(ReducingIterator.java:69)
        at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
        at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
        at org.apache.cassandra.db.filter.SliceQueryFilter.collectReducedColumns(SliceQueryFilter.java:116)
        at org.apache.cassandra.db.filter.QueryFilter.collectCollatedColumns(QueryFilter.java:130)
        at org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1390)
        at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1267)
        at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1195)
        at org.apache.cassandra.db.Table.getRow(Table.java:324)
        at org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:63)
        at org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:451)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.io.EOFException
        at java.io.RandomAccessFile.readByte(Unknown Source)
        at org.apache.cassandra.utils.ByteBufferUtil.readShortLength(ByteBufferUtil.java:324)
        at org.apache.cassandra.utils.ByteBufferUtil.readWithShortLength(ByteBufferUtil.java:335)
        at org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:71)
        at org.apache.cassandra.io.util.ColumnIterator.deserializeNext(ColumnSortedMap.java:248)
        ... 30 more

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