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Date: Mon, 22 Aug 2011 02:16:52 -0400
From: Dave Brosius <dbrosius@mebigfatguy.com>
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To: user@cassandra.apache.org
Subject: Recover from startup problems
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Greetings, I'm running head from source, and now when i try to start up 
the database, i get the following exception which causes client 
connection failures. I'm fine with blowing away the database, just 
playing, but wanted to know if there is a safe way to do this.

Exception encountered during startup.
java.lang.RuntimeException: error reading 1 of 3
     at 
org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:83)
     at 
org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:40)
     at 
com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:140)
     at 
com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:135)
     at 
org.apache.cassandra.db.columniterator.SSTableSliceIterator.hasNext(SSTableSliceIterator.java:107)
     at 
org.apache.cassandra.utils.MergeIterator$Candidate.advance(MergeIterator.java:194)
     at 
org.apache.cassandra.utils.MergeIterator.<init>(MergeIterator.java:47)
     at 
org.apache.cassandra.utils.MergeIterator$ManyToOne.<init>(MergeIterator.java:142)
     at org.apache.cassandra.utils.MergeIterator.get(MergeIterator.java:66)
     at 
org.apache.cassandra.db.filter.QueryFilter.collateColumns(QueryFilter.java:96)
     at 
org.apache.cassandra.db.CollationController.collectAllData(CollationController.java:221)
     at 
org.apache.cassandra.db.CollationController.getTopLevelColumns(CollationController.java:63)
     at 
org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1285)
     at 
org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1169)
     at 
org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1120)
     at org.apache.cassandra.db.DefsTable.loadFromStorage(DefsTable.java:83)
     at 
org.apache.cassandra.config.DatabaseDescriptor.loadSchemas(DatabaseDescriptor.java:507)
     at 
org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:159)
     at 
org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:335)
     at 
org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:91)
Caused by: java.nio.channels.ClosedChannelException
     at 
org.apache.cassandra.io.util.RandomAccessReader.read(RandomAccessReader.java:268)
     at java.io.RandomAccessFile.readByte(RandomAccessFile.java:589)
     at 
org.apache.cassandra.utils.ByteBufferUtil.readShortLength(ByteBufferUtil.java:356)
     at 
org.apache.cassandra.utils.ByteBufferUtil.readWithShortLength(ByteBufferUtil.java:367)
     at 
org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:87)
     at 
org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:82)
     at 
org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:72)
     at 
org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:36)
     at 
org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:79)