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From: Jonathan Ellis <jbellis@gmail.com>
Date: Wed, 24 Mar 2010 09:32:49 -0500
Message-ID: <e06563881003240732n13bb4407i4f60a4e84330b531@mail.gmail.com>
Subject: Re: NullPointerException in DatabaseDescriptor.getComparator
To: user@cassandra.apache.org
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probably 0.5.1 is allowing an invalid query and erroring out when it
actually runs it.  0.6 beta3 should catch the problem earlier.

On Wed, Mar 24, 2010 at 9:28 AM, Oleg M=FCrk <oleg.myrk@gmail.com> wrote:
> Hello,
> I am having the following problem with Cassandra. When I first start
> Cassandra, it works fine and I insert some data, but when I kill cassandr=
a
> and then start it again, it starts throwing NullPointerException (into
> log4j). When I restart Cassandra once more, it doesn't throw the exceptio=
n
> (usually), but when I query for previously inserted data, it is gone.
> I am using out-of-the box Cassandra 0.5.1 on a single node (Java 6 / OS X
> 10.5.8). My schema is as follows:
> ------------------------------------------------
> =A0=A0 =A0<Keyspace Name=3D"zclosure">
> =A0=A0 =A0 =A0<KeysCachedFraction>0.01</KeysCachedFraction>
> =A0=A0 =A0 =A0<ColumnFamily CompareWith=3D"UTF8Type" Name=3D"url-item"/>
> =A0=A0 =A0 =A0<ColumnFamily CompareWith=3D"UTF8Type" Name=3D"url-item-hea=
ders"/>
> =A0=A0 =A0</Keyspace>
> ------------------------------------------------
> and the exception log is below.=A0Any ideas?
> Thank You,
> Oleg M=FCrk
> -----------------------------------------------
> .......
> INFO - Log replay complete
> INFO - Saved Token found: 93658780503831948900522797887764765383
> INFO - Starting up server gossip
> DEBUG - Starting to listen on localhost/127.0.0.1
> DEBUG - Binding thrift service to localhost/127.0.0.1:9160
> INFO - Cassandra starting up...
> DEBUG - Disseminating load info ...
> DEBUG - get_count
> DEBUG - get_slice
> DEBUG - strongread reading data for SliceFromReadCommand(table=3D'zclosur=
e',
> key=3D'http://paulgraham.com/kate.html',
> column_parent=3D'QueryPath(columnFamilyName=3D'url-item',
> superColumnName=3D'null', col
> umnName=3D'null')', start=3D'', finish=3D'', reversed=3Dfalse, count=3D21=
47483647)
> from 29@localhost/127.0.0.1
> ERROR - Error in ThreadPoolExecutor
> java.lang.NullPointerException
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.config.DatabaseDescriptor.getComparator(DatabaseDesc=
riptor.java:914)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.io.SSTableReader.getColumnComparator(SSTableReader.j=
ava:414)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.filter.SSTableSliceIterator.<init>(SSTableSliceIt=
erator.java:54)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.filter.SliceQueryFilter.getSSTableColumnIterator(=
SliceQueryFilter.java:63)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamilyInternal(ColumnF=
amilyStore.java:1245)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilySto=
re.java:1203)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilySto=
re.java:1172)
> =A0=A0 =A0 =A0 =A0at org.apache.cassandra.db.Table.getRow(Table.java:415)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.=
java:59)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ReadVerbHandler.doVerb(ReadVerbHandler.java:79)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java=
:38)
> =A0=A0 =A0 =A0 =A0at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor=
.java:886)
> =A0=A0 =A0 =A0 =A0at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav=
a:908)
> =A0=A0 =A0 =A0 =A0at java.lang.Thread.run(Thread.java:637)
> ERROR - Fatal exception in thread Thread[ROW-READ-STAGE:1,5,main]
> java.lang.NullPointerException
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.config.DatabaseDescriptor.getComparator(DatabaseDesc=
riptor.java:914)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.io.SSTableReader.getColumnComparator(SSTableReader.j=
ava:414)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.filter.SSTableSliceIterator.<init>(SSTableSliceIt=
erator.java:54)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.filter.SliceQueryFilter.getSSTableColumnIterator(=
SliceQueryFilter.java:63)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamilyInternal(ColumnF=
amilyStore.java:1245)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilySto=
re.java:1203)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilySto=
re.java:1172)
> =A0=A0 =A0 =A0 =A0at org.apache.cassandra.db.Table.getRow(Table.java:415)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.=
java:59)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.db.ReadVerbHandler.doVerb(ReadVerbHandler.java:79)
> =A0=A0 =A0 =A0 =A0at
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java=
:38)
> =A0=A0 =A0 =A0 =A0at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor=
.java:886)
> =A0=A0 =A0 =A0 =A0at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav=
a:908)
> =A0=A0 =A0 =A0 =A0at java.lang.Thread.run(Thread.java:637)
>