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Subject: Re: NullPointerException and Java client hang
From: Claire Chang <claire@merchantcircle.com>
In-Reply-To: <AANLkTi=pAr0mT=rAoKCcecn+quaNkSh0g4pKTmdny-VR@mail.gmail.com>
Date: Sat, 31 Jul 2010 19:46:33 -0700
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 <AANLkTi=pAr0mT=rAoKCcecn+quaNkSh0g4pKTmdny-VR@mail.gmail.com>
To: user@cassandra.apache.org

I was able to reproduce this exception consistently. Then I realized =
that in /etc/default/cassandra

JVM_START_MEM=3D"256"

It was set to 256 (Bytes). Before It was 128M. I changed it to 256M and =
made sure that the -Xmx and -Xms in casandra.in.sh and =
/etc/init.d/cassandra are all in sync.=20

After applying these changes, the exception no longer occurs in my 3 =
node cluster. BTW, my Xmx is set to 4G.

Hope this helps.

Claire
On Jul 30, 2010, at 1:05 PM, Peter Schuller wrote:

>> I am getting following exception:
>>=20
>> java.lang.NullPointerException
>>         at org.apache.cassandra.db.Table.apply(Table.java:407)
>=20
> Are you triggering this repeatedly without difficulty?
>=20
> Can you run with the attached patch (indentation is messed up in the
> patch though - sorry, no time to fix it now)? Hopefully it should emit
> (at level error) in the log a message indication it failed to obtain a
> column family store, followed by a list of all known column family
> stores, prior to bailing with the same exception.
>=20
> Is this happening on every node or just one? When did this start - did
> it start right after a schema change (keyspace addition)?
>=20
> (I'm just grasping at straws based on a cursory examination; I may be
> barking up the wrong tree completely.)
>=20
> --=20
> / Peter Schuller
> <cassandra-0.6.3-missingcfslog.patch>