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Date: Wed, 11 Mar 2009 16:00:29 -0600
Message-ID: <e06563880903111500m4a9d8f54k9426695873733b20@mail.gmail.com>
Subject: Re: NPE in apache cassandra
From: Jonathan Ellis <jbellis@gmail.com>
To: cassandra-user@incubator.apache.org
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the config format changed.  now you need to specify the cfname as an attrib=
ute:

   	    <ColumnFamily Index=3D"Name" Name=3D"Standard1"/>

-Jonathan

On Wed, Mar 11, 2009 at 3:52 PM, Jiansheng Huang <jiansheng.wi@gmail.com> w=
rote:
>
>
> ---------- Forwarded message ----------
> From: Jiansheng Huang <jiansheng.wi@gmail.com>
> Date: Wed, Mar 11, 2009 at 2:49 PM
> Subject: NPE in apache cassandra
> To: cassandra-user@incubator.apache.org, Avinash Lakshman
> <alakshman@facebook.com>, Prashant Malik <pmalik@facebook.com>
> Cc: agupta@rocketfuelinc.com
>
>
> Hi folks, I checked out the new code from apache and compiled it. When I
> start up the server with a clean installation base (i.e., without using a=
ny
> system/user data from previous installation),
> I got the following.
>
> UNCAUGHT EXCEPTION IN main()
> java.lang.NullPointerException
> =A0=A0=A0 at java.io.DataOutputStream.writeUTF(DataOutputStream.java:347)
> =A0=A0=A0 at java.io.DataOutputStream.writeUTF(DataOutputStream.java:323)
> =A0=A0=A0 at
> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.jav=
a:254)
> =A0=A0=A0 at
> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.jav=
a:244)
> =A0=A0=A0 at org.apache.cassandra.db.Table$TableMetadata.apply(Table.java=
:209)
> =A0=A0=A0 at org.apache.cassandra.db.DBManager.storeMetadata(DBManager.ja=
va:150)
> =A0=A0=A0 at org.apache.cassandra.db.DBManager.<init>(DBManager.java:102)
> =A0=A0=A0 at org.apache.cassandra.db.DBManager.instance(DBManager.java:61=
)
> =A0=A0=A0 at
> org.apache.cassandra.service.StorageService.start(StorageService.java:465=
)
> =A0=A0=A0 at
> org.apache.cassandra.service.CassandraServer.start(CassandraServer.java:1=
10)
> =A0=A0=A0 at
> org.apache.cassandra.service.CassandraServer.main(CassandraServer.java:10=
78)
> Disconnected from the target VM, address: '127.0.0.1:45693', transport:
> 'socket'
>
> I did some debugging and found that in the following code, the first entr=
y
> in cfNames is always null. Is it safe to say that if cfName is null, then=
 we
> don't want to do the writings?
>
> public void serialize(TableMetadata tmetadata, DataOutputStream dos) thro=
ws
> IOException
> =A0=A0=A0=A0=A0=A0=A0 {
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 int size =3D tmetadata.cfIdMap_.size();
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 dos.writeInt(size);
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Set<String> cfNames =3D tmetadata.cfIdM=
ap_.keySet();
>
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 for ( String cfName : cfNames )
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 {
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 dos.writeUTF(cfName);
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 dos.writeInt( tmetadata.cfI=
dMap_.get(cfName).intValue() );
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 dos.writeUTF(tmetadata.getC=
olumnFamilyType(cfName));
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 }
> =A0=A0=A0=A0=A0=A0=A0 }
>
> A related question I have is what's the procedure for us to check in code=
? I
> have made some changes for adding latency counters in the server and
> exposing them through http. Would be good to check in the changes and min=
or
> fixes so that I don't have to risk of losing them ...
>
> Thanks,
>
> Jiansheng
>
>
>
>