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Posted to user@cassandra.apache.org by Jiansheng Huang <ji...@gmail.com> on 2009/03/11 22:52:00 UTC
Fwd: NPE in apache cassandra
---------- Forwarded message ----------
From: Jiansheng Huang <ji...@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 <pm...@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 any
system/user data from previous installation),
I got the following.
UNCAUGHT EXCEPTION IN main()
java.lang.NullPointerException
at java.io.DataOutputStream.writeUTF(DataOutputStream.java:347)
at java.io.DataOutputStream.writeUTF(DataOutputStream.java:323)
at
org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:254)
at
org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:244)
at org.apache.cassandra.db.Table$TableMetadata.apply(Table.java:209)
at org.apache.cassandra.db.DBManager.storeMetadata(DBManager.java:150)
at org.apache.cassandra.db.DBManager.<init>(DBManager.java:102)
at org.apache.cassandra.db.DBManager.instance(DBManager.java:61)
at
org.apache.cassandra.service.StorageService.start(StorageService.java:465)
at
org.apache.cassandra.service.CassandraServer.start(CassandraServer.java:110)
at
org.apache.cassandra.service.CassandraServer.main(CassandraServer.java:1078)
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 entry
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) throws
IOException
{
int size = tmetadata.cfIdMap_.size();
dos.writeInt(size);
Set<String> cfNames = tmetadata.cfIdMap_.keySet();
for ( String cfName : cfNames )
{
dos.writeUTF(cfName);
dos.writeInt( tmetadata.cfIdMap_.get(cfName).intValue() );
dos.writeUTF(tmetadata.getColumnFamilyType(cfName));
}
}
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 minor
fixes so that I don't have to risk of losing them ...
Thanks,
Jiansheng
Re: NPE in apache cassandra
Posted by Jiansheng Huang <ji...@gmail.com>.
Thanks Jonathan. The error is gone after I update the config.
On Wed, Mar 11, 2009 at 3:08 PM, Jonathan Ellis <jb...@gmail.com> wrote:
> Also, it will not work AT ALL with data from the old version. you
> need to start fresh.
>
> -Jonathan
>
> On Wed, Mar 11, 2009 at 4:00 PM, Jonathan Ellis <jb...@gmail.com> wrote:
> > the config format changed. now you need to specify the cfname as an
> attribute:
> >
> > <ColumnFamily Index="Name" Name="Standard1"/>
> >
> > -Jonathan
> >
> > On Wed, Mar 11, 2009 at 3:52 PM, Jiansheng Huang <ji...@gmail.com>
> wrote:
> >>
> >>
> >> ---------- Forwarded message ----------
> >> From: Jiansheng Huang <ji...@gmail.com>
> >> Date: Wed, Mar 11, 2009 at 2:49 PM
> >> Subject: NPE in apache cassandra
> >> To: cassandra-user@incubator.apache.org, Avinash Lakshman
> >> <al...@facebook.com>, Prashant Malik <pm...@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
> any
> >> system/user data from previous installation),
> >> I got the following.
> >>
> >> UNCAUGHT EXCEPTION IN main()
> >> java.lang.NullPointerException
> >> at java.io.DataOutputStream.writeUTF(DataOutputStream.java:347)
> >> at java.io.DataOutputStream.writeUTF(DataOutputStream.java:323)
> >> at
> >>
> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:254)
> >> at
> >>
> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:244)
> >> at org.apache.cassandra.db.Table$TableMetadata.apply(Table.java:209)
> >> at
> org.apache.cassandra.db.DBManager.storeMetadata(DBManager.java:150)
> >> at org.apache.cassandra.db.DBManager.<init>(DBManager.java:102)
> >> at org.apache.cassandra.db.DBManager.instance(DBManager.java:61)
> >> at
> >>
> org.apache.cassandra.service.StorageService.start(StorageService.java:465)
> >> at
> >>
> org.apache.cassandra.service.CassandraServer.start(CassandraServer.java:110)
> >> at
> >>
> org.apache.cassandra.service.CassandraServer.main(CassandraServer.java:1078)
> >> 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
> entry
> >> 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)
> throws
> >> IOException
> >> {
> >> int size = tmetadata.cfIdMap_.size();
> >> dos.writeInt(size);
> >> Set<String> cfNames = tmetadata.cfIdMap_.keySet();
> >>
> >> for ( String cfName : cfNames )
> >> {
> >> dos.writeUTF(cfName);
> >> dos.writeInt( tmetadata.cfIdMap_.get(cfName).intValue()
> );
> >> dos.writeUTF(tmetadata.getColumnFamilyType(cfName));
> >> }
> >> }
> >>
> >> 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
> minor
> >> fixes so that I don't have to risk of losing them ...
> >>
> >> Thanks,
> >>
> >> Jiansheng
> >>
> >>
> >>
> >>
> >
>
Re: NPE in apache cassandra
Posted by Jonathan Ellis <jb...@gmail.com>.
Also, it will not work AT ALL with data from the old version. you
need to start fresh.
-Jonathan
On Wed, Mar 11, 2009 at 4:00 PM, Jonathan Ellis <jb...@gmail.com> wrote:
> the config format changed. now you need to specify the cfname as an attribute:
>
> <ColumnFamily Index="Name" Name="Standard1"/>
>
> -Jonathan
>
> On Wed, Mar 11, 2009 at 3:52 PM, Jiansheng Huang <ji...@gmail.com> wrote:
>>
>>
>> ---------- Forwarded message ----------
>> From: Jiansheng Huang <ji...@gmail.com>
>> Date: Wed, Mar 11, 2009 at 2:49 PM
>> Subject: NPE in apache cassandra
>> To: cassandra-user@incubator.apache.org, Avinash Lakshman
>> <al...@facebook.com>, Prashant Malik <pm...@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 any
>> system/user data from previous installation),
>> I got the following.
>>
>> UNCAUGHT EXCEPTION IN main()
>> java.lang.NullPointerException
>> at java.io.DataOutputStream.writeUTF(DataOutputStream.java:347)
>> at java.io.DataOutputStream.writeUTF(DataOutputStream.java:323)
>> at
>> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:254)
>> at
>> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:244)
>> at org.apache.cassandra.db.Table$TableMetadata.apply(Table.java:209)
>> at org.apache.cassandra.db.DBManager.storeMetadata(DBManager.java:150)
>> at org.apache.cassandra.db.DBManager.<init>(DBManager.java:102)
>> at org.apache.cassandra.db.DBManager.instance(DBManager.java:61)
>> at
>> org.apache.cassandra.service.StorageService.start(StorageService.java:465)
>> at
>> org.apache.cassandra.service.CassandraServer.start(CassandraServer.java:110)
>> at
>> org.apache.cassandra.service.CassandraServer.main(CassandraServer.java:1078)
>> 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 entry
>> 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) throws
>> IOException
>> {
>> int size = tmetadata.cfIdMap_.size();
>> dos.writeInt(size);
>> Set<String> cfNames = tmetadata.cfIdMap_.keySet();
>>
>> for ( String cfName : cfNames )
>> {
>> dos.writeUTF(cfName);
>> dos.writeInt( tmetadata.cfIdMap_.get(cfName).intValue() );
>> dos.writeUTF(tmetadata.getColumnFamilyType(cfName));
>> }
>> }
>>
>> 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 minor
>> fixes so that I don't have to risk of losing them ...
>>
>> Thanks,
>>
>> Jiansheng
>>
>>
>>
>>
>
Re: NPE in apache cassandra
Posted by Jonathan Ellis <jb...@gmail.com>.
the config format changed. now you need to specify the cfname as an attribute:
<ColumnFamily Index="Name" Name="Standard1"/>
-Jonathan
On Wed, Mar 11, 2009 at 3:52 PM, Jiansheng Huang <ji...@gmail.com> wrote:
>
>
> ---------- Forwarded message ----------
> From: Jiansheng Huang <ji...@gmail.com>
> Date: Wed, Mar 11, 2009 at 2:49 PM
> Subject: NPE in apache cassandra
> To: cassandra-user@incubator.apache.org, Avinash Lakshman
> <al...@facebook.com>, Prashant Malik <pm...@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 any
> system/user data from previous installation),
> I got the following.
>
> UNCAUGHT EXCEPTION IN main()
> java.lang.NullPointerException
> at java.io.DataOutputStream.writeUTF(DataOutputStream.java:347)
> at java.io.DataOutputStream.writeUTF(DataOutputStream.java:323)
> at
> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:254)
> at
> org.apache.cassandra.db.Table$TableMetadataSerializer.serialize(Table.java:244)
> at org.apache.cassandra.db.Table$TableMetadata.apply(Table.java:209)
> at org.apache.cassandra.db.DBManager.storeMetadata(DBManager.java:150)
> at org.apache.cassandra.db.DBManager.<init>(DBManager.java:102)
> at org.apache.cassandra.db.DBManager.instance(DBManager.java:61)
> at
> org.apache.cassandra.service.StorageService.start(StorageService.java:465)
> at
> org.apache.cassandra.service.CassandraServer.start(CassandraServer.java:110)
> at
> org.apache.cassandra.service.CassandraServer.main(CassandraServer.java:1078)
> 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 entry
> 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) throws
> IOException
> {
> int size = tmetadata.cfIdMap_.size();
> dos.writeInt(size);
> Set<String> cfNames = tmetadata.cfIdMap_.keySet();
>
> for ( String cfName : cfNames )
> {
> dos.writeUTF(cfName);
> dos.writeInt( tmetadata.cfIdMap_.get(cfName).intValue() );
> dos.writeUTF(tmetadata.getColumnFamilyType(cfName));
> }
> }
>
> 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 minor
> fixes so that I don't have to risk of losing them ...
>
> Thanks,
>
> Jiansheng
>
>
>
>