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From Subscriber <subscri...@zfabrik.de>
Subject Re: Cassandra node throws NPE on startup
Date Thu, 28 Apr 2011 14:56:16 GMT
Hi Aaron, 

what exactly do you mean?
I restarted the cluster by calling

	> bin/cassandra -p pid.file

on all three nodes. The first node is the (only) seed.

Udo


Am 27.04.2011 um 23:28 schrieb Aaron Morton:

> What approach did you take to restarting the cluster? 
> 
> It looks like the keyspace name was changed and the log replay tried to write to the
old one.
> 
> Aaron
> 
> On 28/04/2011, at 12:03 AM, Subscriber <subscriber@zfabrik.de> wrote:
> 
>> Hi again, 
>> 
>> some more remarks. 
>> I renamed the commitlog directory on the third node so that cassandra cannot see
it on startup. 
>> Now the node starts fine. The problem seems to have something to do with the commitlogs...
>> 
>> Best Regards
>> Udo
>> 
>> 
>> Am 27.04.2011 um 13:22 schrieb Subscriber:
>> 
>>> Hi, 
>>> 
>>> I'm using Cassandra 0.7.4 on a three node cluster. The cluster was setup yesterday
as a fresh installation (no upgrade).
>>> The cluster is installed beside a hadoop cluster (I want to discover how cassandra
works together with hadoop's map/reduce feature).
>>> 
>>> After loading some test data into the cassandra cluster (some text-files for
a first wordcount m/r example ;-) I killed all nodes and restarted the cluster.
>>> Two nodes are starting fine but the third node doesn't start and throws a NullPointerException:
>>> 
>>>  INFO 12:44:42,557 Finished reading /home/.../cassandra/work/commitlog/CommitLog-1303828029742.log
>>> ERROR 12:44:42,558 Exception encountered during startup.
>>> java.lang.NullPointerException
>>> 	at org.apache.cassandra.db.Table.createReplicationStrategy(Table.java:275)
>>> 	at org.apache.cassandra.db.Table.<init>(Table.java:221)
>>> 	at org.apache.cassandra.db.Table.open(Table.java:110)
>>> 	at org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:273)
>>> 	at org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:156)
>>> 	at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:173)
>>> 	at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:314)
>>> 	at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:79)
>>> Exception encountered during startup.
>>> 
>>> This looks pretty much the same as issue https://issues.apache.org/jira/browse/CASSANDRA-1889
which is in resolution "cannot reproduce".
>>> 
>>> What can I do to make the node starting again?
>>> 
>>> Thanks in advance and best regards
>>> Udo
>> 


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