Hi Sam, Thank you for the prompt reply! We will raise a ticket with Cassandra Jira.
In between I am posting here the Exception from the client too. The client is Python script running Python 2.7.12. ========================= Traceback (most recent call last): File "vssandra_v5.py", line 132, in <module> db.insert_batch() File "vssandra_v5.py", line 60, in insert_batch self.session.execute(self.batch, timeout=None) File "cassandra/cluster.py", line 1998, in cassandra.cluster.Session.execute (cassandra/cluster.c:34869) File "cassandra/cluster.py", line 3781, in cassandra.cluster.ResponseFuture.result (cassandra/cluster.c:73073) cassandra.protocol.ServerError: <Error from server: code=0000 [Server error] message="com.google.common.util.concurrent.UncheckedExecutionException: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException"> ========================== Kind regards, Rajesh Radhakrishnan ________________________________ From: [email protected] [[email protected]] on behalf of Sam Tunnicliffe [[email protected]] Sent: 23 September 2016 11:06 To: [email protected] Subject: Re: During writing data into Cassandra 3.7.0 using Python driver 3.7 sometime loose Connection because of Server NullPointerException (Help please!) The stacktrace suggests that when a connection is being established, either the can_login or is_superuser attribute of the authenticated role is null, which is definitely a bug as there should be no way to create a role in that state. Could you please open a ticket on https://issues.apache.org/jira/browse/CASSANDRA<redir.aspx?REF=SlQJ98hcbmjp6hop5VvKnm0suykq2Nbp6b7JnAAMTKBpqUsrmuPTCAFodHRwczovL2lzc3Vlcy5hcGFjaGUub3JnL2ppcmEvYnJvd3NlL0NBU1NBTkRSQQ..> (including as much detail as possible)? If you could reply back to this with the ticket # that'd be helpful for anyone coming across a similar issue in future. Thanks, Sam On Fri, Sep 23, 2016 at 10:33 AM, Rajesh Radhakrishnan <[email protected]<redir.aspx?REF=myOJeZj8usg7wTDmb3i2p8Q1KWlWRqUErdLxp1RgKNFpqUsrmuPTCAFtYWlsdG86UmFqZXNoLlJhZGhha3Jpc2huYW5AcGhlLmdvdi51aw..>> wrote: Hi, In one of our C* cluster we are using the latest Cassandra 3.7.0 (datastax-ddc.3.70) with Python driver 3.7. We are trying to insert 2 million row or more data into the database, it works but sometimes we are getting "Null pointer Exception". I am quoting the Exception here. Any help would be highly appreciated. We are using Python 2.7.11 and Java 1.8.0_73 in the Cassandra nodes and in the client its Python 2.7.12. ================================================================================================================== ERROR [SharedPool-Worker-6] 2016-09-23 09:42:55,002 Message.java:611 - Unexpected exception during request; channel = [id: 0xc208da86, L:/IP1.IP2.IP3.IP4:9042 - R:/IP5.IP6.IP7.IP8:58418] java.lang.NullPointerException: null at org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:33) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:24) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.db.marshal.AbstractType.compose(AbstractType.java:113) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.cql3.UntypedResultSet$Row.getBoolean(UntypedResultSet.java:273) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:85) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:81) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager.getRoleFromTable(CassandraRoleManager.java:503) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager.getRole(CassandraRoleManager.java:485) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager.canLogin(CassandraRoleManager.java:298) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.service.ClientState.login(ClientState.java:227) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:79) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:507) [apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:401) [apache-cassandra-3.7.0.jar:3.7.0] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.36.Final.jar:4.0.36.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292) [netty-all-4.0.36.Final.jar:4.0.36.Final] at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32) [netty-all-4.0.36.Final.jar:4.0.36.Final] at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:283) [netty-all-4.0.36.Final.jar:4.0.36.Final] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_73] at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164) [apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [apache-cassandra-3.7.0.jar:3.7.0] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_73] ERROR [SharedPool-Worker-1] 2016-09-23 09:42:56,238 Message.java:611 - Unexpected exception during request; channel = [id: 0x8e2eae00, L:/IP1.IP2.IP3.IP4:9042 - R:/IP5.IP6.IP7.IP8:58421] java.lang.NullPointerException: null at org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:33) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:24) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.db.marshal.AbstractType.compose(AbstractType.java:113) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.cql3.UntypedResultSet$Row.getBoolean(UntypedResultSet.java:273) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:85) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:81) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager.getRoleFromTable(CassandraRoleManager.java:503) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager.getRole(CassandraRoleManager.java:485) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.auth.CassandraRoleManager.canLogin(CassandraRoleManager.java:298) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.service.ClientState.login(ClientState.java:227) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:79) ~[apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:507) [apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:401) [apache-cassandra-3.7.0.jar:3.7.0] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.36.Final.jar:4.0.36.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292) [netty-all-4.0.36.Final.jar:4.0.36.Final] at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32) [netty-all-4.0.36.Final.jar:4.0.36.Final] at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:283) [netty-all-4.0.36.Final.jar:4.0.36.Final] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_73] at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164) [apache-cassandra-3.7.0.jar:3.7.0] at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [apache-cassandra-3.7.0.jar:3.7.0] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_73] ================================================================================================================== Thank you. 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