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https://issues.apache.org/jira/browse/CASSANDRA-3175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102749#comment-13102749
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Vijay commented on CASSANDRA-3175:
----------------------------------
Sasha, This may be happening when at least one node's gossip is not received
from the other node which is the 172.16.14.x network.... Which means you might
want to see if the connection from all of the nodes in 14.x network to 12.x
network is working as expected.
"How does Cassandra determine the NAME of the node of each Data Center? Where
does it get this information?"
the way EC2Snitch works is by adding the gossip (application state) to the node
and letting the nodes discover the Rack/DC information by gossiping, if we dont
know any one nodes information then this ex will occur.
> Ec2Snitch nodetool issue after upgrade to 0.8.5
> -----------------------------------------------
>
> Key: CASSANDRA-3175
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3175
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.8.5
> Environment: Amazon Ec2 with 4 nodes in region ap-southeast. 2 in
> 1a, 2 in 1b
> Reporter: Sasha Dolgy
> Assignee: Vijay
> Priority: Minor
> Labels: ec2snitch, nodetool
> Fix For: 0.8.6
>
>
> Upgraded one ring that has four nodes from 0.8.0 to 0.8.5 with only one minor
> problem. It relates to Ec2Snitch when running a 'nodetool ring' from two of
> the four nodes. the rest are all working fine:
> Address DC Rack Status State Load Owns Token
> 148362247927262972740864614603570725035
> 172.16.12.11 ap-southeast1a Up Normal 1.58 MB 24.02%
> 19095547144942516281182777765338228798
> 172.16.12.10 ap-southeast1a Up Normal 1.63 MB 22.11%
> 56713727820156410577229101238628035242
> 172.16.14.10 ap-southeast1b Up Normal 1.85 MB 33.33%
> 113427455640312821154458202477256070484
> 172.16.14.12 ap-southeast1b Up Normal 1.36 MB 20.53%
> 14836224792726297274086461460357072503
> works ... on 2 nodes which happen to be on the 172.16.14.0/24 network.
> the nodes where the error appears are on the 172.16.12.0/24 network and this
> is what is shown when nodetool ring is run:
> Address DC Rack Status State Load Owns Token
> 148362247927262972740864614603570725035
> 172.16.12.11 ap-southeast1a Up Normal 1.58 MB 24.02%
> 19095547144942516281182777765338228798
> 172.16.12.10 ap-southeast1a Up Normal 1.62 MB 22.11%
> 56713727820156410577229101238628035242
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.cassandra.locator.Ec2Snitch.getDatacenter(Ec2Snitch.java:93)
> at
> org.apache.cassandra.locator.DynamicEndpointSnitch.getDatacenter(DynamicEndpointSnitch.java:122)
> at
> org.apache.cassandra.locator.EndpointSnitchInfo.getDatacenter(EndpointSnitchInfo.java:49)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:93)
> at
> com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:27)
> at
> com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:208)
> at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:120)
> at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:262)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836)
> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761)
> at
> javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1427)
> at
> javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72)
> at
> javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1265)
> at
> javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1360)
> at
> javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:788)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
> at sun.rmi.transport.Transport$1.run(Transport.java:159)
> at java.security.AccessController.doPrivileged(Native Method)
> at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
> at
> sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
> at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
> at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> I've stopped the node and started it ... still doesn't make a difference.
> I've also shut down all nodes in the ring so that it was fully offline, and
> then brought them all back up ... issue still persists on two of the nodes.
> There are no firewall rules restricting traffic between these nodes. For
> example, on a node where the ring throws the exception, the two hosts that
> don't show up i can still get nestats for:
> nodetool -h 172.16.12.11 -p 9090 netstats 172.16.14.10
> Mode: Normal
> Nothing streaming to /172.16.14.10
> Nothing streaming from /172.16.14.10
> Pool Name Active Pending Completed
> Commands n/a 0 3
> Responses n/a 1 1483
> nodetool -h 172.16.12.11 -p 9090 netstats 172.16.14.12
> Mode: Normal
> Nothing streaming to /172.16.14.12
> Nothing streaming from /172.16.14.12
> Pool Name Active Pending Completed
> Commands n/a 0 3
> Responses n/a 0 1784
> Problem only looks to appear via nodetool, and doesn't seem to be impacting
> anything else.
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