Had a look at the code, and this might be a race-condition like problem at the function StorageService::checkForEndpointCollision and StorageService::prepareReplacementInfo

 

To do a Gossiper.instance.doShadowRound(), the MessagingService.instance().listen(FBUtilities.getLocalAddress()) must be FULLY (accepting connections) running.

However , the listen function is starting SocketThread threads, but is not waiting for these to be started. So I think, at least in theory,  that the doShadowRound function will be sending messages, thus excepting answers, but there is no guarantee that the listeners are actually up and running.

 

As a test I modified the MessagingService::listen code by

SocketThread th = new SocketThread(ss, "ACCEPT-" + localEp);

   synchronized( th ) {

     th.start();

     try { th.wait(); } catch(Throwable tt){}

   }

 

And the SocketThread::run function

public void run()

   {

     synchronized( this ) {

       this.notifyAll();

     }

 

That way there is little chance the socket thread is not running yet (should be blocked in the server.accept call() ).

 

 

Regards,

Ignace Desimpel

 

From: Desimpel, Ignace [mailto:Ignace.Desimpel@nuance.com]
Sent: donderdag 6 februari 2014 12:15
To: user@cassandra.apache.org
Subject: Sporadic gossip exception on add node

 

Environment : linux, cassandra 2.0.4, 3 node, embedded, byte ordered, LCS

 

When I add a node to the existing 3 node cluster I sometimes get the exception ‘Unable to gossip with any seeds ‘ listed below. If I just restart it without any change then mostly it works. Must be some timing issue.

 

The Cassandra at that time is configured using the Cassandra.yaml file

with the auto_bootstrap set true

and the initial_token set to something like : 00f35256, 041e692a, 0562d8b2, 0930274a, 0b16ce96, 0c5b3e1e, 10cac47a, 12b16bc6, 13f5db4e, 186561aa, 1907996e, 1c32b042, 1e19578e ……

 

The two seeds configured in this yaml are 10.164.8.250 and 10.164.8.249 and these are up and running.

The new node to add has ip 10.164.8.93

 

At the time of the exception, I do not get the gossip message ‘Handshaking version with /10.164.8.93’ on the seeds.

If the exception does not occurs, then I do get that gossip message ‘Handshaking version with /10.164.8.93’ on the seed

 

2014-01-31 13:40:36.380 Loading persisted ring state

2014-01-31 13:40:36.386 Starting Messaging Service on port 9804

2014-01-31 13:40:36.408 Handshaking version with /10.164.8.250

2014-01-31 13:40:36.408 Handshaking version with /10.164.8.249

2014-01-31 13:41:07.415 Exception encountered during startup

java.lang.RuntimeException: Unable to gossip with any seeds

                at org.apache.cassandra.gms.Gossiper.doShadowRound(Gossiper.java:1160) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:426) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:618) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.StorageService.initServer(StorageService.java:586) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.StorageService.initServer(StorageService.java:485) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:346) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:461) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at be.landc.services.search.server.db.baseserver.indexsearch.store.cassandra.CassandraStore$CassThread.startUpCassandra(CassandraStore.java:469) [landc-services-search-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT-87937]

                at be.landc.services.search.server.db.baseserver.indexsearch.store.cassandra.CassandraStore$CassThread.run(CassandraStore.java:460) [landc-services-search-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT-87937]

java.lang.RuntimeException: Unable to gossip with any seeds

                at org.apache.cassandra.gms.Gossiper.doShadowRound(Gossiper.java:1160)

                at org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:426)

                at org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:618)

                at org.apache.cassandra.service.StorageService.initServer(StorageService.java:586)

                at org.apache.cassandra.service.StorageService.initServer(StorageService.java:485)

                at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:346)

                at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:461)

                at be.landc.services.search.server.db.baseserver.indexsearch.store.cassandra.CassandraStore$CassThread.startUpCassandra(CassandraStore.java:469)

                at be.landc.services.search.server.db.baseserver.indexsearch.store.cassandra.CassandraStore$CassThread.run(CassandraStore.java:460)

Exception encountered during startup: Unable to gossip with any seeds

2014-01-31 13:41:07.419 Exception in thread Thread[StorageServiceShutdownHook,5,main]

java.lang.NullPointerException: null

                at org.apache.cassandra.service.StorageService.stopNativeTransport(StorageService.java:349) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.StorageService.shutdownClientServers(StorageService.java:364) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.StorageService.access$3(StorageService.java:361) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.service.StorageService$1.runMayThrow(StorageService.java:551) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.0.4-SNAPSHOT.jar:2.0.4-SNAPSHOT]

                at java.lang.Thread.run(Thread.java:724) ~[na:1.7.0_40]

2014-01-31 13:41:07.420 ShutDownHook requests shutdown on be.landc.services.cdi.server.cassandra.CDIServer@7c32d1a3

2014-01-31 13:41:07.421 Shutdown server request