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From "Desimpel, Ignace" <Ignace.Desim...@nuance.com>
Subject FW: Sporadic gossip exception on add node
Date Mon, 24 Feb 2014 10:43:24 GMT
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<mailto:be.landc.services.cdi.server.cassandra.CDIServer@7c32d1a3>
2014-01-31 13:41:07.421 Shutdown server request

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