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From "Mikhail Stepura (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6103) ConcurrentModificationException in TokenMetadata.cloneOnlyTokenMap
Date Sat, 28 Sep 2013 03:08:03 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13780667#comment-13780667
] 

Mikhail Stepura commented on CASSANDRA-6103:
--------------------------------------------

I'm curious, each access to {{tokenToEndpointMap}} is guarded by either read or write lock,
on other hand {{endpointToHostIdMap}} is accessed without any lock in most cases. Is it by
design?
                
> ConcurrentModificationException in TokenMetadata.cloneOnlyTokenMap
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-6103
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6103
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Mike Schrag
>             Fix For: 1.2.11
>
>
> This isn't reproducible for me, but it happened to one of the servers in our cluster
while starting up. It went away on a restart, but I figured it was worth filing anyway:
> ERROR [main] 2013-09-26 08:04:02,478 CassandraDaemon.java (line 464) Exception encountered
during startup
> java.util.ConcurrentModificationException
>         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
>         at java.util.HashMap$EntryIterator.next(HashMap.java:834)
>         at java.util.HashMap$EntryIterator.next(HashMap.java:832)
>         at com.google.common.collect.AbstractBiMap$EntrySet$1.next(AbstractBiMap.java:294)
>         at com.google.common.collect.AbstractBiMap$EntrySet$1.next(AbstractBiMap.java:286)
>         at com.google.common.collect.AbstractBiMap.putAll(AbstractBiMap.java:160)
>         at com.google.common.collect.HashBiMap.putAll(HashBiMap.java:42)
>         at com.google.common.collect.HashBiMap.create(HashBiMap.java:72)
>         at org.apache.cassandra.locator.TokenMetadata.cloneOnlyTokenMap(TokenMetadata.java:561)
>         at org.apache.cassandra.locator.AbstractReplicationStrategy.getAddressRanges(AbstractReplicationStrategy.java:192)
>         at org.apache.cassandra.service.StorageService.calculatePendingRanges(StorageService.java:1711)
>         at org.apache.cassandra.service.StorageService.calculatePendingRanges(StorageService.java:1692)
>         at org.apache.cassandra.service.StorageService.handleStateNormal(StorageService.java:1461)
>         at org.apache.cassandra.service.StorageService.onChange(StorageService.java:1228)
>         at org.apache.cassandra.gms.Gossiper.doNotifications(Gossiper.java:949)
>         at org.apache.cassandra.gms.Gossiper.addLocalApplicationState(Gossiper.java:1116)
>         at org.apache.cassandra.service.StorageService.setTokens(StorageService.java:214)
>         at org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:802)
>         at org.apache.cassandra.service.StorageService.initServer(StorageService.java:554)
>         at org.apache.cassandra.service.StorageService.initServer(StorageService.java:451)

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