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From Ran Tavory <>
Subject ConcurrentModificationException in gossiper while decommissioning another node
Date Tue, 18 May 2010 11:55:43 GMT
While the node was in the process of decommissioning I see
this error in two other nodes:

 INFO [Timer-1] 2010-05-18 06:01:12,048 (line 179) InetAddress
/ is now dead.
 INFO [GMFD:1] 2010-05-18 06:04:00,189 (line 568) InetAddress
/ is now UP
 INFO [Timer-1] 2010-05-18 06:11:45,311 (line 401) FatClient / has been silent for 3600000ms, removing from gossip
ERROR [Timer-1] 2010-05-18 06:11:45,315 (line 88) Fatal
exception in thread Thread[Timer-1,5,main]
java.lang.RuntimeException: java.util.ConcurrentModificationException
        at java.util.TimerThread.mainLoop(
Caused by: java.util.ConcurrentModificationException
        at java.util.Hashtable$
        ... 2 more

.61 is the decommissioned node. .62 was under load (streams transferred to
it from .61)

I simply ran nodetool decommission on the 61 node and then (after an hour, I
guess) I saw this error in two other live nodes.

Does this ring any bell? It's either a bug, or that I wasn't
running decommission correctly...

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