Hi, all I met a problem of NodeExistsException when creating a znode with sequential and ephemeral mode. the number of total test was 6442314 and 797 errors had occurred.
The related log message is as in the following: 2011-08-27 16:26:17,559 - INFO [ProcessThread:-1:PrepRequestProcessor@407][] - Got user-level KeeperException when processing sessionid:0x2320911802a0002 type:create cxid:0x1246d7 zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error Path:/NexR/MasteElection/__rwLock/readLock-lssm07-0005967078 Error:KeeperErrorCode = NodeExists for /NexR/MasteElection/__rwLock/readLock-lssm07-0005967078 The sequential number would be created by increasing parent's Cversion in the PrepRequestProcess. So, I guess that this problem was caused by inconsistency of parent znode. Our test scenario is very aggressive: The grinder agent sends a request of creating a znode of CreateMode. SEQUENTIAL_EPHEMERAL. three number of servers compose ensemble. each NIC of server is down and up repeatedly; NIC of server1 become down every one minute and sleeping for 9 seconds, then up NIC of server2 become down every 2 minute and sleeping for 9 seconds, then up NIC of server3 become down every 3 minute and sleeping for 9 seconds, then up while the probability of error occurrence is 0.0001 as mentioned above, if the ZooKeeper cannot guarantee the consistency, it is a fatal. Is there any idea or related issue? thanks in advance. alex.
