Varun Sharma created HELIX-551:
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Summary: External view & partition states go out of sync
Key: HELIX-551
URL: https://issues.apache.org/jira/browse/HELIX-551
Project: Apache Helix
Issue Type: Bug
Affects Versions: 0.6.4
Reporter: Varun Sharma
Hi,
I am seeing the following issue for many partitions in helix using a simple
Online->Offline state model factory. The external view says that the partition
has been assigned to 3 hosts. However, when I look at the hosts only 1 of them
executed the OFFLINE --> ONLINE transition.
On the hosts, that did not execute the transition, I see the following:
2014-11-13 09:29:54,394 [pool-3-thread-11]
(HelixStateTransitionHandler.java:206) WARN Force CurrentState on Zk to be
stateModel's CurrentState. partitionKey: 490, currentState: ONLINE, message:
12690ce8-8098-46b1-a93d-279604f0e3db, {CREATE_TIMESTAMP=1415870993349,
ClusterEventName=idealStateChange, EXECUTE_START_TIMESTAMP=1415870994382,
EXE_SESSION_ID=149a14ada0d0013, FROM_STATE=OFFLINE,
MSG_ID=12690ce8-8098-46b1-a93d-279604f0e3db, MSG_STATE=read,
MSG_TYPE=STATE_TRANSITION, PARTITION_NAME=490, READ_TIMESTAMP=1415870993787,
RESOURCE_NAME=$terrapin$data$meta_pin_join$1415866960201,
SRC_NAME=hdfsterrapin-a-namenode001_9090, SRC_SESSION_ID=147a7beb2dd8ed7,
STATE_MODEL_DEF=OnlineOffline, STATE_MODEL_FACTORY_NAME=DEFAULT,
TGT_NAME=hdfsterrapin-a-datanode-ba3ad256, TGT_SESSION_ID=149a14ada0d0013,
TO_STATE=ONLINE}{}{}
When I grep the message ID in the controller, I see the following:
2014-11-14 09:34:56,265 [StatusDumpTimerTask] (ZKPathDataDumpTask.java:155)
INFO {
"id" : "149a14ada0d0013__$terrapin$data$meta_pin_join$1415866960201",
"mapFields" : {
"HELIX_ERROR 20141113-092954.000419 STATE_TRANSITION
c1193025-b416-49d7-adc2-10afe2389141" : {
"AdditionalInfo" : "Message execution failed. msgId:
12690ce8-8098-46b1-a93d-279604f0e3db, errorMsg:
org.apache.helix.messaging.handling.HelixStateTransitionHandler$HelixStateMismatchException:
Current state of stateModel does not match the fromState in Message, Current
State:ONLINE, message expected:OFFLINE, partition: 490, from:
hdfsterrapin-a-namenode001_9090, to: hdfsterrapin-a-datanode-ba3ad256",
"Class" : "class
org.apache.helix.messaging.handling.HelixStateTransitionHandler",
"MSG_ID" : "12690ce8-8098-46b1-a93d-279604f0e3db",
"Message state" : "READ"
},
What could be causing this - when I restart the node, the error disappears
(meaning that the node is able to perform the state transition). What could be
causing this state mismatch ?
Thanks
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