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From Varun Sharma <va...@pinterest.com>
Subject Re: Helix issue - External View out of sync
Date Tue, 18 Nov 2014 00:31:24 GMT
I am using 0.6.4. In this case, I created a resource and set its ideal
state and the partitions onlined themselves. It seems for that node - it
opened a whole bunch of other partitions at around the same time (~ 30 or
so) but failed to open 3-4 partitions. This was for a brand new resource I
created..

THanks !
Varun

On Mon, Nov 17, 2014 at 4:24 PM, kishore g <g.kishore@gmail.com> wrote:

> One suggestion is to check for GC pauses on the nodes. Nodes loses the
> cluster member ship if they get into long GC or starts flapping. That might
> be cause for state mismatch. However, external view must be up to date. It
> might help if you can attach the controller logs and node logs.
>
> On Mon, Nov 17, 2014 at 4:10 PM, Varun Sharma <varun@pinterest.com> wrote:
>
>> 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
>>
>> Varun
>>
>
>

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