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From Ming Fang <mingf...@mac.com>
Subject Re: Potential bug in manual partition placement
Date Fri, 22 Feb 2013 00:34:09 GMT
Thanks for pointing that out.
It does work was expected after I set REPLICAS to 3.

But the strange thing is even with REPLICAS set to 2 and placement configured as below, everything
works.
        "MyResource_0" : [ "localhost_12000", "localhost_12001", "localhost_12002" ],
        "MyResource_1" : [ "localhost_12000", "localhost_12001", "localhost_12002" ]

On Feb 20, 2013, at 2:02 AM, kishore g <g.kishore@gmail.com> wrote:

> https://github.com/mingfang/apache-helix/blob/master/helix-core/src/main/resources/manual.json
has replicas set to 2 but the preference list for each partition is of size 3. If you set
the number of REPLICAS to 3, it should work. 
> 
> We do some validation of the idealstate but we dont validate that number of replicas
is same as the preference list size for all partitions. Created JIRA https://issues.apache.org/jira/browse/HELIX-50
> 
> 
> Thanks,
> Kishore G  
> 
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> 
> On Tue, Feb 19, 2013 at 7:08 PM, Ming Fang <mingfang@mac.com> wrote:
> I've "repurpose" the Quickstart example in an attempt to implement manual placement of
partitions.
> I'm using JSON file and the relevant section is below
> 
>         "MyResource_0" : [ "localhost_12000", "localhost_12001", "localhost_12002" ],
>         "MyResource_1" : [ "localhost_12001", "localhost_12000", "localhost_12002" ]
> 
> The goal is to make _12000 the MASTER for MyResource_0 and _12001 the MASTER of MyResource_1.
> The last instance, _12002 will serve as the last resort backup for both partitions in
the event the other two died.
> This is a small example of what I was hoping to implement as part of a larger system.
> 
> You may run the example here
> https://github.com/mingfang/apache-helix/blob/master/helix-core/src/main/java/org/apache/helix/examples/ManualPlacementTest.java
> 
> using the JSON file here
> https://github.com/mingfang/apache-helix/blob/master/helix-core/src/main/resources/manual.json
> 
> The problem is when I run this, the output looks like this
> 
> STARTING Zookeeper at localhost:2199
> Creating cluster: HELIX_QUICKSTART
> Adding 3 participants to the cluster
>          Added participant: localhost_12000
>          Added participant: localhost_12001
>          Added participant: localhost_12002
> Starting Participants
>          Started Participant: localhost_12000
>          Started Participant: localhost_12001
>          Started Participant: localhost_12002
> Starting Helix Controller
> localhost_12000 transitioning from OFFLINE to SLAVE for MyResource_0
> localhost_12002 transitioning from OFFLINE to SLAVE for MyResource_1
> localhost_12000 transitioning from OFFLINE to SLAVE for MyResource_1
> localhost_12002 transitioning from OFFLINE to SLAVE for MyResource_0
> localhost_12000 transitioning from SLAVE to MASTER for MyResource_0
> localhost_12001 transitioning from OFFLINE to SLAVE for MyResource_0
> CLUSTER STATE: After starting 3 nodes
>                 localhost_12000 localhost_12001 localhost_12002
>         MyResource_0    M               S               S
>         MyResource_1    S               -               S
> ###################################################################
> 
> Notice there is no MASTER for MyResource_1.
> I've been trying to debug this for a day now with no success.
> 
> Did I stumble onto an actual bug?
> 


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