I can reproduce this now. It turns out that this log message is in
IdealState#getPreferenceList, and will print when there are no live instances
in the cluster because of a short-circuit that the auto rebalance algorithm
does (basically saying that a partition has a null assignment rather than an
empty one).
So in short, this log message can be ignored. I created
https://issues.apache.org/jira/browse/HELIX-355 to resolve this in future
releases.
Kanak
> Date: Sun, 12 Jan 2014 00:00:50 -0800
> From: [email protected]
> To: [email protected]
> Subject: Re: Resource does not have a precomputed preference list
>
> This is the code I use to create the resource ideal state:
>
>
> IdealStateBuilder isb = new AutoRebalanceModeISBuilder(resourceName);
> isb.setNumPartitions(nPartitions);
> isb.setNumReplica(nReplicas);
> isb.setStateModel(smType.getName());
> isb.setMaxPartitionsPerNode(Integer.MAX_VALUE);
> hManager.getClusterManagmentTool().addResource(hManager.getClusterName(),
> resourceName,
> isb.build());
>
> Vinayak
>
>
> On 1/11/14, 10:14 PM, Kanak Biscuitwala wrote:
> >
> > AFAIK, this log message is shown in two situations:
> >
> > - In FULL_AUTO (AUTO_REBALANCE) when the algorithm doesn't compute a
> > mapping for certain partitions (this should never happen)
> > - In SEMI_AUTO (AUTO) when you try to rebalance a resource with an empty
> > list field (i.e. preference list) for a partition in your resource
> >
> > In either case, I would say it's typically worth a warning because it's
> > essentially saying that you have unmapped partitions. Is this consistent
> > with your usage?
> > ------------------------------------------------------------------------
> > Date: Fri, 10 Jan 2014 09:21:22 -0800
> > Subject: Re: Resource does not have a precomputed preference list
> > From: [email protected]
> > To: [email protected]
> > CC: [email protected]
> >
> > What is the idealstate mode for the resource?. How is the resource
> > configured?
> >
> >
> > On Fri, Jan 10, 2014 at 7:13 AM, Vinayak Borkar <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> > Hi Guys,
> >
> >
> > I just switched to 0.6.2-incubating from 0.6.1-incubating. I have
> > now started to see messages such as "Resource does not have a
> > precomputed preference list". This message is currently being logged
> > in WARN mode. Is this truly a warning, or is it just that the log
> > level is misclassified?
> >
> > Thanks,
> > Vinayak
> >
> >
>
