Hi Ming, There is an example https://git-wip-us.apache.org/repos/asf?p=incubator-helix.git;a=blob;f=helix-core/src/main/java/org/apache/helix/examples/IdealStateExample.java;hb=437eb42e . admin.addResource(clusterName, resourceName, numPartitions, stateModelName, "AUTO"); // rebalance resource "TestDB" using 3 replicas admin.rebalance(clusterName, resourceName, numReplica);
This will automatically do the partition placement among the nodes in the cluster. We use a mix of consistent hashing and crush http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf to do the placement. But i think you need a way to come up with your own logic of assigning the replica set for a partition. You can find an example for that in BaseStageTest. See setupIdealState https://git-wip-us.apache.org/repos/asf?p=incubator-helix.git;a=blob;f=helix-core/src/test/java/org/apache/helix/controller/stages/BaseStageTest.java;h=ed54e6facdc17b40bd8eeb56c4cfaa5ad39ea91b;hb=437eb42e Here is the code snippet.http://pastebin.com/e2LXtq46. Hope this helps Thanks, Kishore G On Thu, Feb 14, 2013 at 8:03 AM, Ming Fang <[email protected]> wrote: > Can someone point me to an example of how to specify partition placement > when using AUTO mode? > The link here http://helix.incubator.apache.org/Features.html says it's > possible but I was not able to find any example or unit test that does this. > Thanks > --ming
