GitHub user lei-xia opened a pull request:
https://github.com/apache/helix/pull/52
[HELIX-631] AutoRebalanceStrategy does not work correctly all the time.
What happened here is: Helix always assigns a random node for a new
(unassigned) replica (logic in assignOrphans()), and then try to move it to its
preferred node later. The random node chosen is based on the hashing of replica
name. Given a specific partition name and number of replicas, there could be a
case that no node can be found for a replica.
The fix is to always assign its preferred node to a new replica unless that
node is full, then randomly find another non-preferred node.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/lei-xia/helix helix-0.6.x
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/helix/pull/52.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #52
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commit 2c6df69d7206b2e64902c84842c61571315e30fa
Author: Lei Xia <[email protected]>
Date: 2016-09-13T00:54:40Z
[HELIX-631] AutoRebalanceStrategy does not work correctly all the time.
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