drcrallen commented on a change in pull request #6829: Don't force rebalance of
the whole cluster all the time
URL: https://github.com/apache/incubator-druid/pull/6829#discussion_r248127985
##########
File path:
server/src/main/java/org/apache/druid/server/coordinator/helper/DruidCoordinatorBalancer.java
##########
@@ -106,8 +108,18 @@ private void balanceTier(
return;
}
- final List<ServerHolder> toMoveFrom = Lists.newArrayList(servers);
- final List<ServerHolder> toMoveTo = Lists.newArrayList(servers);
+ // Sort order is ascending based on available size. We reverse the "from"
to shed the largest nodes first
+ final List<ServerHolder> toMoveFrom;
+ final List<ServerHolder> toMoveTo;
+
+ final int nodeLimit =
params.getCoordinatorDynamicConfig().getBalancerNodeLimit();
+ if (nodeLimit > 0) {
+ toMoveFrom = Lists.reverse(randomSortedSubList(servers, nodeLimit));
Review comment:
You are correct, I miss-read how some of the sampling stuff works.
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