horizonzy commented on code in PR #3721:
URL: https://github.com/apache/bookkeeper/pull/3721#discussion_r1063938807
##########
bookkeeper-server/src/main/java/org/apache/bookkeeper/client/RackawareEnsemblePlacementPolicyImpl.java:
##########
@@ -414,21 +414,33 @@ protected PlacementResult<List<BookieId>>
newEnsembleInternal(
}
return PlacementResult.of(addrs,
PlacementPolicyAdherence.FAIL);
}
-
+ //Choose different rack nodes.
+ String curRack = null;
for (int i = 0; i < ensembleSize; i++) {
- String curRack;
if (null == prevNode) {
if ((null == localNode) ||
defaultRack.equals(localNode.getNetworkLocation())) {
curRack = NodeBase.ROOT;
} else {
curRack = localNode.getNetworkLocation();
}
} else {
- curRack = "~" + prevNode.getNetworkLocation();
+ if (!curRack.startsWith("~")) {
+ curRack = "~" + prevNode.getNetworkLocation();
+ } else {
+ curRack = curRack + NetworkTopologyImpl.NODE_SEPARATOR
+ prevNode.getNetworkLocation();
+ }
+ }
+ try {
+ prevNode = selectRandomFromRack(curRack, excludeNodes,
ensemble, ensemble);
Review Comment:
Use `selectRandomFromRack` instead of `selectFromNetworkLocation`.
There are two reasons:
1. `selectFromNetworkLocation` params `fallbackToRandom` may step down to
pick a node randomly.
2. If the user config `setNetworkTopologyStabilizePeriodSeconds`,
RackawareEnsemblePlacementPolicy#selectFromNetworkLocation may step down to
pick node from slave.
We should avoid it, just pick different node without steping down.
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