hanm commented on a change in pull request #1047: [ZOOKEEPER-3500] Improving
the ZAB UPTODATE semantic to only issue it to learner when there is limited
lagging
URL: https://github.com/apache/zookeeper/pull/1047#discussion_r319274979
##########
File path:
zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/LearnerHandler.java
##########
@@ -615,21 +632,30 @@ public void run() {
syncThrottler.endSync();
syncThrottler = null;
- // now that the ack has been processed expect the syncLimit
- sock.setSoTimeout(learnerMaster.syncTimeout());
-
/*
* Wait until learnerMaster starts up
*/
learnerMaster.waitForStartup();
+ int queueSize = queuedPackets.size();
+ while (upToDatePacketsLimit > 0 && queueSize >
upToDatePacketsLimit) {
+ LOG.info("Waiting for learner queue to be drained before " +
+ "sending UPTODATE to {}, current queue size: {}",
+ sid, queueSize);
+ Thread.sleep(100);
Review comment:
make sense.
is it possible this loop never finishes? It seems that the `queuedPackets`
will be drained but no packets will be further queued in the same time, when we
are inside this loop, so it should terminate, but just to double check.
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