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From "Jie Huang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-3437) Improve sync throttling on a learner master
Date Thu, 20 Jun 2019 19:20:00 GMT
Jie Huang created ZOOKEEPER-3437:
------------------------------------

             Summary: Improve sync throttling on a learner master
                 Key: ZOOKEEPER-3437
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3437
             Project: ZooKeeper
          Issue Type: Improvement
          Components: quorum
    Affects Versions: 3.6.0
            Reporter: Jie Huang
             Fix For: 3.6.0


As described in ZOOKEEPER-1928, a leader can become overloaded if it sends too many snapshots
concurrently during sync time.  Sending too many diffs at the same time can also cause the
overloading issue. 

In this JIRA, we will:
 # add diff sync throttling in addition to snap sync throttling
 # extend the protection to followers that serve observers
 # improve the counting of concurrent snap syncs/diff syncs to avoid double counting or missing
counting



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