[jira] [Updated] (ZOOKEEPER-4858) Remove the lock contention between snapshotting and the sync operation

["Kezhu Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kezhu Wang updated ZOOKEEPER-4858:
----------------------------------
    Affects Version/s: 3.9.3

> Remove the lock contention between snapshotting and the sync operation
> ----------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-4858
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4858
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.9.0, 3.9.1, 3.9.2, 3.9.3
>            Reporter: Li Wang
>            Assignee: Li Wang
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.10.0, 3.9.4
>
>          Time Spent: 3h 10m
>  Remaining Estimate: 0h
>
> Remove the synchronized keyword from Zookeeper.takeSnapshot() and  ZookeeperServer.restoreFromSnapshot() API, as it causes lock contention on the ZookeeperServer object with the sync operation. 
> In ZookeeperServer.java, we have the following
> {code:java}
>  public synchronized File takeSnapshot(boolean syncSnap, boolean isSevere, boolean fastForwardFromEdits) throws IOException {
> ....
> }
> {code}
> In ObserverZookeeperServer.java and FollowerZookeeperServer.java, we have the following
>        
> {code:java}
> public synchronized void sync() {
>      ...
>     }
> {code}



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