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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2700) Force ZooKeeper to generate snapshot
Date Wed, 22 Feb 2017 02:46:44 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877343#comment-15877343
] 

ASF GitHub Bot commented on ZOOKEEPER-2700:
-------------------------------------------

Github user flier commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/180#discussion_r102372975
  
    --- Diff: src/java/main/org/apache/zookeeper/server/ZooKeeperServer.java ---
    @@ -303,15 +305,38 @@ public void loadData() throws IOException, InterruptedException
{
     
         public void takeSnapshot(){
    --- End diff --
    
    @hanm Thanks for your advice :)
    
    We are using a similar structure as `2.2 Alternative 2 – Learners` in the paper, it
is good enough for most of online scenes. I don't think it is worthy to introduce another
layer because we give up the write operation to all observers, just use it as a read only
view.
    
    For the remote replication, I doubt it also blocked by packet loss rate like Observer.
On the other hand, we have an internal project named `zkpipe`, it read Zookeeper snapshot/binlog
and send it to a Kafka topic, our client could choose to rebuild the transaction or subscribe
the changes. I believe it will better than hack Zookeeper itself. If you have interested,
I could push it to github later.


> Force ZooKeeper to generate snapshot
> ------------------------------------
>
>                 Key: ZOOKEEPER-2700
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2700
>             Project: ZooKeeper
>          Issue Type: Improvement
>            Reporter: Flier Lu
>            Priority: Minor
>
> When cold backup or remote offline sync Zookeeper instances, we need the latest snapshot.
> Add a four letter `snap` command to force Zookeeper to generate snapshot.



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