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From "Fangmin Lv (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3124) Remove special logic to handle cversion and pzxid in DataTree.processTxn
Date Wed, 22 Aug 2018 20:59:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16589337#comment-16589337

Fangmin Lv commented on ZOOKEEPER-3124:

[~hanm] do you have any idea why we need to keep these code around: 


> Remove special logic to handle cversion and pzxid in DataTree.processTxn
> ------------------------------------------------------------------------
>                 Key: ZOOKEEPER-3124
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3124
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Fangmin Lv
>            Assignee: Fangmin Lv
>            Priority: Major
>             Fix For: 3.6.0
> There is special logic in the DataTree.processTxn to handle the NODEEXISTS when createNode,
which is used to handle the cversion and pzxid not being updated due to fuzzy snapshot: 
> https://github.com/apache/zookeeper/blob/master/src/java/main/org/apache/zookeeper/server/DataTree.java#L962-L994. 
> But is this a real issue, or is it still an issue for now?
> In the current code, when serializing a parent node, we'll lock on it, and take a children
snapshot at that time. If the child added after the parent is serialized to disk, then it
won't be written out, so we shouldn't hit the issue where the child is in the snapshot but
parent cversion and pzxid is not changed.
> I checked the JIRA ZOOKEEPER-1269 which added this code, it won't hit this issue as
well, I'm not sure why we added this, am I missing anything? Can we just get rid of it?

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