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From "Fangmin Lv (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3049) would zookeeper transaction(multi) block the concurrent read?
Date Wed, 23 May 2018 04:11:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16486677#comment-16486677
] 

Fangmin Lv commented on ZOOKEEPER-3049:
---------------------------------------

The DataTree itself doesn't guarantee the atomic on multi-op, but the Zookeeper pipeline guarantees
the read and write request won't be processed concurrently, the read request will be blocked
in CommitProcessor when there is a write request being processed.

> would zookeeper transaction(multi) block the concurrent read?
> -------------------------------------------------------------
>
>                 Key: ZOOKEEPER-3049
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3049
>             Project: ZooKeeper
>          Issue Type: Wish
>          Components: documentation
>            Reporter: wayne
>            Priority: Major
>
> For instance, the original data for znode1 and znode2 are 2 and 4 respectively. I want
to perform increment operations over them. Finally, I would get (3, 5) for znode1 and znode2.
In order to keep atomicity, I used multi() api. Is there any possibility that any clients
could read (3, 4) concurrently? That is, the read happened after znode1++ and before znode2++?



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