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From "Michael Han (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-2020) Change TRUNC to SNAP in sync phase for safety guarantee
Date Mon, 13 Mar 2017 16:22:08 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Michael Han updated ZOOKEEPER-2020:
    Fix Version/s:     (was: 3.5.3)

> Change TRUNC to SNAP in sync phase for safety guarantee 
> --------------------------------------------------------
>                 Key: ZOOKEEPER-2020
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2020
>             Project: ZooKeeper
>          Issue Type: Sub-task
>          Components: quorum
>    Affects Versions: 3.5.0
>            Reporter: Hongchao Deng
>             Fix For: 3.5.4, 3.6.0
> ZOOKEEPER-1549 discusses the problem:
> "When the leader started, it will apply every txn in its txnlog (incl. uncommitted ones)
into its in-memory data tree"
> I didn't any solution so far solved this problem in 3.5.x. Since this affects only TRUNC
part -- only old leader that needs TRUNC applies uncommitted txns, a simple fix would be change
current TRUNC logic to SNAP. This isn't hard to implement, but guarantees safety.
> Ideally, we will solve the whole problem by untangling all compatibility issues and fixing
the protocol.

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