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From "Enrico Olivelli (Jira)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-1879) improve the correctness checking of txn log replay
Date Fri, 06 Sep 2019 15:43:11 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Enrico Olivelli updated ZOOKEEPER-1879:
---------------------------------------
    Fix Version/s: 3.5.7

> improve the correctness checking of txn log replay
> --------------------------------------------------
>
>                 Key: ZOOKEEPER-1879
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1879
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>    Affects Versions: 3.4.6, 3.5.0
>            Reporter: Patrick Hunt
>            Priority: Major
>             Fix For: 3.6.0, 3.5.6, 3.5.7
>
>
> In ZOOKEEPER-1573 we decided to fix an issue by relaxing some of the checking. Specifically
when the sequence of txns is as follows:
> * zxid 1: create /prefix/a
> * zxid 2: create /prefix/a/b
> * zxid 3: delete /prefix/a/b
> * zxid 4: delete /prefix/a
> the log may fail to replay.
> We addressed this by relaxing a check, which is essentially invalid for this case, but
is important in finding corruptions of the datastore.
> We should add this check back with proper validation of correctness.



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