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From "Neha Narkhede (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-1154) replicas may not have consistent data after becoming follower
Date Mon, 02 Dec 2013 16:49:37 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-1154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13836683#comment-13836683
] 

Neha Narkhede commented on KAFKA-1154:
--------------------------------------

We used to do this, looks like this was a regression introduced in KAFKA-1001. 

1. ReplicaManager
Do we still need this "TODO: the above may need to be fixed later" ?

2. We had added the ability for a special consumer to read the replica log for troubleshooting.
This patch takes that convenience away. We should probably look for another way to prevent
the replica verification tool from giving false negatives. Can it use a different consumer
id?


> replicas may not have consistent data after becoming follower
> -------------------------------------------------------------
>
>                 Key: KAFKA-1154
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1154
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.8.1
>            Reporter: Jun Rao
>            Assignee: Jun Rao
>             Fix For: 0.8.1
>
>         Attachments: KAFKA-1154.patch
>
>
> This is an issued introduced in KAFKA-1001. The issue is that in ReplicaManager.makeFollowers(),
we truncate the log before marking the replica as the follower. New messages from the producer
can still be added to the log after the log is truncated, but before the replica is marked
as the follower. Those newly produced messages can actually be committed, which implies those
truncated messages are also committed. However, the new leader is not guaranteed to have those
truncated messages.



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