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https://issues.apache.org/jira/browse/BOOKKEEPER-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13527652#comment-13527652
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Yixue (Andrew) Zhu commented on BOOKKEEPER-256:
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Maybe I miss something, I do not think the protocol works. For example of
following sequence,
1. A add message, let us denote it as [A1]. The state after [A1] reached B, but
not C yet.
A 1
B 1 1
C
2. B add message, let us denote it as [A1, B2]. The state after [A1, B2]
reached C.
A 1
B 1 2
C 2 1
[A1, B2] is persisted as (B2, C1)
3. [A1] reaches C.
A 1
B 1 2
C 1 2 2
[A1] is persisted as (A1, B2 , C2)
Now, when client in Region C read from the topic, how does it interpret the
order between [A1] versus [A1, B2], since the former is persisted as (B2, C1),
while the latter is persisted as (A1, B2 , C2).
The problem can be addressed if we separate the region clock/version vector
state with message persistence.
> Update remote component sequence IDs only for messages from the source region
> -----------------------------------------------------------------------------
>
> Key: BOOKKEEPER-256
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-256
> Project: Bookkeeper
> Issue Type: Improvement
> Components: hedwig-server
> Affects Versions: 4.0.0, 4.1.0
> Reporter: Aniruddha
> Assignee: Aniruddha
> Priority: Minor
> Fix For: 4.2.0
>
> Attachments: BK-256.patch, BK-256.patch, BK-256-v1.patch,
> BK-256-v2.patch
>
>
> In the current setup, remote components for a message being persisted don't
> give any meaningful information about the number of messages the hub has
> received for that topic from other regions. The provided patch fixes this by
> updating the remote component of the locally persisted message for a region X
> only if the message received by the RegionManager originates from region X.
> Edit - You can take a look at the discussion at
> http://mail-archives.apache.org/mod_mbox/zookeeper-bookkeeper-dev/201205.mbox/%3cCAOLhyDTEm5=p8emd8xmvcy_6ktb40rqx6dwwy50arbaebdg...@mail.gmail.com%3e
> for context.
> Review board link : https://reviews.apache.org/r/6789/
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