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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-462) Last hint for open ledger
Date Thu, 08 Oct 2009 17:16:31 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763572#action_12763572

Patrick Hunt commented on ZOOKEEPER-462:

What's the status on this?

> Last hint for open ledger
> -------------------------
>                 Key: ZOOKEEPER-462
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-462
>             Project: Zookeeper
>          Issue Type: New Feature
>          Components: contrib-bookkeeper
>            Reporter: Flavio Paiva Junqueira
>            Assignee: Flavio Paiva Junqueira
>             Fix For: 3.3.0
>         Attachments: ZOOKEEPER-462.patch
> In some use cases of BookKeeper, it is useful to be able to read from a ledger before
closing the ledger. To enable such a feature, the writer has to be able to communicate to
a reader how many entries it has been able to write successfully. The main idea of this jira
is to continuously update a znode with the number of successful writes, and a reader can,
for example, watch the node for changes.
>  I was thinking of having a configuration parameter to state how often a writer should
update the hint on ZooKeeper (e.g., every 1000 requests, every 10,000 requests). Clearly updating
more often increases the overhead of writing to ZooKeeper, although the impact on the performance
of writes to BookKeeper should be minimal given that we make an asynchronous call to update
the hint.

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