[jira] Updated: (ZOOKEEPER-462) Last hint for open ledger

["Flavio Paiva Junqueira (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flavio Paiva Junqueira updated ZOOKEEPER-462:
---------------------------------------------

    Fix Version/s:     (was: 3.3.0)
                   3.4.0

This issue needs more discussion, and the feature it proposes is not strictly necessary, so I recommend that we move it to 3.4.0.

> 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: 3.4.0
>
>         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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.