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https://issues.apache.org/jira/browse/ZOOKEEPER-462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flavio Paiva Junqueira updated ZOOKEEPER-462:
---------------------------------------------
Attachment: ZOOKEEPER-462.patch
This patch addresses this issue by writing to a znode ("last_confirmed") every
rateLastHint successful writes. rateLastHint is a parameter of the createLedger
call. Note that I have added calls with different signatures, but I have
maintained the previous ones for compatibility purposes.
> 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
> 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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