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From "Flavio Paiva Junqueira (JIRA)" <j...@apache.org>
Subject [jira] Created: (ZOOKEEPER-462) Last hint for open ledger
Date Sat, 11 Jul 2009 07:47:15 GMT
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

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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