Last hint for open ledger
Issue Type: New Feature
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
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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