Define interface between bookie and ledger storage
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Key: BOOKKEEPER-196
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-196
Project: Bookkeeper
Issue Type: Improvement
Reporter: Ivan Kelly
Assignee: Ivan Kelly
Fix For: 4.1.0
EntryLogger and LedgerCache are both part of a very interdependent storage
mechanism where entries are interleaved in a single log(EntryLogger) and index
files are maintained (LedgerCache). I'd like to experiment with some other
schemes (Im not convinced the interleaving is required for high performance).
ZOOKEEPER-507 brought in these changes, but it also brought in a lot of other
stuff, and I think its the other stuff (specifically taking the writing to
separate files out of the critical path) which gave us the performance boost.
To do this cleanly, we need a well defined storage interface for this. This
JIRA is to provide this. Future work can move the interleaved implementation
into another package as org.apache.bookkeeper.bookie is getting a little
crowded now.
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