Do not create Ledger index files until absolutely necessary.
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Key: BOOKKEEPER-137
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-137
Project: Bookkeeper
Issue Type: Bug
Reporter: Ivan Kelly
Assignee: Ivan Kelly
Fix For: 4.1.0
This is an optimization to speed up the case where we have many ledgers and are
writing to them at random (a benchmark case we currently have). Currently, we
create the ledger index file and write the first 1k of it to disk immediately.
With a lot of ledgers being randomly written to, this means a lot of random
writes on the ledger disk. This fix postpones the creation of the index file
and writing of the first 1k until the first flush of the ledger.
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