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From "Ivan Kelly (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BOOKKEEPER-137) Do not create Ledger index files until absolutely necessary.
Date Fri, 02 Dec 2011 14:59:40 GMT
Do not create Ledger index files until absolutely necessary.
------------------------------------------------------------

                 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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