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From "Benjamin Reed (JIRA)" <j...@apache.org>
Subject [jira] Updated: (ZOOKEEPER-486) Improve bookie performance for large number of ledgers
Date Mon, 14 Dec 2009 17:43:18 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benjamin Reed updated ZOOKEEPER-486:
------------------------------------

    Attachment: ZOOKEEPER-486.patch

fixed the check for no lodger in bookie.java

> Improve bookie performance for large number of ledgers
> ------------------------------------------------------
>
>                 Key: ZOOKEEPER-486
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-486
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: contrib-bookkeeper
>            Reporter: Flavio Paiva Junqueira
>            Assignee: Benjamin Reed
>         Attachments: ZOOKEEPER-486.patch, ZOOKEEPER-486.patch
>
>
> If we write simultaneously to a large number of ledgers on a bookie, then performance
drops significantly due to more seeks on the ledger device. In such cases, we should be clustering
ledgers into files to reduce the number of seeks, and performing sequential writes on each
file. Clustering ledgers will impact read performance, so we would to have a knob to control
such a feature.

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