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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-842) Serialize NN edits log as avro records
Date Tue, 12 Jan 2010 18:53:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12799321#action_12799321

Todd Lipcon commented on HDFS-842:

Eli: in HDFS-855 Dhruba quoted 7 minutes to read a 6G image. That's the fsimage, so a bit
different than the edit log, but assumedly it would also be a candidate for Avro-ification.
7 minutes for 6G is only 14MB/sec, so sounds CPU bound to me.

> Serialize NN edits log as avro records
> --------------------------------------
>                 Key: HDFS-842
>                 URL: https://issues.apache.org/jira/browse/HDFS-842
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>            Reporter: Todd Lipcon
> Right now, the edits log is a mishmash of ad-hoc serialization and Writables. Switching
it over to Avro records would be really useful for operator tools - an "offline edits viewer"
would become trivial ("avrocat")

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