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From "dhruba borthakur (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3092) Enable journal protocol based editlog streaming for standby namenode
Date Mon, 16 Apr 2012 18:40:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13254889#comment-13254889

dhruba borthakur commented on HDFS-3092:

I still somehow like the BK approach, especially because it can store transaction logs from
multiple namenodes, this is something that is very needed for HDFS-federation. If we can get
BK to scale and be performant, it is a possibility that HBase can store transaction logs in
there too, especially of the latencies are much smaller (and disk-failure recoveries faster)
than a typical HDFS write pipeline.  
> Enable journal protocol based editlog streaming for standby namenode
> --------------------------------------------------------------------
>                 Key: HDFS-3092
>                 URL: https://issues.apache.org/jira/browse/HDFS-3092
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, name-node
>    Affects Versions: 0.24.0, 0.23.3
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: MultipleSharedJournals.pdf, MultipleSharedJournals.pdf, MultipleSharedJournals.pdf
> Currently standby namenode relies on reading shared editlogs to stay current with the
active namenode, for namespace changes. BackupNode used streaming edits from active namenode
for doing the same. This jira is to explore using journal protocol based editlog streams for
the standby namenode. A daemon in standby will get the editlogs from the active and write
it to local edits. To begin with, the existing standby mechanism of reading from a file, will
continue to be used, instead of from shared edits, from the local edits.

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