[jira] Commented: (HADOOP-3905) Factor out a common interface for edits log.

["Konstantin Shvachko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620116#action_12620116 ] 

Konstantin Shvachko commented on HADOOP-3905:
---------------------------------------------

HADOOP-3860 concluded particularly that edits log currently presents one of the main bottlenecks for the name-node performance.
Currently we can save edits records only into a file and are bound by hard drive performance.
We may try to stream edits e.g. into a database or another high performance system optimized for writes.

My primary focus though is to make it possible to stream records into a secondary name-node so that the latter could 
always keep an up todate namespace state with a perspective of building an HA solution based on that.

> Factor out a common interface for edits log.
> --------------------------------------------
>
>                 Key: HADOOP-3905
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3905
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.19.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.19.0
>
>
> Create a generic interface that would cover all edit log operations and be useful for implementing journaling functionality on different storage sources.

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