accumulo-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-118) accumulo could work across HDFS instances, which would help it to scale past a single namenode
Date Wed, 11 Jul 2012 14:56:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411597#comment-13411597
] 

Eric Newton commented on ACCUMULO-118:
--------------------------------------

I'm leaning towards using full-paths for filenames, and having the system select a path based
on a pluggable component.  The NN references would be handled by viewfs and federation.

This will be an extensive change, and it's going to take a while to refactor the code to deal
with full paths.

There are a bunch of places where we rely on {{rename()}} being inexpensive. If we move something
from {{/nn1/accumulo/tables}} to {{//nn2/accumulo/tables}} that will be expensive.  Usually
we are just renaming a file from {{foo.tmp}} to {{foo}}, which will work fine.  But there
are others:

 * bulk import
 * log archiving
 * others?

these renames will need to be namespace aware.

                
> accumulo could work across HDFS instances, which would help it to scale past a single
namenode
> ----------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-118
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-118
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: master, tserver
>    Affects Versions: 1.5.0
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>   Original Estimate: 2,016h
>  Remaining Estimate: 2,016h
>
> Consider using full path names to files, which would allow the servers to access the
files on any HDFS file system.
> Work may exist elsewhere to run HDFS using a number of NameNode instances to break up
the namespace.
> We may need a pluggable strategy to determine namespace for new files.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message