You are viewing a plain text version of this content. The canonical link for it is here.
Posted to notifications@accumulo.apache.org by "Josh Elser (JIRA)" <ji...@apache.org> on 2014/01/03 00:49:50 UTC
[jira] [Assigned] (ACCUMULO-2036) Mappers are not running locally
[ https://issues.apache.org/jira/browse/ACCUMULO-2036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Josh Elser reassigned ACCUMULO-2036:
------------------------------------
Assignee: Josh Elser
> Mappers are not running locally
> -------------------------------
>
> Key: ACCUMULO-2036
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2036
> Project: Accumulo
> Issue Type: Bug
> Reporter: Keith Turner
> Assignee: Josh Elser
> Fix For: 1.6.0
>
>
> I ran listscans in the Accumulo shell while running continuous verify on small cluster and almost not map task were running locally.
> I think ACCUMULO-1585 has broken mapper locality in 1.6.0-SNAPSHOT. Before that change Accumulo would always store IP addrs. Code like the following in o.a.a.c.client.mapreduce.AbstractInputFormat.getSplits() would translate IPs to hostnames.
> {code:java}
> if (location == null) {
> InetAddress inetAddress = InetAddress.getByName(ip);
> location = inetAddress.getHostName();
> hostNameCache.put(ip, location);
> }
> {code}
> In my case I configured Accumulo to use hostnames, but not fully qualified ones. So I think the above code was just passing the non-quallified hostname through. I suspected hadoop wanted FQDN and changed the code to the following and mappers ran locally. I need to confirm what hadoop is expecting. I think the above code will result in a FQDN if given an IP, so this is not an issue for 1.4 or 1.5.
> {code:java}
> if (location == null) {
> InetAddress inetAddress = InetAddress.getByName(ip);
> location = inetAddress.getCanonicalHostName();
> hostNameCache.put(ip, location);
> }
> {code}
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)