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From "Mahadev konar (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3251) Network ACLs can prevent some clients to talk to MR ApplicationMaster
Date Thu, 15 Dec 2011 08:52:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170043#comment-13170043
] 

Mahadev konar commented on MAPREDUCE-3251:
------------------------------------------

+1 the patch looks good Anupam. One very minor nit:

You are using tabs in one line in ClientServiceDelegate.java. Ill just reupload a new one
with the change.

{noformat}
       if(!conf.getBoolean(YarnConfiguration.RM_AM_NETWORK_ACL_CLOSED, false)) {
	  UserGroupInformation newUgi = UserGroupInformation.createRemoteUser(
              UserGroupInformation.getCurrentUser().getUserName());
{noformat}
Other than that the patch is good to go. Thanks for your patience on this!
                
> Network ACLs can prevent some clients to talk to MR ApplicationMaster
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3251
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3251
>             Project: Hadoop Map/Reduce
>          Issue Type: Task
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Anupam Seth
>            Assignee: Anupam Seth
>            Priority: Critical
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3251-branch_0_23.patch, MAPREDUCE-3251-branch_0_23.patch,
MAPREDUCE-3251-branch_0_23.patch, MAPREDUCE-3251_branch-0_23_preliminary.txt
>
>
> In 0.20.xxx, the JobClient while polling goes to JT to get the job status. With YARN,
AM can be launched on any port and the client will have to have ACL open to that port to talk
to AM and get the job status. When the client is within the same grid network access to AM
is not a problem. But some applications may have one installation per set of clusters and
may launch jobs even across such sets (on job trackers in another set of clusters). For that
to work only the JT port needs to be open currently. In case of YARN, all ports will have
to be opened up for things to work. That would be a security no-no.
> There are two possible solutions:
>   1) Make the job client only talk to RM (as an option) to get the job status. 
>   2) Limit the range of ports AM can listen on.
> Option 2) may not be favorable as there is no direct OS API to find a free port.

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