hadoop-yarn-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ajith S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5547) NMLeveldbStateStore should be more tolerant of unknown keys
Date Wed, 14 Sep 2016 13:22:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15490429#comment-15490429
] 

Ajith S commented on YARN-5547:
-------------------------------

As per offline discussion with [~Naganarasimha Garla] and [~varun_saxena] for {{If the old
software could consult a table in the database that lists what keys are ignorable then it
can fail for any unrecognized key that isn't in that list and safely ignore ones that are}}
we can add a suffix for the keys if they are ignoreable so that even lower version will know
if keys can be skipped safely

> NMLeveldbStateStore should be more tolerant of unknown keys
> -----------------------------------------------------------
>
>                 Key: YARN-5547
>                 URL: https://issues.apache.org/jira/browse/YARN-5547
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Ajith S
>         Attachments: YARN-5547.01.patch
>
>
> Whenever new keys are added to the NM state store it will break rolling downgrades because
the code will throw if it encounters an unrecognized key.  If instead it skipped unrecognized
keys it could be simpler to continue supporting rolling downgrades.  We need to define the
semantics of unrecognized keys when containers and apps are cleaned up, e.g.: we may want
to delete all keys underneath an app or container directory when it is being removed from
the state store to prevent leaking unrecognized keys.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: yarn-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: yarn-issues-help@hadoop.apache.org


Mime
View raw message