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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13687) ConfiguredFailoverProxyProvider could direct requests to SBN
Date Tue, 19 Jun 2018 07:41:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16516754#comment-16516754
] 

Chao Sun commented on HDFS-13687:
---------------------------------

Thanks [~xkrogen] and [~shv] for the very valuable comments! Regarding Konstantin's comments:

1. Very good point. Sorry I didn't know that {{getServiceStatus}} requires super privilege.
Another option might be to add another interface/protocol to get the active/standby state
from NN, [as proposed in the original JIRA|https://issues.apache.org/jira/browse/HDFS-2917?focusedCommentId=13204178&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-13204178].
2. Yes good point. Perhaps we can reuse {{NameNodeHAProxyFactory}} to create the factory needed
in our case. 
3. Can you elaborate more on this?. Currently {{ConfiguredFailoverProxyProvider}} does assume
all remote addresses are NN, right?

Will go back to HDFS-12976 in the mean time.

> ConfiguredFailoverProxyProvider could direct requests to SBN
> ------------------------------------------------------------
>
>                 Key: HDFS-13687
>                 URL: https://issues.apache.org/jira/browse/HDFS-13687
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Chao Sun
>            Assignee: Chao Sun
>            Priority: Minor
>         Attachments: HDFS-13687.000.patch
>
>
> In case there are multiple SBNs, and {{dfs.ha.allow.stale.reads}} is set to true, failover
could go to a SBN which then may serve read requests from client. This may not be the expected
behavior. This issue arises when we are working on HDFS-12943 and HDFS-12976.
> A better approach for this could be to check {{HAServiceState}} and find out the active
NN when performing failover. This also can reduce the # of failovers the client has to do
in case of multiple SBNs.



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