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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7340) rollingUpgrade prepare command does not have retry cache support
Date Tue, 04 Nov 2014 03:41:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14195669#comment-14195669

Jing Zhao commented on HDFS-7340:

If we add retry cache support for start/finalize rollingUpgrade, we need to add rpcId and
clientId into the corresponding editlog. This means layout version may need to be bumped.

Instead, we can make start/finalize rollingUpgrade idempotent.

> rollingUpgrade prepare command does not have retry cache support
> ----------------------------------------------------------------
>                 Key: HDFS-7340
>                 URL: https://issues.apache.org/jira/browse/HDFS-7340
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.6.0
>            Reporter: Arpit Gupta
>            Assignee: Jing Zhao
> I was running this on a HA cluster with dfs.client.test.drop.namenode.response.number
set to 1. So the first request goes through but the response is dropped. Which then causes
another request which fails and says a request is already in progress. We should add retry
cache support for this.

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