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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10544) Balancer doesn't work with IPFailoverProxyProvider
Date Fri, 17 Jun 2016 22:15:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhe Zhang updated HDFS-10544:
-----------------------------
    Attachment: HDFS-10544.02.patch

Uploading v2 patch. So we have 2 alternatives:
* v1 patch: add {{useLogicalUri}} to take String as parameter
* v2 patch: throw {{IllegalArgumentException}} before trying to determine whether to use logical
URI.

I'm hesitating between the 2 options because the documentation is not completely clear about
{{dfs.nameservices}}. Could it be an arbitrary string? If that arbitrary string fails to form
a legal URI (when prefixed with {{hdfs://}}), shall we treat it just as a Runtime exception,
or we should look for that arbitrary string prefixed with {{dfs.namenode.servicerpc-address}}
in the config?

Any suggestions are very welcome.

> Balancer doesn't work with IPFailoverProxyProvider
> --------------------------------------------------
>
>                 Key: HDFS-10544
>                 URL: https://issues.apache.org/jira/browse/HDFS-10544
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-10544.00.patch, HDFS-10544.01.patch, HDFS-10544.02.patch
>
>
> Right now {{Balancer}} gets the NN URIs through {{DFSUtil#getNameServiceUris}}, which
returns logical URIs in HA is enabled. If {{IPFailoverProxyProvider}} is used, {{Balancer}}
will not be able to start.
> I think the bug is at {{DFSUtil#getNameServiceUris}}:
> {code}
>     for (String nsId : getNameServiceIds(conf)) {
>       if (HAUtil.isHAEnabled(conf, nsId)) {
>         // Add the logical URI of the nameservice.
>         try {
>           ret.add(new URI(HdfsConstants.HDFS_URI_SCHEME + "://" + nsId));
> {code}
> Then {{if}} clause should also consider if the {{FailoverProxyProvider}} has {{useLogicalURI}}
enabled. If not, {{getNameServiceUris}} should try to resolve the physical URI for this nsId.



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