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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9458) TestBackupNode always binds to port 50070, which can cause bind failures.
Date Mon, 21 Dec 2015 22:31:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067176#comment-15067176

Xiao Chen commented on HDFS-9458:

Thanks [~cnauroth] for the comments! Attached patch 2.
bq. I think we still need to keep the line that sets {{DFS_NAMENODE_HTTP_ADDRESS_KEY}}. This
test starts both a regular NameNode and a BackupNode. We'll want to avoid binding to default
ports for both of those.
I think you meant to say we need {{DFS_NAMENODE_BACKUP_HTTP_ADDRESS_KEY}}? This was unnecessarily
set twice. I kept the line that sets it at line 161 (line # in trunk), the patch removed the
first one.

bq. It's also problematic that the NameNode RPC port is hard-coded to 1234 (FS_DEFAULT_NAME_KEY).
I recommend that we change that to 0 too.
We can't set it to 0 here because in {{BackupNode#initialize}} where {{handshake}} is invoked,
rpc address is read from configuration. Thus we need to set it to a port numer. I have just
learnt that we have a util to get a usable ephemeral port, so updated patch 2 to use {{ServerSocketUtil#getport}}.

> TestBackupNode always binds to port 50070, which can cause bind failures.
> -------------------------------------------------------------------------
>                 Key: HDFS-9458
>                 URL: https://issues.apache.org/jira/browse/HDFS-9458
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>            Reporter: Chris Nauroth
>            Assignee: Xiao Chen
>         Attachments: HDFS-9458.001.patch, HDFS-9458.002.patch
> {{TestBackupNode}} does not override port settings to use a dynamically selected port
for the NameNode HTTP server.  It uses the default of 50070 defined in hdfs-default.xml. 
This should be changed to select a dynamic port to avoid bind errors.

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