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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4021) Misleading error message when resources are low on the NameNode
Date Mon, 08 Oct 2012 21:20:02 GMT
Colin Patrick McCabe created HDFS-4021:
------------------------------------------

             Summary: Misleading error message when resources are low on the NameNode
                 Key: HDFS-4021
                 URL: https://issues.apache.org/jira/browse/HDFS-4021
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 2.0.3-alpha
            Reporter: Colin Patrick McCabe
            Priority: Minor


When resources are low on the namenode, it enters SafeMode with a message like this:
{code}
14:00:10,666  WARN NameNodeResourceChecker:89 - Space available on
volume '/dev/hda1' is 104357888, which is below the configured
reserved amount 104857600
14:00:10,670  WARN FSNamesystem:3190 - NameNode low on available disk
space. Entering safe mode.
14:00:10,670  INFO StateChange:3836 - STATE* Safe mode is ON.
Resources are low on NN. Safe mode must be turned off manually.
{code}

However, turning off safe mode manually has no effect, since it immediately puts itself into
Safe Mode again with a log message like this:

{code}
 14:00:10,666  WARN NameNodeResourceChecker:89 - Space available on
volume '/dev/hda1' is 104357888, which is below the configured
reserved amount 104857600
14:00:10,670  WARN FSNamesystem:3190 - NameNode low on available disk
space. Entering safe mode.
14:00:10,670  INFO StateChange:3836 - STATE* Safe mode is ON.
Resources are low on NN. Safe mode must be turned off manually.
{code}

>From the shell, it looks like this:
{code}
 [cmccabe@vm1 h]$ ./bin/hdfs dfsadmin -safemode get
Safe mode is ON
[cmccabe@vm1 h]$ ./bin/hdfs dfsadmin -safemode leave
Safe mode is OFF
[cmccabe@vm1 h]$ ./bin/hdfs dfsadmin -safemode get
Safe mode is ON
{code}

It seems like we should change the message about turning off safe mode manually, if turning
off safe mode manually does not actually work for the case where resources are low.  Probably
we need to explain that safe mode should be turned off manually *after* adding more resources.
 As it is, the error message seems misleading.

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