[#HADOOP-3489] NPE in SafeModeMonitor

Hadoop Common

NPE in SafeModeMonitor

Created: 04/Jun/08 10:32 PM Updated: 08/Jul/09 04:43 PM

Component/s:

None

Affects Version/s:

0.18.0

Fix Version/s:

0.18.0

Time Tracking:

Not Specified

File Attachments:

	File Name	Date Attached	Attached By	Size
	HADOOP-3489-1.patch	2008-06-06 09:40 PM	Lohit Vijayarenu	0.5 kB

Hadoop Flags:	Reviewed
Resolution Date:	07/Jun/08 12:02 AM

Description

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If dfsadmin issues -safemode leave command when name-node is in the extended period of safe mode the SafeModeMonitor throws the following exception:

Exception in thread "org.apache.hadoop.dfs.FSNamesystem$SafeModeMonitor@dc86eb" java.lang.NullPointerException
	at org.apache.hadoop.dfs.FSNamesystem$SafeModeMonitor.run(FSNamesystem.java:3914)
	at java.lang.Thread.run(Thread.java:619)

The problem is that when SafeModeMonitor.run() wakes up it tries to check whether it canLeave() the safe mode, but the safe mode is off already,
and therefore the "safemode" field is null.

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