[HBASE-8975] NPE/HTTP 500 when opening the master's web UI too early

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.98.0, 0.95.2
• Hadoop Flags: Reviewed
• Assignee: Jean-Daniel Cryans
• Reporter: Jean-Daniel Cryans
• Created: 17/Jul/13 23:48
• Updated: 23/Sep/13 19:22
• Resolved: 19/Jul/13 18:27

Description

I'm getting an ugly NPE when trying to open the master's web UI too fast after starting it:

java.lang.NullPointerException
	at org.apache.hadoop.hbase.master.HMaster.getCoprocessors(HMaster.java:2053)
	at org.apache.hadoop.hbase.master.HMaster.getClusterStatus(HMaster.java:2003)
	at org.apache.hadoop.hbase.tmpl.master.BackupMasterStatusTmplImpl.renderNoFlush(BackupMasterStatusTmplImpl.java:39)
	at org.apache.hadoop.hbase.tmpl.master.BackupMasterStatusTmpl.renderNoFlush(BackupMasterStatusTmpl.java:111)
	at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.renderNoFlush(MasterStatusTmplImpl.java:237)
	at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.renderNoFlush(MasterStatusTmpl.java:376)
	at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.render(MasterStatusTmpl.java:366)
	at org.apache.hadoop.hbase.master.MasterStatusServlet.doGet(MasterStatusServlet.java:92)
...

At that point the ServerManager == null.