[HBASE-13777] Table fragmentation display triggers NPE on master status page

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 0.98.13, 1.0.2, 1.2.0, 1.1.1, 2.0.0
• Component/s: UI
• Labels: beginner
• Assignee: Lars George
• Reporter: Lars George
• Created: 26/May/15 14:23
• Updated: 31/Aug/15 22:39
• Resolved: 28/May/15 08:19

Description

Steps to reproduce:

• Enable UI support for Fragmentation

  <property>
    <name>hbase.master.ui.fragmentation.enabled</name>
    <value>true</value>
  </property>

Make sure to restart HBase.

• Create NSes and table

hbase(main):004:0> create_namespace 'testqauat'
0 row(s) in 0.0370 seconds

hbase(main):005:0> create_namespace 'financedept'
0 row(s) in 0.0100 seconds

hbase(main):006:0> create_namespace 'engdept'
0 row(s) in 0.0090 seconds

hbase(main):007:0> create 'testqauat:testtable', 'cf1'
0 row(s) in 1.2590 seconds

=> Hbase::Table - testqauat:testtable
hbase(main):008:0> for i in 'a'..'z' do for j in 'a'..'z' do put 'testqauat:testtable', "row-#{i}#{j}", "cf1:#{j}", "#{j}" end end

• Reload the master UI page and you get:

HTTP ERROR 500

Problem accessing /master-status. Reason:

    INTERNAL_SERVER_ERROR
Caused by:

java.lang.NullPointerException
	at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.__jamon_innerUnit__userTables(MasterStatusTmplImpl.java:685)
	at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.renderNoFlush(MasterStatusTmplImpl.java:268)
	at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.renderNoFlush(MasterStatusTmpl.java:377)
	at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.render(MasterStatusTmpl.java:368)
	at org.apache.hadoop.hbase.master.MasterStatusServlet.doGet(MasterStatusServlet.java:81)
...

Note that the table.jsp page works fine, just the master page fails.