infraio commented on a change in pull request #373: HBASE-22527 [hbck2] Add a 
master web ui to show the problematic regions
URL: https://github.com/apache/hbase/pull/373#discussion_r304727389
 
 

 ##########
 File path: 
hbase-server/src/main/jamon/org/apache/hadoop/hbase/tmpl/master/AssignmentManagerStatusTmpl.jamon
 ##########
 @@ -17,27 +17,98 @@ See the License for the specific language governing 
permissions and
 limitations under the License.
 </%doc>
 <%import>
-org.apache.hadoop.hbase.master.assignment.AssignmentManager;
-org.apache.hadoop.hbase.master.assignment.AssignmentManager.RegionInTransitionStat;
-org.apache.hadoop.hbase.master.assignment.RegionStates.RegionFailedOpen;
-org.apache.hadoop.hbase.master.RegionState;
+java.util.Map;
+java.util.Set;
+java.util.SortedSet;
+java.util.concurrent.atomic.AtomicInteger;
+java.util.stream.Collectors;
 org.apache.hadoop.conf.Configuration;
 org.apache.hadoop.hbase.HBaseConfiguration;
 org.apache.hadoop.hbase.HConstants;
+org.apache.hadoop.hbase.ServerName;
+org.apache.hadoop.hbase.client.RegionInfo;
 org.apache.hadoop.hbase.client.RegionInfoDisplay;
-java.util.HashSet;
-java.util.SortedSet;
-java.util.Map;
-java.util.concurrent.atomic.AtomicInteger;
+org.apache.hadoop.hbase.master.RegionState;
+org.apache.hadoop.hbase.master.assignment.AssignmentManager;
+org.apache.hadoop.hbase.master.assignment.AssignmentManager.RegionInTransitionStat;
+org.apache.hadoop.hbase.master.assignment.RegionStates.RegionFailedOpen;
+org.apache.hadoop.hbase.util.Pair;
 </%import>
 <%args>
 AssignmentManager assignmentManager;
 int limit = 100;
 </%args>
 
-<%java SortedSet<RegionState> rit = assignmentManager
-  .getRegionStates().getRegionsInTransitionOrderedByTimestamp();
-%>
+<%java>
+SortedSet<RegionState> rit = assignmentManager.getRegionStates()
+    .getRegionsInTransitionOrderedByTimestamp();
+Map<String, Pair<ServerName, Set<ServerName>>> problematicRegions = 
assignmentManager
+    .getProblematicRegions();
+</%java>
+
+<%if !problematicRegions.isEmpty() %>
+<%java>
+int totalSize = problematicRegions.size();
+int sizePerPage = Math.min(10, totalSize);
+int numOfPages = (int) Math.ceil(totalSize * 1.0 / sizePerPage);
+</%java>
+    <section>
+    <h2><a name="rit">Problematic Regions</a></h2>
 
 Review comment:
   Already committed it. Will add addendum for this.

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