%@ page contentType="text/html;charset=UTF-8"
import="java.util.List"
import="java.util.regex.*"
import="org.apache.hadoop.hbase.RegionHistorian"
import="org.apache.hadoop.hbase.master.HMaster"
import="org.apache.hadoop.hbase.RegionHistorian.RegionHistoryInformation"
import="org.apache.hadoop.hbase.HConstants"%><%
String regionName = request.getParameter("regionname");
HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
List informations = RegionHistorian.getInstance().getRegionHistory(regionName);
// Pattern used so we can wrap a regionname in an href.
Pattern pattern = Pattern.compile(RegionHistorian.SPLIT_PREFIX + "(.*)$");
%>
Region in <%= regionName %>
<% for( RegionHistoryInformation information : informations) {
String description = information.getDescription();
Matcher m = pattern.matcher(description);
if (m.matches()) {
// Wrap the region name in an href so user can click on it.
description = RegionHistorian.SPLIT_PREFIX +
"" +
m.group(1) + "";
}
%>
<%= information.getTimestampAsString() %>
<%= information.getEvent() %>
<%= description %>
<% } %>
Master is the source of following events: creation, open, and assignment. Regions are the source of following events: split, compaction, and flush.
<%} else {%>
This region is no longer available. It may be due to a split, a merge or the name changed.