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Server functionality for HBase
<%--
/**
* Licensed to the Apache Software Foundation (ASF) under one
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* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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* See the License for the specific language governing permissions and
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--%>
<%@ page contentType="text/html;charset=UTF-8"
import="java.util.Date"
import="java.util.List"
import="org.apache.hadoop.conf.Configuration"
import="org.apache.hadoop.hbase.client.Admin"
import="org.apache.hadoop.hbase.master.HMaster"
import="org.apache.hadoop.util.StringUtils"
import="org.apache.hadoop.hbase.client.ServerType"
import="org.apache.hadoop.hbase.client.LogEntry"
import="org.apache.hadoop.hbase.client.BalancerRejection"
import="org.apache.hadoop.hbase.client.BalancerDecision"
%>
<%
HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
Configuration conf = master.getConfiguration();
List logList = null;
List decisionList = null;
if(master.isInitialized()) {
try (Admin admin = master.getConnection().getAdmin()) {
logList = (List)(List)admin.getLogEntries(null, "BALANCER_REJECTION", ServerType.MASTER, 250, null);
decisionList = (List)(List)admin.getLogEntries(null, "BALANCER_DECISION", ServerType.MASTER, 250, null);
}
}
%>
Operations Details
HBase uses some fixed-size ring buffers to maintain rolling window history of specific server-side operation details.
This page list all operation details retrieve from these ring buffers
Balancer Rejection explain why balancer is skipping runs and explain all factors considered
Reason
CostFunctions Details
<% if (logList == null) { %>
<% } else { %>
<% for (BalancerRejection entry: logList) { %>
<%=entry.getReason()%>
<% List costFunctions = entry.getCostFuncInfoList();
if (costFunctions != null && !costFunctions.isEmpty()) { %>
<% for (String costFunctionInfo: entry.getCostFuncInfoList() ) { %>
<%= costFunctionInfo %>
<% } %>
<% } %>
<% } %>
Balancer Decision displayed the history of decision(factor details and weights and costs) made by LoadBalancers
Initial Function Costs
Final Function Costs
Init Total Cost
Computed Total Cost
Computed Steps
Region Plans
<% if (decisionList == null) { %>
<% } else { %>
<% for (BalancerDecision decision: decisionList) { %>
<%=decision.getInitialFunctionCosts()%>
<%=decision.getFinalFunctionCosts()%>
<%=StringUtils.format("%.2f", decision.getInitTotalCost())%>
<%=StringUtils.format("%.2f", decision.getComputedTotalCost())%>
<%=decision.getComputedSteps()%>
<%
List regionPlans = decision.getRegionPlans();
if ( regionPlans == null) {%>
<% for (String plan : regionPlans) { %>
<%=plan%>
<% } %>
<% } %>
<% } %>
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