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Server functionality for HBase
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<%--
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * 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
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
--%>
<%@ page contentType="text/html;charset=UTF-8"
  import="java.util.concurrent.TimeUnit"
  import="java.util.ArrayList"
  import="java.util.List"
  import="org.apache.hadoop.conf.Configuration"
  import="org.apache.hadoop.hbase.master.HMaster"
  import="org.apache.hadoop.hbase.quotas.MasterQuotaManager"
  import="org.apache.hadoop.hbase.quotas.QuotaRetriever"
  import="org.apache.hadoop.hbase.quotas.QuotaSettings"
  import="org.apache.hadoop.hbase.quotas.ThrottleSettings"
%>
<%
  HMaster master = (HMaster) getServletContext().getAttribute(HMaster.MASTER);
  Configuration conf = master.getConfiguration();
  pageContext.setAttribute("pageTitle", "HBase Master Quotas: " + master.getServerName());
  List regionServerThrottles = new ArrayList<>();
  List namespaceThrottles = new ArrayList<>();
  List userThrottles = new ArrayList<>();
  MasterQuotaManager quotaManager = master.getMasterQuotaManager();
  boolean exceedThrottleQuotaEnabled = false;
  if (quotaManager != null) {
    exceedThrottleQuotaEnabled = quotaManager.isExceedThrottleQuotaEnabled();
    try (QuotaRetriever scanner = QuotaRetriever.open(conf, null)) {
      for (QuotaSettings quota : scanner) {
        if (quota instanceof ThrottleSettings) {
          ThrottleSettings throttle = (ThrottleSettings) quota;
          if (throttle.getUserName() != null) {
            userThrottles.add(throttle);
          } else if (throttle.getNamespace() != null) {
            namespaceThrottles.add(throttle);
          } else if (throttle.getRegionServer() != null) {
            regionServerThrottles.add(throttle);
          }
        }
      }
    }
  }
%>

    


  
    
      Throttle Quotas
    
  


<%if (quotaManager != null) {%>


  
    
      Rpc Throttle Enabled
    
  
  <%if (quotaManager.isRpcThrottleEnabled()) {%>
  
    Rpc throttle is enabled.
  
  <% } else {%>
  
    Rpc throttle is disabled. All requests will not be throttled.

    Use 'enable_rpc_throttle' shell command to enable it.
  
  <% } %>



  
    
      Exceed Throttle Quota Enabled
    
  
  <%if (exceedThrottleQuotaEnabled) {%>
  
    Exceed throttle quota is enabled. The user/table/namespace throttle quotas can exceed the limit
    if a region server has available quotas.

    Use 'disable_exceed_throttle_quota' shell command to disable it.
  
  <% } else {%>
  
    Exceed throttle quota is disabled.
  
  <% } %>



  
    
      RegionServer Throttle Quotas
    
  
<%
  if (regionServerThrottles.size() > 0) {
%>
  
    <% for (ThrottleSettings throttle : regionServerThrottles) { %>
      
        <% if (exceedThrottleQuotaEnabled && throttle.getTimeUnit() != null && throttle.getTimeUnit() != TimeUnit.SECONDS) { %>
        
        <% }%>
      
    <% } %>
  
    
      RegionServer
      Limit
      Type
      TimeUnit
      Scope
    

        <%= throttle.getRegionServer() == null ? "" : throttle.getRegionServer() %>
        <%= throttle.getSoftLimit() %>
        <%= throttle.getThrottleType() %>
        <%= throttle.getTimeUnit() %>
        <%= throttle.getQuotaScope() %> Exceed throttle quota is enabled, but RegionServer throttle is not in SECONDS time unit.
  <% } else if (exceedThrottleQuotaEnabled) { %>
  
    Exceed throttle quota is enabled, but RegionServer throttle quotas are not set.

    Please set RegionServer read and write throttle quotas in SECONDS time unit.

    eg. set_quota TYPE => THROTTLE, REGIONSERVER => 'all', THROTTLE_TYPE => WRITE, LIMIT => '20000req/sec'
  
  <%}%>



  
    
      Namespace Throttle Quotas
    
  
  <%
    if (namespaceThrottles.size() > 0) {
  %>
  
    <% for (ThrottleSettings throttle : namespaceThrottles) { %>
    
    <% } %>
  
    
      Namespace
      Limit
      Type
      TimeUnit
      Scope
    

      <%= throttle.getNamespace() == null ? "" : throttle.getNamespace() %>
      <%= throttle.getSoftLimit() %>
      <%= throttle.getThrottleType() %>
      <%= throttle.getTimeUnit() %>
      <%= throttle.getQuotaScope() %>
    
  <% } %>



  
    
      User Throttle Quotas
    
  
  <%
    if (userThrottles.size() > 0) {
  %>
  
    <% for (ThrottleSettings throttle : userThrottles) { %>
    
    <% } %>
  
    
      User
      Namespace
      Table
      Limit
      Type
      TimeUnit
      Scope
    

      <%= throttle.getUserName() == null ? "" : throttle.getUserName() %>
      <%= throttle.getNamespace() == null ? "" : throttle.getNamespace() %>
      <%= throttle.getTableName() == null ? "" : throttle.getTableName() %>
      <%= throttle.getSoftLimit() %>
      <%= throttle.getThrottleType() %>
      <%= throttle.getTimeUnit() %>
      <%= throttle.getQuotaScope() %>
    
  <% } %>


<% } %>