hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServerCommandLine.java

   1 /**
   2  *
   3  * Licensed to the Apache Software Foundation (ASF) under one
   4  * or more contributor license agreements.  See the NOTICE file
   5  * distributed with this work for additional information
   6  * regarding copyright ownership.  The ASF licenses this file
   7  * to you under the Apache License, Version 2.0 (the
   8  * "License"); you may not use this file except in compliance
   9  * with the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19 package org.apache.hadoop.hbase.regionserver;
  20
  21 import org.apache.hadoop.conf.Configuration;
  22 import org.apache.hadoop.hbase.HConstants;
  23 import org.apache.hadoop.hbase.LocalHBaseCluster;
  24 import org.apache.hadoop.hbase.util.ServerCommandLine;
  25 import org.apache.yetus.audience.InterfaceAudience;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 /**
  30  * Class responsible for parsing the command line and starting the
  31  * RegionServer.
  32  */
  33 @InterfaceAudience.Private
  34 public class HRegionServerCommandLine extends ServerCommandLine {
  35   private static final Logger LOG = LoggerFactory.getLogger(HRegionServerCommandLine.class);
  36
  37   private final Class<? extends HRegionServer> regionServerClass;
  38
  39   private static final String USAGE =
  40     "Usage: HRegionServer [-D conf.param=value] start";
  41
  42   public HRegionServerCommandLine(Class<? extends HRegionServer> clazz) {
  43     this.regionServerClass = clazz;
  44   }
  45
  46   @Override
  47   protected String getUsage() {
  48     return USAGE;
  49   }
  50
  51   private int start() throws Exception {
  52     Configuration conf = getConf();
  53     try {
  54       // If 'local', don't start a region server here. Defer to
  55       // LocalHBaseCluster. It manages 'local' clusters.
  56       if (LocalHBaseCluster.isLocal(conf)) {
  57         LOG.warn("Not starting a distinct region server because "
  58             + HConstants.CLUSTER_DISTRIBUTED + " is false");
  59       } else {
  60         logProcessInfo(getConf());
  61         HRegionServer hrs = HRegionServer.constructRegionServer(regionServerClass, conf);
  62         hrs.start();
  63         hrs.join();
  64         if (hrs.isAborted()) {
  65           throw new RuntimeException("HRegionServer Aborted");
  66         }
  67       }
  68     } catch (Throwable t) {
  69       LOG.error("Region server exiting", t);
  70       return 1;
  71     }
  72     return 0;
  73   }
  74
  75   @Override
  76   public int run(String args[]) throws Exception {
  77     if (args.length != 1) {
  78       usage(null);
  79       return 1;
  80     }
  81
  82     String cmd = args[0];
  83
  84     if ("start".equals(cmd)) {
  85       return start();
  86     } else if ("stop".equals(cmd)) {
  87       System.err.println(
  88         "To shutdown the regionserver run " +
  89         "hbase-daemon.sh stop regionserver or send a kill signal to " +
  90         "the regionserver pid");
  91       return 1;
  92     } else {
  93       usage("Unknown command: " + args[0]);
  94       return 1;
  95     }
  96   }
  97 }