ycsb中mapkeeperclient修改和創建連接

這兩天主要是在最新版本的YCSB的基礎上用mapkeeperclient打包並連接mapkeeper端的server。不得不說ycsb在創建mapkeeper client的時候就是有問題的。我踩了很多坑，我要記下來做筆記。

首先是下載最新的YCSB：

git clone https://github.com/brianfrankcooper/YCSB.git

然後執行下面命令：

cd YCSB
vim pom.xml

在pom.xml文件中把有關mapkeeper的部分取消註釋：

取消註釋部分：
<mapkeeper.version>1.0</mapkeeper.version>
<module>mapkeeper</module>

在mapkeeper目錄下的pom.xml文件中添加：

    <dependency>
        <groupId>org.apache.thrift</groupId>
        <artifactId>libthrift</artifactId>
        <version>0.6.1</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.25</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.25</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.25</version>
    </dependency>

敲黑板的重點是這裏thrift一定要是0.6.1版本的！！！我試過最新0.12.0還有0.8.0都不行。這纔是我這幾天一直mvn打包的時候報錯的原因，如果不用這個會報以下錯誤：

Exception in thread "Thread-2" java.lang.IncompatibleClassChangeError: Implementing class
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at com.yahoo.ycsb.db.MapKeeperClient.init(MapKeeperClient.java:69)
	at com.yahoo.ycsb.DBWrapper.init(DBWrapper.java:86)
	at com.yahoo.ycsb.ClientThread.run(ClientThread.java:91)
	at java.lang.Thread.run(Thread.java:748)

我在網上搜索了好久也不知道上面是啥錯誤，原來是mapkeeper在mvn打包的時候只支持0.6.1版本。然後就是對於MapKeeperClient的修改了，在這裏最新版的MapKeeperClient.java文件中是有一些問題的就是把一些本該是用com.yahoo.ycsb.Status類型的表示用常用的int表示了。所以會報checkstyle的錯誤。同時格式也會不對顯示類似於本該空着幾格實際空了幾格的報錯，因爲可能是tab問題。所以需要手動修改。修改如下完整的mapkeeperclient文件：

/**
 * Copyright (c) 2012 YCSB contributors. All rights reserved.
 * <p>
 * Licensed 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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. See accompanying
 * LICENSE file.
 */
package com.yahoo.ycsb.db;
//import java.nio.CharBuffer;
//import java.util.Arrays;
//import java.nio.charset.Charset;
//import java.nio.charset.CharsetDecoder;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Properties;
import java.util.Set;
import java.util.Vector;
import java.util.Map;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
//import org.apache.commons.codec.binary.Base64;
import com.yahoo.mapkeeper.BinaryResponse;
import com.yahoo.mapkeeper.MapKeeper;
import com.yahoo.mapkeeper.Record;
import com.yahoo.mapkeeper.RecordListResponse;
import com.yahoo.mapkeeper.ResponseCode;
import com.yahoo.mapkeeper.ScanOrder;
import com.yahoo.ycsb.ByteIterator;
import com.yahoo.ycsb.DB;
import com.yahoo.ycsb.StringByteIterator;
import com.yahoo.ycsb.workloads.CoreWorkload;
import com.yahoo.ycsb.Status;
/**
 * YCSB binding for <a href="http://redis.io/">Redis</a>.
 *
 * See {@code redis/README.md} for details.
 */
public class MapKeeperClient extends DB {
  private static final String HOST = "mapkeeper.host";
  private static final String HOST_DEFAULT = "localhost";
  private static final String PORT = "mapkeeper.port";
  private static final String PORT_DEFAULT = "9090";
  private MapKeeper.Client c;
  private boolean writeallfields;
  private static boolean initteddb = false;

  private static synchronized void initDB(Properties p, MapKeeper.Client c) throws TException {
    if (!initteddb) {
      initteddb = true;
      c.addMap(p.getProperty(CoreWorkload.TABLENAME_PROPERTY, CoreWorkload.TABLENAME_PROPERTY_DEFAULT));
    }
  }

  public void init() {
    String host = getProperties().getProperty(HOST, HOST_DEFAULT);
    int port = Integer.parseInt(getProperties().getProperty(PORT, PORT_DEFAULT));
    TTransport tr = new TFramedTransport(new TSocket(host, port));
    TProtocol proto = new TBinaryProtocol(tr);
    c = new MapKeeper.Client(proto);
    try {
      tr.open();
      initDB(getProperties(), c);
    } catch (TException e) {
      throw new RuntimeException(e);
    }
    writeallfields = Boolean.parseBoolean(getProperties().getProperty(CoreWorkload.WRITE_ALL_FIELDS_PROPERTY,
        CoreWorkload.WRITE_ALL_FIELDS_PROPERTY_DEFAULT));
  }

  ByteBuffer encode(HashMap<String, ByteIterator> values) {
    int len = 0;
    for (Map.Entry<String, ByteIterator> entry : values.entrySet()) {
      len += (entry.getKey().length() + 1 + entry.getValue().bytesLeft() + 1);
    }
    byte[] array = new byte[len];
    int i = 0;
    for (Map.Entry<String, ByteIterator> entry : values.entrySet()) {
      for (int j = 0; j < entry.getKey().length(); j++) {
        array[i] = (byte) entry.getKey().charAt(j);
        i++;
      }
      array[i] = '\t';
      // XXX would like to use sane delimiter (null, 254, 255, ...) but java makes this nearly impossible
      i++;
      ByteIterator v = entry.getValue();
      i = v.nextBuf(array, i);
      array[i] = '\t';
      i++;
    }
    array[array.length - 1] = 0;
    ByteBuffer buf = ByteBuffer.wrap(array);
    buf.rewind();
    return buf;
  }

  void decode(Set<String> fields, String tups, HashMap<String, ByteIterator> tup) {
    String[] tok = tups.split("\\t");
    if (tok.length == 0) {
      throw new IllegalStateException("split returned empty array!");
    }
    for (int i = 0; i < tok.length; i += 2) {
      if (fields == null || fields.contains(tok[i])) {
        if (tok.length < i + 2) {
          throw new IllegalStateException("Couldn't parse tuple <" + tups + "> at index " + i);
        }
        if (tok[i] == null || tok[i + 1] == null) {
          throw new NullPointerException("Key is " + tok[i] + " val is + " + tok[i + 1]);
        }
        tup.put(tok[i], new StringByteIterator(tok[i + 1]));
      }
    }
    if (tok.length == 0) {
      System.err.println("Empty tuple: " + tups);
    }
  }


  Status ycsbThriftRet(BinaryResponse succ, ResponseCode zero, ResponseCode one) {
    return ycsbThriftRet(succ.responseCode, zero, one);
  }

  Status ycsbThriftRet(ResponseCode rc, ResponseCode zero, ResponseCode one) {
    System.out.println("rc:"+ rc + "zero" + zero + "one" + one);
    return rc == zero ? Status.OK : rc == one ? Status.NOT_FOUND : Status.ERROR;
  }

  ByteBuffer bufStr(String str) {
    ByteBuffer buf = ByteBuffer.wrap(str.getBytes());
    return buf;
  }

  String strResponse(BinaryResponse buf) {
    try{
      //Convert ByteBuffer to String
      //System.out.println("bb:"+ buf.value.getClass() + Arrays.toString(buf.value.array()));

     // ByteBuffer bb4= ByteBuffer.wrap(buf.value.array());
      //String string = Charset.forName("UTF-8").decode(bb4).toString();

      //String string = new String(buf.value.array(), "GB2312");
      String string = new String(buf.value.array(), "ISO-8859-1");//一定要注意編碼問題
      byte[] ret = string.getBytes("ISO-8859-1");
      String s = "";
      int i =0;
      for(i = 0; i < ret.length - 1; i++) {
        s += Byte.toString(ret[i]) + '\t';
      }
      s += ret[i];
      //System.out.println("string:" + s);
      return s;
    } catch(Exception e){
      e.printStackTrace();
      return "";
    }
  }

//  String getString(BinaryResponse buf) {
//    try {
//      ByteBuffer buffer = buf.value.array();
//      Charset charset = Charset.forName("UTF-8");
//      CharsetDecoder decoder = charset.newDecoder();
//// charBuffer = decoder.decode(buffer);//用這個的話，只能輸出來一次結果，第二次顯示爲空
//      CharBuffer charBuffer = decoder.decode(buffer.asReadOnlyBuffer());
//      return charBuffer.toString();
//    } catch (Exception ex) {
//      ex.printStackTrace();
//      return "";
//    }
//  }


  @Override
  public Status read(String table, String key, Set<String> fields,
                  Map<String, ByteIterator> result) {
    try {
      ByteBuffer buf = bufStr(key);
      BinaryResponse succ = c.get(table, buf);
      Status ret = ycsbThriftRet(
          succ,
          ResponseCode.Success,
          ResponseCode.RecordNotFound);
      System.out.println("succ:" + succ);
      System.out.print("read status" + ret);
      if (ret == Status.OK) {
        System.out.println("str response succ" + succ.value);
        decode(fields, strResponse(succ), (HashMap<String, ByteIterator>)result);
      }
      return ret;
    } catch (TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override
  public Status scan(String table, String startkey, int recordcount,
                  Set<String> fields, Vector<HashMap<String, ByteIterator>> result) {
    try {
      //XXX what to pass in for nulls / zeros?
      RecordListResponse res = c.scan(table, ScanOrder.Ascending, bufStr(startkey), true, null, false, recordcount, 0);
      Status ret = ycsbThriftRet(res.responseCode, ResponseCode.Success, ResponseCode.ScanEnded);
      if (ret == Status.OK) {
        for (Record r : res.records) {
          HashMap<String, ByteIterator> tuple = new HashMap<String, ByteIterator>();
          // Note: r.getKey() and r.getValue() call special helper methods that trim the buffer
          // to an appropriate length, and memcpy it to a byte[].  Trying to manipulate the ByteBuffer
          // directly leads to trouble.
          tuple.put("key", new StringByteIterator(new String(r.getKey())));
          decode(fields, new String(r.getValue())/*strBuf(r.bufferForValue())*/, tuple);
          result.add(tuple);
        }
      }
      return ret;
    } catch (TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override
  public Status update(String table, String key,
                    Map<String, ByteIterator> values) {
    try {
      if (!writeallfields) {
        HashMap<String, ByteIterator> oldval = new HashMap<String, ByteIterator>();
        read(table, key, null, oldval);
        for (Map.Entry<String, ByteIterator> entry : values.entrySet()) {
          oldval.put(entry.getKey(), entry.getValue());
        }
        values = oldval;
      }
      ResponseCode succ = c.update(table, bufStr(key), encode((HashMap<String, ByteIterator>)values));
      return ycsbThriftRet(succ, ResponseCode.Success, ResponseCode.RecordNotFound);
    } catch (TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override
  public Status insert(String table, String key, Map<String, ByteIterator> values) {
    try {
      Status ret = ycsbThriftRet(c.insert(table, bufStr(key), encode((HashMap<String, ByteIterator>)values)),
          ResponseCode.Success, ResponseCode.RecordExists);
      return ret;
    } catch (TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override
  public Status delete(String table, String key) {
    try {
      return ycsbThriftRet(c.remove(table, bufStr(key)), ResponseCode.Success, ResponseCode.RecordExists);
    } catch (TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }
}

同時在該目錄下添加一個package-info.java文件。內容是（雖然很簡單但是對於打包很重要）

package com.yahoo.ycsb.db;

如果在進行mvn clean package的時候報錯如下：（在0.18.0版本之後com.yahoo.ycsb變成site.ycsb因此上面MapKeeperClient中的import com.yahoo.ycsb變成site.ycsb，同時MapKeeperClient和package-info中package變爲site.ycsb.db）

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.5.5:single (default) on project ycsb: Failed to create assembly: Artifact: site.ycsb:mapkeeper-binding:jar:0.18.0-SNAPSHOT (included by module) does not have an artifact with a file. Please ensure the package phase is run before the assembly is generated. 

如果還是報錯嘗試將上面關於mapkeeper的信息註釋掉，排除mapkeeper之後進行mvn clean package，編譯成功後再取消mapkeeper的相關注釋。單獨對mapkeeper進行編譯（命令如下只編譯mapkeeper部分）。

0.18.0之後MapKeeperClient文件應該如下：

/**
 * Copyright (c) 2012 YCSB contributors. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */

package site.ycsb.db;

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Properties;
import java.util.Set;
import java.util.Vector;
import java.util.Map;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import site.ycsb.Status;
import com.yahoo.mapkeeper.BinaryResponse;
import com.yahoo.mapkeeper.Record;
import com.yahoo.mapkeeper.RecordListResponse;
import com.yahoo.mapkeeper.ResponseCode;
import com.yahoo.mapkeeper.ScanOrder;
import com.yahoo.mapkeeper.MapKeeper;
import site.ycsb.ByteIterator;
import site.ycsb.StringByteIterator;
import site.ycsb.DB;
import site.ycsb.workloads.CoreWorkload;
/**
 * Abstract class to adapt the default ycsb DB interface to Timeseries databases.
 * This class is mostly here to be extended by Timeseries dataabases
 * originally developed by Andreas Bader in <a href="https://github.com/TSDBBench/YCSB-TS">YCSB-TS</a>.
 * <p>
 * This class is mostly parsing the workload information passed through the default ycsb interface
 * according to the information outlined in {@link TimeSeriesWorkload}.
 * It also contains some minor utility methods relevant to Timeseries databases.
 * </p>
 * implSpec It's vital to call <tt>super.init()</tt> when overwriting the init method
 * to correctly initialize the workload-parsing.
 */
public class MapKeeperClient extends DB {
  private static final String HOST = "mapkeeper.host";
  private static final String HOST_DEFAULT = "localhost";
  private static final String PORT = "mapkeeper.port";
  private static final String PORT_DEFAULT = "9090";
  private MapKeeper.Client c; 
  private boolean writeallfields;
  private static boolean initteddb = false;
  private static synchronized void initDB(Properties p, MapKeeper.Client c) throws TException {
    if(!initteddb) {
      initteddb = true;
      c.addMap(p.getProperty(CoreWorkload.TABLENAME_PROPERTY, CoreWorkload.TABLENAME_PROPERTY_DEFAULT));
    }
  }
  public void init() {
    String host = getProperties().getProperty(HOST, HOST_DEFAULT);
    int port = Integer.parseInt(getProperties().getProperty(PORT, PORT_DEFAULT));
    TTransport tr = new TFramedTransport(new TSocket(host, port));
    TProtocol proto = new TBinaryProtocol(tr);
    c = new MapKeeper.Client(proto);
    try {
      tr.open();
      initDB(getProperties(), c);
    } catch(TException e) {
      throw new RuntimeException(e);
    }
    writeallfields = Boolean.parseBoolean(getProperties().getProperty(CoreWorkload.WRITE_ALL_FIELDS_PROPERTY, 
                    CoreWorkload.WRITE_ALL_FIELDS_PROPERTY_DEFAULT));
  }
  ByteBuffer encode(Map<String, ByteIterator> values) {
    int len = 0;
    for(Map.Entry<String, ByteIterator> entry : values.entrySet()) {
      len += (entry.getKey().length() + 1 + entry.getValue().bytesLeft() + 1);
    }
    byte[] array = new byte[len];
    int i = 0;
    for(Map.Entry<String, ByteIterator> entry : values.entrySet()) {
      for(int j = 0; j < entry.getKey().length(); j++) {
        array[i] = (byte)entry.getKey().charAt(j);
        i++;
      }
      array[i] = '\t'; // XXX would like to use sane delimiter (null, 254,..) but java makes this nearly impossible
      i++;
      ByteIterator v = entry.getValue();
      i = v.nextBuf(array, i);
      array[i] = '\t';
      i++;
    }
    array[array.length-1] = 0;
    ByteBuffer buf = ByteBuffer.wrap(array);
    buf.rewind();
    return buf;
  }
  void decode(Set<String> fields, String tups, Map<String, ByteIterator> tup) {
    String[] tok = tups.split("\\t");
    if(tok.length == 0) { 
      throw new IllegalStateException("split returned empty array!"); 
    }
    for(int i = 0; i < tok.length; i+=2) {
      if(fields == null || fields.contains(tok[i])) {
        if(tok.length < i+2) { 
          throw new IllegalStateException("Couldn't parse tuple <" + tups + "> at index " + i); 
        }
        if(tok[i] == null || tok[i+1] == null) {
          throw new NullPointerException("Key is " + tok[i] + " val is + " + tok[i+1]);
        }
        tup.put(tok[i], new StringByteIterator(tok[i+1]));
      }
    }
    if(tok.length == 0) {
      System.err.println("Empty tuple: " + tups);
    }
  }

  int ycsbThriftRet(BinaryResponse succ, ResponseCode zero, ResponseCode one) {
    return ycsbThriftRet(succ.responseCode, zero, one);
  }
  int ycsbThriftRet(ResponseCode rc, ResponseCode zero, ResponseCode one) {
    return
        rc == zero ? 0 :
        rc == one  ? 1 : 2;
  }
  ByteBuffer bufStr(String str) {
    ByteBuffer buf = ByteBuffer.wrap(str.getBytes());
    return buf;
  }
  String strResponse(BinaryResponse buf) {
    return new String(buf.value.array());
  }
  @Override
  public Status read(String table, String key, Set<String> fields,
      Map<String, ByteIterator> result) {
    try {
      ByteBuffer buf = bufStr(key);

      BinaryResponse succ = c.get(table, buf);

      int ret = ycsbThriftRet(
                    succ,
                    ResponseCode.RecordExists,
                    ResponseCode.RecordNotFound);

      if(ret == 0) {
        decode(fields, strResponse(succ), result);
      }
      return ret == 2 ? Status.OK : (ret == 0 ? Status.ERROR: Status.NOT_FOUND);
    } catch(TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override
  public Status scan(String table, String startkey, int recordcount,
            Set<String> fields, Vector<HashMap<String, ByteIterator>> result) {
    try {
        //XXX what to pass in for nulls / zeros?
      RecordListResponse res = c.scan(table, ScanOrder.Ascending, bufStr(startkey), true, null, false, recordcount, 0);
      int ret = ycsbThriftRet(res.responseCode, ResponseCode.Success, ResponseCode.ScanEnded);
      if(ret == 0) {
        for(Record r : res.records) {
          HashMap<String, ByteIterator> tuple = new HashMap<String, ByteIterator>();
            // Note: r.getKey() and r.getValue() call special helper methods that trim the buffer
            // to an appropriate length, and memcpy it to a byte[].  Trying to manipulate the ByteBuffer
            // directly leads to trouble.
          tuple.put("key", new StringByteIterator(new String(r.getKey())));
          decode(fields, new String(r.getValue())/*strBuf(r.bufferForValue())*/, tuple);
          result.add(tuple);
        }
      }
      return ret == 0 ? Status.OK : (ret == 2 ? Status.ERROR: Status.NOT_FOUND);
    } catch(TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override
  public Status update(String table, String key,
            Map<String, ByteIterator> values) {
    try {
      if(!writeallfields) {
        HashMap<String, ByteIterator> oldval = new HashMap<String, ByteIterator>();
        read(table, key, null, oldval);
        for(Map.Entry<String, ByteIterator> entry : values.entrySet()) {
          oldval.put(entry.getKey(), entry.getValue());
        }
        values = oldval;
      }
      ResponseCode succ = c.update(table, bufStr(key), encode(values));
      int ret =  ycsbThriftRet(succ, ResponseCode.RecordExists, ResponseCode.RecordNotFound);
      return ret == 2 ? Status.OK : (ret == 0 ? Status.ERROR: Status.NOT_FOUND);
    } catch(TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override
  public Status insert(String table, String key,
            Map<String, ByteIterator> values) {
    try {
      int r = 0;
      r = ycsbThriftRet(c.insert(table, bufStr(key), encode(values)), ResponseCode.Success, ResponseCode.RecordExists);
      return r == 0 ? Status.OK : (r == 1 ? Status.ERROR: Status.NOT_FOUND);
    } catch(TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }

  @Override 
  public Status delete(String table, String key) {
    try {
      int ret = ycsbThriftRet(c.remove(table, bufStr(key)), ResponseCode.Success, ResponseCode.RecordExists);
      return ret == 0 ? Status.OK : (ret == 1 ? Status.ERROR: Status.NOT_FOUND);
    } catch(TException e) {
      e.printStackTrace();
      return Status.ERROR;
    }
  }
}

使用mvn打包：

編譯所有數據庫的話：
mvn clean package
只編譯mapkeeper的話（0.17版本以及之前）：
mvn -pl com.yahoo.ycsb:mapkeeper-binding -am clean package
只編譯mapkeeper的話（0.18版本）：
mvn -pl site.ycsb:mapkeeper-binding -am clean package

然後就可以編譯成功了。

然後就是修改YCSB/bin中的bindings.properties：

#添加
mapkeeper:com.yahoo.ycsb.db.MapKeeperClient

然後就是修改YCSB/bin中的ycsb：

#添加
"mapkeeper"    : "com.yahoo.ycsb.db.MapKeeperClient",

然後就大功告成了，在client端：

bin/ycsb load mapkeeper -s -P workloads/workloada -p "mapkeeper.host=127.0.0.1" -p "mapkeeper.port=9090"
bin/ycsb run mapkeeper -s -P workloads/workloada -p "mapkeeper.host=127.0.0.1" -p "mapkeeper.port=9090"

如果執行上面命令出現報錯是因爲系統使用的python版本是python 3.X，如果使用python2.X就會正常運行，可以通過在ycsb文件中修改#!/usr/bin/env python爲#!/usr/bin/env python2即可，但是要確保系統是有python2.X的纔可以做這樣的修改：

  File "bin/ycsb", line 226
    except subprocess.CalledProcessError, err:

在mapkeeper server端開啓：

./mapkeeper_RHDB 0 1 1 /home/clever_wr/data

不報錯就顯示成功連接