hadoop文件系统错误could only be replicated to 0 nodes, instead of 1解决方法

当hadoop fs的datanode容量不够时会发生如下错误：

org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /usr/local/hadoop/tmp/mapred/staging/root/.staging/job_201505120913_0004/libjars/hive-builtins-0.9.0.jar could only be replicated to 0 nodes, instead of 1
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1639)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:736)
        at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:578)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1393)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1389)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1387)


        at org.apache.hadoop.ipc.Client.call(Client.java:1107)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)
        at $Proxy6.addBlock(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:85)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:62)
        at $Proxy6.addBlock(Unknown Source)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3686)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3546)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2600(DFSClient.java:2749)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2989)

  验证方式：命令行下严重文件系统的容量使用情况

[root@hadoop0 apache_logs]# df -hl

文件系统              容量  已用 可用 已用% 挂载点
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root
                      5.5G  4.7G  586M  89% /
tmpfs                 144M  224K  144M   1% /dev/shm
/dev/sda1             485M   32M  428M   7% /boot

查看你配置的core-site.xml中的hadoop.tmp.dir属性值，如果设置的缓存数据交换的空间不够，操作datanode就会发生如上错误，选择配置容量大的目录

    <property>
        <name>hadoop.tmp.dir</name>
        <value>/usr/local/hadoop/tmp</value>
    </property>