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我是ceph的新手。我有一个 5 节点集群（ubuntu 14.04），我在其中设置了 Hadoop（1.1.1）和 ceph（v0.87）。我想将 Hadoop 与 cephFS 一起使用并进行一些实验。我使用正常的 hadoop 设置运行了 wordcount 示例，它运行良好。ceph 集群健康也正常。但是，当我按照“将 Hadoop 与 CephFS 一起使用”文档http://ceph.com/docs/master/cephfs/hadoop/中提到的那样更改 Hadoop 配置时，我遇到了以下错误（我已经安装了带有内核驱动程序的 cephfs /mnt/mycephfs):

ceph@admin-node:/usr/local/hadoop-1.1.1$ bin/hadoop jar hadoop-examples-1.1.1.jar wordcount /mnt/mycephfs/wc-input /mnt/mycephfs/wc-output-425

15/04/14 20:47:00 INFO util.NativeCodeLoader: Loaded the native-hadoop library
15/04/14 20:47:00 INFO input.FileInputFormat: Total input paths to process : 1
15/04/14 20:47:00 WARN snappy.LoadSnappy: Snappy native library not loaded
15/04/14 20:47:01 INFO mapred.JobClient: Running job: job_201504142046_0001
15/04/14 20:47:02 INFO mapred.JobClient:  map 0% reduce 0%
15/04/14 20:47:03 INFO mapred.JobClient: Task Id : attempt_201504142046_0001_m_000021_0, Status : FAILED
Error initializing attempt_201504142046_0001_m_000021_0:
java.io.FileNotFoundException: File file:/app/hadoop/tmp/mapred/system/job_201504142046_0001/jobToken does not exist.
        at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:397)
        at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
        at org.apache.hadoop.mapred.TaskTracker.localizeJobTokenFile(TaskTracker.java:4445)
        at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1272)
        at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1213)
        at org.apache.hadoop.mapred.TaskTracker$5.run(TaskTracker.java:2568)
        at java.lang.Thread.run(Thread.java:745)

15/04/14 20:47:03 WARN mapred.JobClient: Error reading task outputhttp://node2:50060/tasklog?plaintext=true&attemptid=attempt_201504142046_0001_m_000021_0&filter=stdout
15/04/14 20:47:03 WARN mapred.JobClient: Error reading task outputhttp://node2:50060/tasklog?plaintext=true&attemptid=attempt_201504142046_0001_m_000021_0&filter=stderr
15/04/14 20:47:03 INFO mapred.JobClient: Task Id : attempt_201504142046_0001_r_000002_0, Status : FAILED
Error initializing attempt_201504142046_0001_r_000002_0:
java.io.FileNotFoundException: File file:/app/hadoop/tmp/mapred/system/job_201504142046_0001/jobToken does not exist.
        at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:397)
        at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
        at org.apache.hadoop.mapred.TaskTracker.localizeJobTokenFile(TaskTracker.java:4445)
        at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1272)
        at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1213)
        at org.apache.hadoop.mapred.TaskTracker$5.run(TaskTracker.java:2568)
        at java.lang.Thread.run(Thread.java:745) 

15/04/14 20:47:03 WARN mapred.JobClient: Error reading task outputhttp://node3:50060/tasklog?plaintext=true&attemptid=attempt_201504142046_0001_m_000021_1&filter=stdout
15/04/14 20:47:03 WARN mapred.JobClient: Error reading task outputhttp://node3:50060/tasklog?plaintext=true&attemptid=attempt_201504142046_0001_m_000021_1&filter=stderr
15/04/14 20:47:04 INFO mapred.JobClient: Task Id : attempt_201504142046_0001_r_000002_1, Status : FAILED
Error initializing attempt_201504142046_0001_r_000002_1:
java.io.FileNotFoundException: File file:/app/hadoop/tmp/mapred/system/job_201504142046_0001/jobToken does not exist.
        at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:397)
        at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
        at org.apache.hadoop.mapred.TaskTracker.localizeJobTokenFile(TaskTracker.java:4445)
        at org.apache.hadoop.mapred.TaskTracker.initializeJob(TaskTracker.java:1272)
        at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:1213)
        at org.apache.hadoop.mapred.TaskTracker$5.run(TaskTracker.java:2568)
        at java.lang.Thread.run(Thread.java:745)
.....................

使用 cephFS 而不是 HDFS 只需要 mapred 守护进程，因此只有 jobtracker 和 tasktracker 在节点中运行（1 个 jobtracker，4 个 tasktracker）。我的 Hadoop 的 core-site.xml 文件：（删除 hadoop.tmp.dir 已在另一个问题中建议并不能解决问题）

<configuration>


<property>
<name>fs.defaultFS</name>
<value>ceph://10.242.144.225:6789/</value>
</property>

<property>
<name>ceph.root.dir</name>
<value>/mnt/mycephfs</value>
</property>

<property>
<name>ceph.conf.file</name>
<value>/etc/ceph/ceph.conf</value>
</property>

<property>
<name>ceph.data.pools</name>
<value>data</value>
</property>

<property>
<name>fs.AbstractFileSystem.ceph.impl</name>
<value>org.apache.hadoop.fs.ceph.CephFs</value>
</property>

<property>
<name>fs.ceph.impl</name>
<value>org.apache.hadoop.fs.ceph.CephFileSystem</value>
</property>

</configuration>

mapred-site.xml 是：

<configuration>
<property>
  <name>mapred.job.tracker</name>
  <value>10.242.144.212:54311</value>
  <description>The host and port that the MapReduce job tracker runs
  at.  Provide the ip address of your master node. The port number must be 54311 or 8021.
  </description>
</property>

<property>
<name>fs.defaultFS</name>
<value>ceph://10.242.144.225:6789/</value>
</property>

</configuration>

请让我知道我在哪里犯了错误。非常感谢这方面的任何帮助。

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