Hello!
I built a hadoop cluster including 12 nodes which is based on arm(cubietruck), 
I run simple program wordcount to find how many words of h in hello, it runs 
perfectly. But I run a mutiple program like pi,i run like this:
./hadoop jar hadoop-example-0.21.0.jar pi 100 1000000000
infomation
15/07/18 11:38:54 WARN conf.Configuration: DEPRECATED: hadoop-site.xml found in 
the classpath. Usage of hadoop-site.xml is deprecated. Instead use 
core-site.xml, mapred-site.xml and hdfs-site.xml to override properties of 
core-default.xml, mapred-default.xml and hdfs-default.xml respectively
15/07/18 11:38:54 INFO security.Groups: Group mapping 
impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping; cacheTimeout=300000
15/07/18 11:38:55 WARN conf.Configuration: mapred.task.id is deprecated. 
Instead, use mapreduce.task.attempt.id
15/07/18 11:38:55 WARN mapreduce.JobSubmitter: Use GenericOptionsParser for 
parsing the arguments. Applications should implement Tool for the same.
15/07/18 11:38:55 INFO input.FileInputFormat: Total input paths to process : 1
15/07/18 11:38:58 WARN conf.Configuration: mapred.map.tasks is deprecated. 
Instead, use mapreduce.job.maps
15/07/18 11:38:58 INFO mapreduce.JobSubmitter: number of splits:1
15/07/18 11:38:58 INFO mapreduce.JobSubmitter: adding the following namenodes' 
delegation tokens:null
15/07/18 11:38:59 INFO mapreduce.Job: Running job: job_201507181137_0001
15/07/18 11:39:00 INFO mapreduce.Job:  map 0% reduce 0%
15/07/18 11:39:20 INFO mapreduce.Job:  map 100% reduce 0%
15/07/18 11:39:35 INFO mapreduce.Job:  map 100% reduce 10%
15/07/18 11:39:36 INFO mapreduce.Job:  map 100% reduce 20%
15/07/18 11:39:38 INFO mapreduce.Job:  map 100% reduce 90%
15/07/18 11:39:58 INFO mapreduce.Job:  map 100% reduce 100%
15/07/18 11:49:47 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 11:49:49 INFO mapreduce.Job:  map 100% reduce 19%
15/07/18 11:49:54 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000000_0, Status : FAILED
Task attempt_201507181137_0001_r_000000_0 failed to report status for 602 
seconds. Killing!
15/07/18 11:49:57 WARN mapreduce.Job: Error reading task outputhadoop-slave7
15/07/18 11:49:57 WARN mapreduce.Job: Error reading task outputhadoop-slave7
15/07/18 11:49:58 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000002_0, Status : FAILED
Task attempt_201507181137_0001_r_000002_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:00 WARN mapreduce.Job: Error reading task outputhadoop-slave5
15/07/18 11:50:00 WARN mapreduce.Job: Error reading task outputhadoop-slave5
15/07/18 11:50:00 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000003_0, Status : FAILED
Task attempt_201507181137_0001_r_000003_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:03 WARN mapreduce.Job: Error reading task outputhadoop-slave12
15/07/18 11:50:03 WARN mapreduce.Job: Error reading task outputhadoop-slave12
15/07/18 11:50:03 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000004_0, Status : FAILED
Task attempt_201507181137_0001_r_000004_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:06 WARN mapreduce.Job: Error reading task outputhadoop-slave8
15/07/18 11:50:06 WARN mapreduce.Job: Error reading task outputhadoop-slave8
15/07/18 11:50:06 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000007_0, Status : FAILED
Task attempt_201507181137_0001_r_000007_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:08 WARN mapreduce.Job: Error reading task outputhadoop-slave11
15/07/18 11:50:08 WARN mapreduce.Job: Error reading task outputhadoop-slave11
15/07/18 11:50:08 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000008_0, Status : FAILED
Task attempt_201507181137_0001_r_000008_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:11 WARN mapreduce.Job: Error reading task outputhadoop-slave9
15/07/18 11:50:11 WARN mapreduce.Job: Error reading task outputhadoop-slave9
15/07/18 11:50:11 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000009_0, Status : FAILED
Task attempt_201507181137_0001_r_000009_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:13 WARN mapreduce.Job: Error reading task outputhadoop-slave4
15/07/18 11:50:13 WARN mapreduce.Job: Error reading task outputhadoop-slave4
15/07/18 11:50:13 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000006_0, Status : FAILED
Task attempt_201507181137_0001_r_000006_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:16 WARN mapreduce.Job: Error reading task outputhadoop-slave6
15/07/18 11:50:16 WARN mapreduce.Job: Error reading task outputhadoop-slave6
15/07/18 11:50:16 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000005_0, Status : FAILED
Task attempt_201507181137_0001_r_000005_0 failed to report status for 601 
seconds. Killing!
15/07/18 11:50:18 WARN mapreduce.Job: Error reading task outputhadoop-slave1
15/07/18 11:50:18 WARN mapreduce.Job: Error reading task outputhadoop-slave1
15/07/18 11:50:19 INFO mapreduce.Job:  map 100% reduce 100%
15/07/18 11:50:28 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000001_0, Status : FAILED
Task attempt_201507181137_0001_r_000001_0 failed to report status for 602 
seconds. Killing!
15/07/18 11:50:30 WARN mapreduce.Job: Error reading task outputhadoop-slave2
15/07/18 11:50:30 WARN mapreduce.Job: Error reading task outputhadoop-slave2
15/07/18 11:50:46 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 11:50:50 INFO mapreduce.Job:  map 100% reduce 79%
15/07/18 11:50:54 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000000_1, Status : FAILED
Task attempt_201507181137_0001_r_000000_1 failed to report status for 600 
seconds. Killing!
15/07/18 11:50:57 WARN mapreduce.Job: Error reading task outputhadoop-slave10
15/07/18 11:50:57 WARN mapreduce.Job: Error reading task outputhadoop-slave10
15/07/18 11:50:58 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000001_1, Status : FAILED
Task attempt_201507181137_0001_r_000001_1 failed to report status for 601 
seconds. Killing!
15/07/18 11:51:01 WARN mapreduce.Job: Error reading task outputhadoop-slave3
15/07/18 11:51:01 WARN mapreduce.Job: Error reading task outputhadoop-slave3
15/07/18 11:51:11 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 11:51:17 INFO mapreduce.Job:  map 100% reduce 100%
15/07/18 12:00:21 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 12:00:22 INFO mapreduce.Job:  map 100% reduce 59%
15/07/18 12:00:24 INFO mapreduce.Job:  map 100% reduce 49%
15/07/18 12:00:25 INFO mapreduce.Job:  map 100% reduce 19%
15/07/18 12:00:29 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000007_1, Status : FAILED
Task attempt_201507181137_0001_r_000007_1 failed to report status for 600 
seconds. Killing!
15/07/18 12:00:32 WARN mapreduce.Job: Error reading task outputhadoop-slave9
15/07/18 12:00:32 WARN mapreduce.Job: Error reading task outputhadoop-slave9
15/07/18 12:00:33 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000004_1, Status : FAILED
Task attempt_201507181137_0001_r_000004_1 failed to report status for 600 
seconds. Killing!
15/07/18 12:00:35 WARN mapreduce.Job: Error reading task outputhadoop-slave11
15/07/18 12:00:35 WARN mapreduce.Job: Error reading task outputhadoop-slave11
15/07/18 12:00:35 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000006_1, Status : FAILED
Task attempt_201507181137_0001_r_000006_1 failed to report status for 600 
seconds. Killing!
15/07/18 12:00:38 WARN mapreduce.Job: Error reading task outputhadoop-slave1
15/07/18 12:00:38 WARN mapreduce.Job: Error reading task outputhadoop-slave1
15/07/18 12:00:38 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000009_1, Status : FAILED
Task attempt_201507181137_0001_r_000009_1 failed to report status for 600 
seconds. Killing!
15/07/18 12:00:41 WARN mapreduce.Job: Error reading task outputhadoop-slave6
15/07/18 12:00:41 WARN mapreduce.Job: Error reading task outputhadoop-slave6
15/07/18 12:00:41 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000003_1, Status : FAILED
Task attempt_201507181137_0001_r_000003_1 failed to report status for 602 
seconds. Killing!
15/07/18 12:00:43 WARN mapreduce.Job: Error reading task outputhadoop-slave8
15/07/18 12:00:43 WARN mapreduce.Job: Error reading task outputhadoop-slave8
15/07/18 12:00:43 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000002_1, Status : FAILED
Task attempt_201507181137_0001_r_000002_1 failed to report status for 602 
seconds. Killing!
15/07/18 12:00:46 WARN mapreduce.Job: Error reading task outputhadoop-slave12
15/07/18 12:00:46 WARN mapreduce.Job: Error reading task outputhadoop-slave12
15/07/18 12:00:46 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000008_1, Status : FAILED
Task attempt_201507181137_0001_r_000008_1 failed to report status for 602 
seconds. Killing!
15/07/18 12:00:48 WARN mapreduce.Job: Error reading task outputhadoop-slave7
15/07/18 12:00:48 WARN mapreduce.Job: Error reading task outputhadoop-slave7
15/07/18 12:00:49 INFO mapreduce.Job:  map 100% reduce 79%
15/07/18 12:00:49 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000005_1, Status : FAILED
Task attempt_201507181137_0001_r_000005_1 failed to report status for 602 
seconds. Killing!
15/07/18 12:00:52 WARN mapreduce.Job: Error reading task outputhadoop-slave5
15/07/18 12:00:52 WARN mapreduce.Job: Error reading task outputhadoop-slave5
15/07/18 12:00:53 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 12:00:58 INFO mapreduce.Job:  map 100% reduce 100%
15/07/18 12:01:21 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 12:01:25 INFO mapreduce.Job:  map 100% reduce 79%
15/07/18 12:01:29 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000000_2, Status : FAILED
Task attempt_201507181137_0001_r_000000_2 failed to report status for 602 
seconds. Killing!
15/07/18 12:01:32 WARN mapreduce.Job: Error reading task outputhadoop-slave4
15/07/18 12:01:32 WARN mapreduce.Job: Error reading task outputhadoop-slave4
15/07/18 12:01:33 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000001_2, Status : FAILED
Task attempt_201507181137_0001_r_000001_2 failed to report status for 600 
seconds. Killing!
15/07/18 12:01:35 WARN mapreduce.Job: Error reading task outputhadoop-slave10
15/07/18 12:01:35 WARN mapreduce.Job: Error reading task outputhadoop-slave10
15/07/18 12:01:47 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 12:01:50 INFO mapreduce.Job:  map 100% reduce 100%
15/07/18 12:10:54 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 12:10:55 INFO mapreduce.Job:  map 100% reduce 79%
15/07/18 12:10:57 INFO mapreduce.Job:  map 100% reduce 59%
15/07/18 12:11:00 INFO mapreduce.Job:  map 100% reduce 49%
15/07/18 12:11:01 INFO mapreduce.Job:  map 100% reduce 39%
15/07/18 12:11:02 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000004_2, Status : FAILED
Task attempt_201507181137_0001_r_000004_2 failed to report status for 600 
seconds. Killing!
15/07/18 12:11:04 WARN mapreduce.Job: Error reading task outputhadoop-slave1
15/07/18 12:11:04 WARN mapreduce.Job: Error reading task outputhadoop-slave1
15/07/18 12:11:05 INFO mapreduce.Job:  map 100% reduce 29%
15/07/18 12:11:05 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000009_2, Status : FAILED
Task attempt_201507181137_0001_r_000009_2 failed to report status for 600 
seconds. Killing!
15/07/18 12:11:08 WARN mapreduce.Job: Error reading task outputhadoop-slave3
15/07/18 12:11:08 WARN mapreduce.Job: Error reading task outputhadoop-slave3
15/07/18 12:11:08 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000003_2, Status : FAILED
Task attempt_201507181137_0001_r_000003_2 failed to report status for 600 
seconds. Killing!
15/07/18 12:11:11 WARN mapreduce.Job: Error reading task outputhadoop-slave9
15/07/18 12:11:11 WARN mapreduce.Job: Error reading task outputhadoop-slave9
15/07/18 12:11:11 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000007_2, Status : FAILED
Task attempt_201507181137_0001_r_000007_2 failed to report status for 602 
seconds. Killing!
15/07/18 12:11:13 WARN mapreduce.Job: Error reading task outputhadoop-slave6
15/07/18 12:11:13 WARN mapreduce.Job: Error reading task outputhadoop-slave6
15/07/18 12:11:14 INFO mapreduce.Job:  map 100% reduce 19%
15/07/18 12:11:14 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000002_2, Status : FAILED
Task attempt_201507181137_0001_r_000002_2 failed to report status for 602 
seconds. Killing!
15/07/18 12:11:17 WARN mapreduce.Job: Error reading task outputhadoop-slave7
15/07/18 12:11:17 WARN mapreduce.Job: Error reading task outputhadoop-slave7
15/07/18 12:11:17 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000008_2, Status : FAILED
Task attempt_201507181137_0001_r_000008_2 failed to report status for 602 
seconds. Killing!
15/07/18 12:11:19 WARN mapreduce.Job: Error reading task outputhadoop-slave5
15/07/18 12:11:19 WARN mapreduce.Job: Error reading task outputhadoop-slave5
15/07/18 12:11:19 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000005_2, Status : FAILED
Task attempt_201507181137_0001_r_000005_2 failed to report status for 602 
seconds. Killing!
15/07/18 12:11:22 WARN mapreduce.Job: Error reading task outputhadoop-slave8
15/07/18 12:11:22 WARN mapreduce.Job: Error reading task outputhadoop-slave8
15/07/18 12:11:23 INFO mapreduce.Job:  map 100% reduce 59%
15/07/18 12:11:23 INFO mapreduce.Job: Task Id : 
attempt_201507181137_0001_r_000006_2, Status : FAILED
Task attempt_201507181137_0001_r_000006_2 failed to report status for 601 
seconds. Killing!
15/07/18 12:11:25 WARN mapreduce.Job: Error reading task outputhadoop-slave2
15/07/18 12:11:25 WARN mapreduce.Job: Error reading task outputhadoop-slave2
15/07/18 12:11:26 INFO mapreduce.Job:  map 100% reduce 79%
15/07/18 12:11:27 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 12:11:39 INFO mapreduce.Job:  map 100% reduce 100%
15/07/18 12:11:55 INFO mapreduce.Job:  map 100% reduce 89%
15/07/18 12:12:00 INFO mapreduce.Job:  map 100% reduce 79%
15/07/18 12:12:12 INFO mapreduce.Job: Job complete: job_201507181137_0001
15/07/18 12:12:12 INFO mapreduce.Job: Counters: 20
FileInputFormatCounters
BYTES_READ=5
FileSystemCounters
FILE_BYTES_WRITTEN=388
HDFS_BYTES_READ=138
Job Counters 
Total time spent by all maps waiting after reserving slots (ms)=0
Total time spent by all reduces waiting after reserving slots (ms)=0
Failed reduce tasks=1
Rack-local map tasks=1
SLOTS_MILLIS_MAPS=22762
SLOTS_MILLIS_REDUCES=723290
Launched map tasks=1
Launched reduce tasks=40
Map-Reduce Framework
Combine input records=0
Failed Shuffles=0
GC time elapsed (ms)=200
Map input records=1
Map output bytes=60
Map output records=10
Merged Map outputs=0
Spilled Records=10
SPLIT_RAW_BYTES=133
the status shows failed
  reduce total  tasks:40, success tasks: 0,failed task: 32,killed tasks: 8

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