我安装了hadoop作为docker。 （https://hub.docker.com/r/sequenceiq/hadoop-docker）
HDFS ls输入结果
$ bin/hdfs dfs -ls input
Found 31 items
-rw-r--r-- 1 root supergroup 4436 2015-07-22 11:17 input/capacity-scheduler.xml
-rw-r--r-- 1 root supergroup 1335 2015-07-22 11:17 input/configuration.xsl
-rw-r--r-- 1 root supergroup 318 2015-07-22 11:17 input/container-executor.cfg
-rw-r--r-- 1 root supergroup 155 2015-07-22 11:17 input/core-site.xml
-rw-r--r-- 1 root supergroup 154 2015-07-22 11:17 input/core-site.xml.template
-rw-r--r-- 1 root supergroup 3670 2015-07-22 11:17 input/hadoop-env.cmd
-rw-r--r-- 1 root supergroup 4302 2015-07-22 11:17 input/hadoop-env.sh
-rw-r--r-- 1 root supergroup 2490 2015-07-22 11:17 input/hadoop-metrics.properties
-rw-r--r-- 1 root supergroup 2598 2015-07-22 11:17 input/hadoop-metrics2.properties
-rw-r--r-- 1 root supergroup 9683 2015-07-22 11:17 input/hadoop-policy.xml
-rw-r--r-- 1 root supergroup 126 2015-07-22 11:17 input/hdfs-site.xml
-rw-r--r-- 1 root supergroup 1449 2015-07-22 11:17 input/httpfs-env.sh
-rw-r--r-- 1 root supergroup 1657 2015-07-22 11:17 input/httpfs-log4j.properties
-rw-r--r-- 1 root supergroup 21 2015-07-22 11:17 input/httpfs-signature.secret
-rw-r--r-- 1 root supergroup 620 2015-07-22 11:17 input/httpfs-site.xml
-rw-r--r-- 1 root supergroup 3518 2015-07-22 11:17 input/kms-acls.xml
-rw-r--r-- 1 root supergroup 1527 2015-07-22 11:17 input/kms-env.sh
-rw-r--r-- 1 root supergroup 1631 2015-07-22 11:17 input/kms-log4j.properties
-rw-r--r-- 1 root supergroup 5511 2015-07-22 11:17 input/kms-site.xml
-rw-r--r-- 1 root supergroup 11237 2015-07-22 11:17 input/log4j.properties
-rw-r--r-- 1 root supergroup 951 2015-07-22 11:17 input/mapred-env.cmd
-rw-r--r-- 1 root supergroup 1383 2015-07-22 11:17 input/mapred-env.sh
-rw-r--r-- 1 root supergroup 4113 2015-07-22 11:17 input/mapred-queues.xml.template
-rw-r--r-- 1 root supergroup 138 2015-07-22 11:17 input/mapred-site.xml
-rw-r--r-- 1 root supergroup 758 2015-07-22 11:17 input/mapred-site.xml.template
-rw-r--r-- 1 root supergroup 10 2015-07-22 11:17 input/slaves
-rw-r--r-- 1 root supergroup 2316 2015-07-22 11:17 input/ssl-client.xml.example
-rw-r--r-- 1 root supergroup 2268 2015-07-22 11:17 input/ssl-server.xml.example
-rw-r--r-- 1 root supergroup 2250 2015-07-22 11:17 input/yarn-env.cmd
-rw-r--r-- 1 root supergroup 4567 2015-07-22 11:17 input/yarn-env.sh
-rw-r--r-- 1 root supergroup 1525 2015-07-22 11:17 input/yarn-site.xml
下面的hadoop流命令。
$ bin/hadoop jar share/hadoop/tools/lib/hadoop-streaming-2.7.0.jar \
-input input \
-output test \
-mapper /bin/cat \
-reducer /usr/bin/wc
$ bin/hdfs dfs -cat test/*
2060 7737 78618
和bash命令在这里。
$ bin/hdfs dfs -cat input/* | cat | sort | wc
729 2588 25574
我认为这是与此链接无关的问题： Hadoop MapReduce Streaming output different from the output of running MapReduce locally
为什么结果不同？