Description: HDFS modify the number of copies of 2
First step: the number of copies to modify an existing file on HDFS 2
hdfs dfs -setrep 2 -R -w /
Step: 2 is modified dfs.replication (page operation), and then restart the HDFS
HDFS-the site.xml file:
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
The third step: After modifying the number of copies be checked
hdfs fsck / -files -blocks
The fourth step is to manually create a file, uploaded to HDFS, observe the number of copies
if the number of copies or three, first make sure whether a copy of the parameters already in force (the third step of the command can be viewed),
If not, re-download client, in try