Copying Data
About this task
mapr-hbase
package
installed. To ensure that your existing HBase applications and workflow work properly,
install the mapr-hbase
package that provides the same version number of
HBase as your existing Apache HBase. --new.name
parameter:
hbase org.apache.hadoop.hbase.mapreduce.CopyTable
-Dhbase.zookeeper.quorum=<ZooKeeper IP Address>
-Dhbase.zookeeper.property.clientPort=2181 --new.name=/user/john/foo/mytable01
This example migrates the existing Apache HBase table mytable01
to the
MapR-DB tables /user/john/foo/mytable01
. On the node in the MapR
cluster where you will launch the CopyTable tool, modify the value of the
hbase.zookeeper.quorum
property in the
hbase-site.xml
file to point at a ZooKeeper node in the source
cluster. Alternately, you can specify the value for the
hbase.zookeeper.quorum
property from the command line. This example
specifies the value in the command line.
Procedure
-
Create the destination table. This example uses the HBase shell. The maprcli and
MapR Control
System (MCS) are also viable methods.
[user@host]$ hbase shell HBase Shell; enter 'help<RETURN>' for list of supported commands. Type "exit<RETURN>" to leave the HBase Shell hbase(main):001:0> create '/user/john/foo/mytable01', 'usernames', 'userpath' 0 row(s) in 0.2040 seconds
-
Exit the HBase shell.
hbase(main):002:0> exit [user@host]
-
From the HBase command line, use the CopyTable tool to migrate data.
[user@host] hbase org.apache.hadoop.hbase.mapreduce.CopyTable -Dhbase.zookeeper.quorum=zknode1,zknode2,zknode3 --new.name=/user/john/foo/mytable01 mytable01