to make it simple, the number of mappers is the number of "machines" that you want to use. each machine will get N files to copy based on: total files to export / nmappers
Matteo On Thu, Dec 5, 2013 at 12:58 PM, oc tsdb <[email protected]> wrote: > Hi, > > > While exporting HBase snapshots we need to specify number of mappers to use > as mentioned below.To get better performance how many mappers can be used > and please let us know based on which parameters we need to decide on > number of mappers to use.I am new to HBase. > > Please refer if there are good link on this. > > $ bin/hbase class org.apache.hadoop.hbase.snapshot.tool.ExportSnapshot > -snapshot MySnapshot -copy-to hdfs:///srv2:8082/hbase -mappers 16 > > > Thanks > -OC >
