mapr exportstream and mapr importstream

Use these utilities together to export data from MapR streams into binary sequence files, and then import the data from the binary sequence files into other MapR streams. You can also use the mapr importstream utility to import changes that are specified in sequence files output by the mapr diffstreams utility.

Required Permissions

To use the mapr exportstream utility, you must have the following permissions:
  • The readAce permission on the volume where the source stream for mapr exportstream is located.
  • The writeAce permission on the volume in which to save the output from mapr exportstream.
  • On the source stream: either consumeperm or copyperm
  • On the destination directory: write permission
To use the mapr importstream utility, you must have the following permissions:
  • The readAce permission on the volume where the files output by mapr exportstream is located.
  • The writeAce permission on the volume in which the destination stream is located.
  • On the source directory: read permission on the directory and all of the files within it
  • On the destination stream: either copyperm or all three of the following permissions: produceperm, consumeperm, topicperm

For information about how to set permissions on volumes, see Setting Whole Volume ACEs.

For information about how to set permissions on streams, see Enabling Table and Stream Authorizations with ACEs.

Note: The mapr user is not treated as a superuser. MapR-ES does not allow the mapr user to run these utilities unless that user is given the relevant permission or permissions with access-control expressions.

Syntax of mapr exportstream

mapr exportstream 
-src <srcStream>
-dst <dstDir>
[-mapreduce true/false default:false]

Parameters of mapr exportstream

Description Parameter
src The stream to export data from.
dst The directory within the MapR filesystem to export the files to. This directory must already exist before you run the utility.
mapreduce

A Boolean value that specifies whether or not to use a MapReduce program to perform the operation. The default, preferred method is to use a MapReduce program (true).

When this parameter is set to false, a client process uses multiple threads.

Syntax of mapr importstream

mapr importstream 
-src Input binary file or directory path
-dst Destination stream
[-mapreduce true/false default:false]

Parameters of mapr importstream

Description Parameter
src The path of the binary file or files to import.
Examples
-src /temp/part0
-src /temp/*
dst The stream to import data into.
mapreduce

A Boolean value that specifies whether or not to use a MapReduce program to perform the operation. The default, preferred method is to use a MapReduce program (true).

When this parameter is set to false, a client process uses multiple threads.