Converting Volume Replication Type (High Throughput to Low Latency) Using the CLI

Lists the process to convert the replication type of a volume using the CLI.

About this task

A low latency replication type allows for volumes to be replicated on multiple containers (in parallel) from the primary container.

NOTE Contact MapR support before converting volumes to the low_latency replication type.

To convert from a high-throughput to a low-latency replication type:

Procedure

Change the permissions on the volume from read-write to read only.
For example:
```
maprcli volume modify -name mvol1,mvol2 -readonly true
```
Wait for the running operations to complete before proceeding to the next step.

Convert the volume from high_throughput replication type to low_latency replication type using the maprcli command.

For example:

maprcli volume modify -name mvol1,mvol2 -replicationtype low_latency

Wait till replication type conversion is complete and all the containers of the volume acquire a primary container. If necessary, run the following command to see if replication type has been converted:

maprcli volume list -columns ReplTypeConversionInProgress,volumename

If the conversion is complete, the ReplTypeConversionInProgress flag will be set to false (0). For example, the 0 in the ReplTypeConversionInProgress column in the following sample output indicates successful conversion of corresponding volume in the volumename column:

maprcli volume list -columns ReplTypeConversionInProgress,volumename
                        volumename                    ReplTypeConversionInProgress
                        mapr.apps                     0
                        mapr.cldb.internal            0
                        mapr.cluster.root             0
                        mapr.configuration            0
                        mapr.doc22.lab.local.audit    0
                        mapr.doc22.lab.local.logs     0
                        mapr.doc22.lab.local.mapred   0
                        mapr.doc22.lab.local.metrics  0
                        mapr.doc23.lab.local.audit    0
                        mapr.doc23.lab.local.logs     0
                        mapr.doc23.lab.local.mapred   0
                        mapr.doc23.lab.local.metrics  0
                        mapr.hbase                    0
                        mapr.metrics                  0
                        mapr.opt                      0
                        mapr.resourcemanager.volume   0
                        mapr.tmp                      0
                        mapr.var                      0
                        users                         0

Reset the permissions on the volume to read-write.
For example, to reset, run the following command:
```
maprcli volume modify -name vol1,vol2 -readonly false
```