Monitoring Cluster Nodes that Host Partitions
You can find out which nodes in a MapR cluster are being used for topics in a stream by
running the command maprcli stream topic info
. The nodes are listed in the
servers
field.
The guts
utility can show you whether there are any I/O bottlenecks on these
nodes. This utility can also show you whether there is any capacity on other nodes in the
cluster that you can take advantage of by creating additional partitions for topics.
To run this utility, issue this command after logging into the MapR cluster that you want statistics for:
/opt/mapr/bin/guts
You can also use the guts
utility to show only these statistics from HPE Ezmeral Data Fabric Streams:
Name | Description |
---|---|
mpr |
The number of RPCs from HPE Ezmeral Data Fabric Streams producers to the server. |
mpm |
The number of messages that have been published to the server. |
mpMB |
The total size in MB of the messages that have been published to the server. |
mlr |
The number of RPCs from HPE Ezmeral Data Fabric Streams consumers to the server. |
mlm |
The number of messages that have been read from the server. |
mcl |
The number of concurrent RPCs from consumers to the server. |
mlMB |
The total size in MB of the messages that have been read from the server. |
To see these statistics, run this command:
/opt/mapr/bin/guts streams:all
NOTE These statistics are for the most recent sample period at the time the command is run, and
are not cumulative. Sample periods are one second.