Admin: Cluster Status¶

To verify the status and location of a cluster, select Cluster Status from the drop-down Admin menu. In the table that displays, the information for each node in an H2O cloud displays in a separate row. A description for each column is provided below.

Name

The name of the node. For example, if a user establishes three nodes on different servers, then the Name column displays the IP address and port used to communicate with each of those unique nodes.

Num Keys

The number of keys in the distributed value store.

Value size bytes

The aggregate size (in bytes) of all data on that node (including the set or subset of parsed data, but also the size in bytes of the information stored in the keys generated from modeling or data manipulation.)

Free mem bytes

The amount of free memory in the H2O node.

Tot mem bytes

The total amount of memory in the H2O node. This value may vary over time depending on use.

Max mem bytes

The maximum amount of memory that the H2O node will attempt to use.

Free disk bytes

The amount of free memory in the ice root. When memory needs exceed the capacity of the node, the overflow is handled by ice root, which is the H2O corollary to disk memory.

Max disk bytes

The maximum amount of memory that can be used from ice root.

Num cpus

The number of cores used by the node.

System Load

The amount of computational work currently being performed by the cluster.

Node Healthy

Indicates if the node indicated by the row of the cluster status table is healthy or not.

PID

Process ID number.

Last contact

The last time a specific node relayed communication about its status. This column should read “now” or contain a number less than 30 (seconds). If last contact is indicated to be more than 30 seconds ago, the node may be experiencing a failure.

Definitions for Fj threads hi, Fj threads low, Fj queue hi, Fj queue low, RCPS, and TCPS Active have been omitted. These fields are primarily designed for use by H2O programmers, and are in development. It is likely that they will be removed in a future revision.