Admin: Cluster StatusΒΆ

The status and location of a cluster can be verified by selecting Cluster Status from the Admin drop down menu.

Table Definitions:
In the provided table each node in an H2O cloud has a row of information.


The name of the node. For example, if a user establishes three nodes on different servers, then Name will display the IP address and port in use for talking to 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 a users parsed data, but also the size in bytes of the information stored in the keys generated from modeling or data manipulation.)

Free men 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 men 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, 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 being used by the node

System Load

The amount of computational work currently being carried out by the cluster.

Node Healthy

Indiacates whether the node indicated by the row of the cluster status table is healthy.


Process ID number.

Last contact

The last time a specific node relayed communication about its status. Last contact should read “now” or some 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 by H2O programmers, and are in development. It is likely that they will be removed in a future revision.