client is the in-browser engine for management of sampling and transformation in the Transformer page.  is automatically downloaded and updated in each user's web browser when accessing the Transformer page. Within the browser, Photon is used to manage sampling and to process transformations on those samples on the local web client, which limits required interactions with the 

Features:

This section contains the user-facing configuration for the  client. Except as noted below, these configuration changes are applied to the , which then applies the configuration to each instance of the  client and its interactions with the node.

NOTE: Some configuration is shared with the running environment. For more information, see Configure Photon Running Environment.

Limitations

Recommended Photon Configuration by Core Count

On the , you can make adjustments to the resources claimed by the Photon running environment based on the number of cores on the machine. The following table identifies the recommended settings for a node with 8, 16, or 32 cores. The default settings assume 16 cores.

Parameter8 cores16 cores (default)32 cores
webapp.numProcesses225
vfs-service.numProcesses223
photon.numThreads244
batchserver.workers.photon.max224

The number of simultaneous users is a competing factor.

The following table illustrates some adjustments for a 16-core system:

Parameter16 cores (default)Low number of simultaneous usersHigh number of simultaneous users
webapp.numProcesses214
vfs-service.numProcesses214
photon.numThreads444
batchserver.workers.photon.max222

Modify Limits

NOTE: Increasing these values can have a significant impact on load times and performance. Change these values only if you are experiencing difficulties. Make incremental changes.

Sample Size Limits

Increasing the sample size may degrade the user experience in the Transformer page in the following ways:

When samples are created using the  running environment, their maximum size is determined by the following parameter. Default value is 10 MB.

"webapp.client.loadLimit": 10485760,

Maximum Data in the Client

The following parameter sets the upper limit to which a sample can grow in the browser. After a sample has been gathered, adding some kinds of transformations, such as joins or adding new columns, can grow the volume of data in the browser. This parameter represents the upper volume of data that can be displayed for a sample + transformations.

"webapp.client.maxResultsBytes": 41943040,


Tip: The value for this parameter should be approximately four times the value for webapp.client.loadLimit.


NOTE: If the data volume of the same grows beyond this size, the number of rows available in the sample is reduced until the sample volume is below this threshold. This truncation happens automatically and without warning.


Tip: You can re-sample the dataset at any time, which creates a new sample that is below the value for webapp.client.loadLimit.

Use Photon Client

The  client is an embedded component of the web client. Access to it is transparent to the user.

Configure VFS Service

Photon interacts with backend datastores through the VFS service.

NOTE: The VFS service is enabled by default and must be enabled when running environment is in use.

For more information, see Configure VFS Service.