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TryRpc

public final class TryRpc

Perform batches of RPC requests.

This op asynchronously performs either a single RPC request, or a batch of requests. RPC requests are defined by three main parameters:

- `address` (the host+port or BNS address of the request) - `method` (the method name for the request) - `request` (the serialized proto string, or vector of strings, of the RPC request argument).

For example, if you have an RPC service running on port localhost:2345, and its interface is configured with the following proto declaration:

service MyService {
   rpc MyMethod(MyRequestProto) returns (MyResponseProto) {
   
 };
 }
then call this op with arguments:
address = "localhost:2345"
 method = "MyService/MyMethod"
 
The `request` tensor is a string tensor representing serialized `MyRequestProto` strings; and the output string tensor `response` will have the same shape and contain (upon successful completion) corresponding serialized `MyResponseProto` strings.

For example, to send a single, empty, `MyRequestProto`, call this op with `request = ""`. To send 5 parallel empty requests, call this op with `request = ["", "", "", "", ""]`.

More generally, one can create a batch of `MyRequestProto` serialized protos from regular batched tensors using the `encode_proto` op, and convert the response `MyResponseProto` serialized protos to batched tensors using the `decode_proto` op.

NOTE Working with serialized proto strings is faster than instantiating actual proto objects in memory, so no performance degradation is expected compared to writing custom kernels for this workflow.

Unlike the standard `Rpc` op, if the connection fails or the remote worker returns an error status, this op does not reraise the exception. Instead, the `status_code` and `status_message` entry for the corresponding RPC call is set with the error returned from the RPC call. The `response` tensor will contain valid response values for those minibatch entries whose RPCs did not fail; the rest of the entries will have empty strings.

Nested Classes

class TryRpc.Options Optional attributes for TryRpc

Constants

String OP_NAME The name of this op, as known by TensorFlow core engine

Public Methods

static TryRpc
create ( Scope scope, Operand < TString > address, Operand < TString > method, Operand < TString > request, Options... options)
Factory method to create a class wrapping a new TryRpc operation.
static TryRpc.Options
failFast (Boolean failFast)
static TryRpc.Options
protocol (String protocol)
Output < TString >
response ()
Same shape as `request`.
Output < TInt32 >
statusCode ()
Same shape as `request`.
Output < TString >
statusMessage ()
Same shape as `request`.
static TryRpc.Options
timeoutInMs (Long timeoutInMs)

Inherited Methods

Constants

public static final String OP_NAME

The name of this op, as known by TensorFlow core engine

Constant Value: "TryRpc"

Public Methods

public static TryRpc create ( Scope scope, Operand < TString > address, Operand < TString > method, Operand < TString > request, Options... options)

Factory method to create a class wrapping a new TryRpc operation.

Parameters
scope current scope
address `0-D` or `1-D`. The address (i.e. host_name:port) of the RPC server. If this tensor has more than 1 element, then multiple parallel rpc requests are sent. This argument broadcasts with `method` and `request`.
method `0-D` or `1-D`. The method address on the RPC server. If this tensor has more than 1 element, then multiple parallel rpc requests are sent. This argument broadcasts with `address` and `request`.
request `0-D` or `1-D`. Serialized proto strings: the rpc request argument. If this tensor has more than 1 element, then multiple parallel rpc requests are sent. This argument broadcasts with `address` and `method`.
options carries optional attributes values
Returns
  • a new instance of TryRpc

public static TryRpc.Options failFast (Boolean failFast)

Parameters
failFast `boolean`. If `true` (default), then failures to connect (i.e., the server does not immediately respond) cause an RPC failure.

public static TryRpc.Options protocol (String protocol)

Parameters
protocol RPC protocol to use. Empty string means use the default protocol. Options include 'grpc'.

public Output < TString > response ()

Same shape as `request`. Serialized proto strings: the rpc responses.

public Output < TInt32 > statusCode ()

Same shape as `request`. Values correspond to tensorflow Status enum codes.

public Output < TString > statusMessage ()

Same shape as `request`. Values correspond to Status messages returned from the RPC calls.

public static TryRpc.Options timeoutInMs (Long timeoutInMs)

Parameters
timeoutInMs `int`. If `0` (default), then the kernel will run the RPC request and only time out if the RPC deadline passes or the session times out. If this value is greater than `0`, then the op will raise an exception if the RPC takes longer than `timeout_in_ms`.