Class OpencensusTracer (2.50.0) 

public class OpencensusTracer extends BaseApiTracer

Implementation of ApiTracer that uses OpenCensus.

This implementation wraps an OpenCensus Span for every tracer and annotates that Span with various events throughout the lifecycle of the logical operation.

Each span will be named ClientName.MethodName and will have the following attributes:

attempt count
The Number of attempts sent before the logical operation completed
status
The status code of the last attempt
total response count
The number of messages received across all of the attempts. This will only be set for server streaming and bidi RPCs.
total request count
The number of messages sent across all of the attempts. This will only be set for client streaming and bidi RPCs.
batch count
For batch requests, the number of elements in the request.
batch size
For batch requests, the byte size of the request.

The spans will contain the following annotations:

  • Attempt cancelled with the following attributes:
    attempt
    Zero based sequential attempt number
    attempt request count
    The number of requests sent in this attempt. This will only be set for client streaming and bidi RPCs.
    attempt response count
    The number of responses received in this attempt. This will only be set for server streaming and bidi RPCs.
    connection
    The UUID of the connection which the attempt was sent.
  • Attempt failed, scheduling next attempt with the following attributes:
    attempt
    Zero based sequential attempt number
    status
    The status code of the failed attempt
    delay
    The number of milliseconds to wait before trying again
    attempt request count
    The number of requests sent in this attempt. This will only be set for client streaming and bidi RPCs.
    attempt response count
    The number of responses received in this attempt. This will only be set for server streaming and bidi RPCs.
    connection
    The UUID of the connection which the attempt was sent.
  • Attempts exhausted with the following attributes:
    attempt
    Zero based sequential attempt number
    status
    The status code of the failed attempt
    attempt request count
    The number of requests sent in this attempt. This will only be set for client streaming and bidi RPCs.
    attempt response count
    The number of responses received in this attempt. This will only be set for server streaming and bidi RPCs.
    connection
    The UUID of the connection which the attempt was sent.
  • Attempt failed, error not retryable with the following attributes:
    attempt
    Zero based sequential attempt number
    status
    The status code of the failed attempt
    attempt request count
    The number of requests sent in this attempt. This will only be set for client streaming and bidi RPCs.
    attempt response count
    The number of responses received in this attempt. This will only be set for server streaming and bidi RPCs.
    connection
    The UUID of the connection which the attempt was sent.
  • Attempt succeeded with the following attributes:
    attempt
    Zero based sequential attempt number
    attempt request count
    The number of requests sent in this attempt. This will only be set for client streaming and bidi RPCs.
    attempt response count
    The number of responses received in this attempt. This will only be set for server streaming and bidi RPCs.
    connection
    The UUID of the connection which the attempt was sent.

Long running operations, which are composed of an initial RPC to start the operation and a number of polling RPCs will be represented as a tree of spans. The top level span will be named after the initial RPC name suffixed with "Operation" and will have the following annotations:

  • Operation started
  • Operation failed to start with the following attributes:
    status
    The status code of why the operation failed to start
  • Polling was cancelled with the following attributes:
    attempt
    Zero based sequential poll number.
    attempt request count
  • Scheduling next poll with the following attributes:
    attempt
    Zero based sequential poll number
    status
    OK if the poll succeeded, but the operation is still running.
    delay
    The number of milliseconds to wait before polling again
  • Polling attempts exhausted with the following attributes:
    attempt
    Zero based sequential poll number
    status
    OK if the poll succeeded, but the operation is still running.
  • Polling failed with the following attributes:
    attempt
    Zero based sequential poll number
    status
    OK if the poll succeeded, but the operation is still running.
  • Polling completed with the following attributes:
    attempt
    Zero based sequential poll number

The toplevel long running operation span will also contain child spans to describe the retry attempts for the initial RPC and each poll as described in the general span section above.

This class is thread compatible. It expects callers to follow grpc's threading model: there is only one thread that invokes the operation* and attempt* methods. Please see com.google.api.gax.rpc.ApiStreamObserver for more information.

Inheritance

Object > BaseApiTracer > OpencensusTracer

Methods

attemptCancelled()

public void attemptCancelled()

Add an annotation that the attempt was cancelled by the user.

Overrides

attemptFailed(Throwable error, Duration delay)

public void attemptFailed(Throwable error, Duration delay)

Adds an annotation that the attempt failed, but another attempt will be made after the delay.

Parameters
Name Description
error Throwable
delay org.threeten.bp.Duration
Overrides

attemptFailedRetriesExhausted(Throwable error)

public void attemptFailedRetriesExhausted(Throwable error)

Adds an annotation that the attempt failed and that no further attempts will be made because retry limits have been reached.

Parameter
Name Description
error Throwable
Overrides

attemptPermanentFailure(Throwable error)

public void attemptPermanentFailure(Throwable error)

Adds an annotation that the attempt failed and that no further attempts will be made because the last error was not retryable.

Parameter
Name Description
error Throwable
Overrides

attemptStarted(int attemptNumber)

public void attemptStarted(int attemptNumber)

Adds an annotation that an attempt is about to start. In general this should occur at the very start of the operation. The attemptNumber is zero based. So the initial attempt will be 0.

Parameter
Name Description
attemptNumber int
Overrides

attemptStarted(Object request, int attemptNumber)

public void attemptStarted(Object request, int attemptNumber)

Adds an annotation that an attempt is about to start with additional information from the request. In general this should occur at the very start of the operation. The attemptNumber is zero based. So the initial attempt will be 0.

Parameters
Name Description
request Object
attemptNumber int
Overrides

attemptSucceeded()

public void attemptSucceeded()

Adds an annotation that the attempt succeeded.

Overrides

batchRequestSent(long elementCount, long requestSize)

public void batchRequestSent(long elementCount, long requestSize)

Adds an annotation that a batch of writes has been flushed.

Parameters
Name Description
elementCount long
requestSize long
Overrides

connectionSelected(String id)

public void connectionSelected(String id)

Annotates the operation with selected connection id from the ChannelPool.

Parameter
Name Description
id String
Overrides

inScope()

public ApiTracer.Scope inScope()

Asks the underlying implementation to install itself as a thread local. This allows for interop between clients using gax and external resources to share the same implementation of the tracing. For example OpenCensus will install a thread local that can read by the GRPC.

Returns
Type Description
ApiTracer.Scope
Overrides

lroStartFailed(Throwable error)

public void lroStartFailed(Throwable error)

Signals that the initial RPC for the long running operation failed.

Parameter
Name Description
error Throwable
Overrides

lroStartSucceeded()

public void lroStartSucceeded()

Signals that the initial RPC successfully started the long running operation. The long running operation will now be polled for completion.

Overrides

operationCancelled()

public void operationCancelled()

Signals that the operation was cancelled by the user. The tracer is now considered closed and should no longer be used.

Overrides

operationFailed(Throwable error)

public void operationFailed(Throwable error)

Signals that the overall operation has failed and no further attempts will be made. The tracer is now considered closed and should no longer be used.

Parameter
Name Description
error Throwable
Overrides

operationSucceeded()

public void operationSucceeded()

Signals that the overall operation has finished successfully. The tracer is now considered closed and should no longer be used.

Overrides

requestSent()

public void requestSent()

Adds an annotation that a streaming request has been sent.

Overrides

responseReceived()

public void responseReceived()

Adds an annotation that a streaming response has been received.

Overrides