sdk/trace/exporters: add batch span processor exporter #153

mauriciovasquezbernal · 2019-09-19T14:17:49Z

The exporters specification states that two built-in span processors should be
implemented, the simple processor span and the batch processor span.

This commit implements the later, it is mainly based on the opentelemetry/java
one.

The algorithm implements the following logic:

a condition variable is used to notify the worker thread in case the queue
is half full, so that exporting can start before the queue gets full and spans
are dropped.
export is called each schedule_delay_millis if there is a least one new span
to export.
when the processor is shutdown all remaining spans are exported.

The exporters specification states that two built-in span processors should be implemented, the simple processor span and the batch processor span. This commit implements the later, it is mainly based on the opentelemetry/java one. The algorithm implements the following logic: - a condition variable is used to notify the worker thread in case the queue is half full, so that exporting can start before the queue gets full and spans are dropped. - export is called each schedule_delay_millis if there is a least one new span to export. - when the processor is shutdown all remaining spans are exported.

reyang · 2019-09-19T14:44:04Z

Wow, @mauriciovasquezbernal you're faster! I was writing the same thing last night :)

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

reyang · 2019-09-19T14:57:50Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ self,
+ span_exporter: SpanExporter,
+ max_queue_size: int = 2048,
+ schedule_delay_millis: int = 5000,


int -> float?

@reyang milliseconds aren't precise enough here?

reyang · 2019-09-19T15:14:28Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ """Exports at most max_export_batch_size spans."""
+ idx = 0
+ spans = []
+ # currently only a single thread acts as consumer, so queue.get() will


Consider this https://github.com/census-instrumentation/opencensus-python/blob/2457a87165bbe3951ae48a2a56c2177d7f277be2/opencensus/common/schedule/__init__.py#L76.

I am not sure how I could integrate it. It'd a big redesign.

reyang · 2019-09-19T15:15:10Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ except Exception as exc:
+ logger.warning("Exception while exporting data: %s", exc)
+
+ def flush(self):


Suggested change

def flush(self):

def _flush(self):

reyang

LGTM.

- use // instead of / - set daemon=true - fix error message for max_batch_size - change schedule_delay_millis' type to float - make flush internal method

mauriciovasquezbernal · 2019-09-23T09:56:38Z

I handled most of the feedback, improved the way the timeout it calculated and added a couple of new tests.

it doesn't work sometimes when using the exact same value of schedule_delay_millis, add some room

Oberon00

I think the skipping of _flush is a bug, all others are nitpicks.

Oberon00 · 2019-09-24T08:13:37Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ try:
+ self.queue.put(span, block=False)
+ except queue.Full:
+ # TODO: dropped spans counter?


Dropped span counter sounds like a plan. Or we could log a warning the first time a span is dropped.

Good idea, I'd just log the first time a span is dropped. A better approach could be a rate-limited logging system that actually prints the number of spans being dropped per second or so.

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

Oberon00 · 2019-09-25T12:05:51Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ except queue.Full:
+ # TODO: dropped spans counter?
+ pass
+ if self.queue.qsize() >= self.half_max_queue_size:


Suggested change

if self.queue.qsize() >= self.half_max_queue_size:

if self.queue.qsize() == self.half_max_queue_size:

I think we send too many notifications otherwise.

I create a variable to avoid this "notification storm", the equal comparison could not work because it is possible that the check misses it (two spans end at the same time...).
Please give me your feedback in the new solution.

Oberon00 · 2019-09-25T12:11:07Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ )
+
+ self.span_exporter = span_exporter
+ self.queue = queue.Queue(max_queue_size)


You never call https://docs.python.org/3/library/queue.html#queue.Queue.task_done on the queue. Maybe a https://docs.python.org/3/library/collections.html#collections.deque would be the better (more light-weight) choice?

Deques support thread-safe, memory efficient appends and pops

I'm not sure it'll work. It doesn't provide a way to access the number of elements in the queue, so an external counter for the number of elements would be needed (not sure if this will work because deque drops elements without warning).

It does, just use len(mydeque) :

In addition to the above, deques support iteration, pickling, len(d), reversed(d), copy.copy(d), copy.deepcopy(d), membership testing with the in operator, and subscript references such as d[-1].

You're totally right, I need more coffee.

I used it, two changes:

now older spans are dropped (that's the way deque works, cannot be changed).

it is not possible to count the number of dropped spans (we can guess that spans would be dropped).

now older spans are dropped

It sounds like we need to clarify that in the spec, I actually expected that we'd drop the oldest spans first.

it is not possible to count the number of dropped spans

I think it is if we lock around adding spans to the deque, which we might need to do later anyway.

If we only consider CPython with its GIL, a plain list with a lock (condition) might actually be the best solution after all. But I expect the deque without locking at every added span to perform significantly better in GIL-less Python (pypy). By introducing a single lock that is called on every span.end(), we would effectively reintroduce a sort of GIL (even though we only hold this lock for a short time at once, it would be highly contended).

I'd like to avoid as much as possible having a lock when adding an element as it will content on all span endings.
That said, we could look more into detail of this implementation later on, there is too much room to improve and discuss.

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

Oberon00 · 2019-09-25T12:43:03Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ logger.warning("Exception while exporting data: %s", exc)
+
+ def _flush(self):
+ while not self.queue.empty():


Instead of checking queue.empty() here again, we could have export return a bool.

Oberon00 · 2019-09-25T12:44:20Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ pass
+
+ def on_end(self, span: Span) -> None:
+ try:


I wonder if we should also check done here and bail out with a warning if it is true.

I think specification is not clear if onEnd() could be called after shutdown(), anyway, be defensive now and check it.

Oberon00 · 2019-09-25T12:49:41Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ pass
+
+ def on_end(self, span: Span) -> None:
+ try:


Another thing we should maybe do is check https://docs.python.org/3/library/threading.html#threading.Thread.is_alive for our worker and restart it (logging a warning) if it crashed.

I am not sure about this one. Maybe if that thread could crash we should implement a health check somewhere else I think. I don't want to make this onEnd slower because it's called to each span.

Although, about the slowness, we could maybe only check it in cases where we notify the condition.

- log when dropping spans - check if processor is already shutdown - avoid using RLock - prereserve span array - introduce variable to avoid sending notification storm

c24t

A few non-blocking comments, and I think the tests could still use some attention, but otherwise it looks great. Thanks for picking this up!

c24t · 2019-09-25T22:56:37Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+
+ if max_export_batch_size > max_queue_size:
+ raise ValueError(
+ "max_export_batch_size must be less and equal to max_export_batch_size."


Suggested change

"max_export_batch_size must be less and equal to max_export_batch_size."

"max_export_batch_size must be less than or equal to max_export_batch_size."

Also FWIW the type annotations don't do anything at runtime, if you want to enforce int/float types here we need a type check too.

That check is not strictly needed, I just want a number, if the user pass something else it'll fail at some point.

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

c24t · 2019-09-25T23:02:55Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ self.span_exporter.export(spans[:idx])
+ # pylint: disable=broad-except
+ except Exception:
+ logger.warning(


You don't think logger.exception is justified here?

c24t · 2019-09-26T06:36:16Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ "Exception while exporting data.", exc_info=sys.exc_info()
+ )
+
+ return self.queue


~~Why return the queue?~~

I see @Oberon00's comment now, maybe do this instead:

Suggested change

return self.queue

return bool(self.queue)

But I think this is a surprising return type for export.

I'll just return to my original approach. export() returns nothing and flush() checks the size of the queue. It's clear after all.

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

c24t · 2019-09-26T07:04:17Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ return self.queue
+
+ def _flush(self):
+ while self.export():


Maybe a problem for another PR, but we probably want a timeout on flush too.

Yes, let's keep an eye on it.

c24t · 2019-09-26T07:11:51Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ if len(self.queue) >= self.max_queue_size // 2:
+ with self.condition:
+ if not self.notified:
+ self.notified = True


If I understand this correctly, it's to prevent calling notify_all when the worker isn't actually waiting, which could happen if we're adding spans to the queue fast enough that we never drain it more than halfway.

My intuition is that notify_all is effectively a no-op if nothing is waiting on the cv, so I'm surprised you think it's worth the check to prevent the extra calls. In any case this is fine, just curious whether I'm missing something here.

Yeah, my original suggestion that triggered this was to use == instead of >= but @mauriciovasquezbernal rightly rejected that because with multiple threads adding spans, the condition might never be hit. But you are right that notify_all is semantically a no-op if no one is waiting, so I'd say the self.notified variable is overkill.

I got confused. The notified variable I introduced is a horrible and wrong hack.
notify() is not-op when nobody is waiting:

This method wakes up at most n of the threads waiting for the condition variable; it is a no-op if no threads are waiting.

c24t · 2019-09-26T07:15:45Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ return
+ if len(self.queue) == self.max_queue_size:
+ if not self._spans_dropped:
+ logging.warning("Queue is full, likely spans will be dropped.")


This is a consequence of adding items outside the condition, because the worker might wake up and consume some spans between here and appendleft below?

I bet we'll want exact stats on dropped spans in the future, will probably need to change this behavior.

I think if we want exact stats we can either:

Go back to using queue.Queue

Use a lock and a plain list

Estimate the number with n_ended_spans - (n_exported_or_exporting_spans + len(self.queue)) (becomes exact after shutdown, or whenever no spans are currently added or processed)

Maybe the queue implementation that @reyang suggested, I haven't looked at it though so I don't know if that would solve the problem.

@c24t yes you right. There is not a way to actually now if the queue will be full when appendleft will be called. I agree with both of you, if we need to support that use case we'll need another approach.

c24t · 2019-09-26T07:21:49Z

opentelemetry-sdk/tests/trace/export/test_export.py

- class MySpanExporter(export.SpanExporter):
- def __init__(self, destination):
- self.destination = destination
+ tracer = trace.Tracer()


I'd vote to leave the tracer out of these tests and call on_end directly with some mock spans instead.

I like this idea, make them look more like test units than integration tests.
I updated it.

c24t · 2019-09-26T07:37:47Z

opentelemetry-sdk/tests/trace/export/test_export.py

+
+ # call shutdown on specific span processor
+ # TODO: this call is missing in the tracer
+ span_processor.shutdown()


Since this test and the one above just seem to check _flush, it's probably worth adding a separate check that we only export max_export_batch_size many spans at a time during normal operation.

I'll add it.

c24t · 2019-09-26T07:51:35Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ with self.condition:
+ if not self.notified:
+ self.notified = True
+ self.condition.notify_all()


Also, out of curiosity, why this instead of notify when there's only one worker?

Changed to notify()

Oberon00 · 2019-09-26T08:34:45Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ """Exports at most max_export_batch_size spans."""
+ idx = 0
+ spans = [None] * self.max_export_batch_size
+ # currently only a single thread acts as consumer, so queue.pop() will


will raise or will not raise?

the not got lost while wrapping the line.

Oberon00 · 2019-09-26T08:47:15Z

opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py

+ def export(self) -> bool:
+ """Exports at most max_export_batch_size spans."""
+ idx = 0
+ spans = [None] * self.max_export_batch_size


Continuing from #153 (comment)

(Just an optimization, maybe for another PR:) I suggest we either use some more clever preallocation size than the max, or we create the list once at thread startup in the worker function and reuse it every time in export.

@Oberon00 one clever preallocation strategy is letting python handle this under the hood and just appending to an empty list. :P

I think if we reuse the same list and emtpy it every time, that would actually be good. 😉

The thing with the batch exporter is that it is all about performance (otherwise we could use the simple exporter). I understand that moving the bulk of the work to another thread is already the most important part though.

I think the @Oberon00 could be a good approach, I implemented it. However if we really want to optimize it we should do some benchmark first.

- export returns nothing - added another test that sends more than max_queue_size elements - removed notified extra variable - move preallocated list to class

Oberon00 · 2019-09-27T10:23:50Z

@mauriciovasquezbernal: once you fixed the checks and think this is ready for merging, please ping!

mauriciovasquezbernal · 2019-09-27T12:12:42Z

I fixed the checks, I am missing #181 as there is discussion still going on there. Perhaps we can merge it and update #181 to also fix this case.

for start_time and end_time Make lint happy Addressing comments Addressing comments Allowing 0 as start and end time Fix lint issues Metrics API RFC 0003 cont'd (open-telemetry#136) * Create functions Comments for Meter More comments Add more comments Fix typos * fix lint * Fix lint * fix typing * Remove options, constructors, seperate labels * Consistent naming for float and int * Abstract time series * Use ABC * Fix typo * Fix docs * seperate measure classes * Add examples * fix lint * Update to RFC 0003 * Add spancontext, measurebatch * Fix docs * Fix comments * fix lint * fix lint * fix lint * skip examples * white space * fix spacing * fix imports * fix imports * LabelValues to str * Black formatting * fix isort * Remove aggregation * Fix names * Remove aggregation from docs * Fix lint * metric changes * Typing * Fix lint * Fix lint * Add space * Fix lint * fix comments * address comments * fix comments Adding a working propagator, adding to integrations and example (open-telemetry#137) Adding a full, end-to-end example of propagation at work in the example application, including a test. Adding the use of propagators into the integrations. Metrics API RFC 0009 (open-telemetry#140) * Create functions Comments for Meter More comments Add more comments Fix typos * fix lint * Fix lint * fix typing * Remove options, constructors, seperate labels * Consistent naming for float and int * Abstract time series * Use ABC * Fix typo * Fix docs * seperate measure classes * Add examples * fix lint * Update to RFC 0003 * Add spancontext, measurebatch * Fix docs * Fix comments * fix lint * fix lint * fix lint * skip examples * white space * fix spacing * fix imports * fix imports * LabelValues to str * Black formatting * fix isort * Remove aggregation * Fix names * Remove aggregation from docs * Fix lint * metric changes * Typing * Fix lint * Fix lint * Add space * Fix lint * fix comments * handle, recordbatch * docs * Update recordbatch * black * Fix typo * remove ValueType * fix lint Console exporter (open-telemetry#156) Make use_span more flexible (closes open-telemetry#147). (open-telemetry#154) Co-Authored-By: Reiley Yang <reyang@microsoft.com> Co-Authored-By: Chris Kleinknecht <libc@google.com> WSGI fixes (open-telemetry#148) Fix http.url. Don't delay calling wrapped app. Skeleton for azure monitor exporters (open-telemetry#151) Add link to docs to README (open-telemetry#170) Move example app to the examples folder (open-telemetry#172) WSGI: Fix port 80 always appended in http.host (open-telemetry#173) Build and host docs via github action (open-telemetry#167) Add missing license boilerplate to a few files (open-telemetry#176) sdk/trace/exporters: add batch span processor exporter (open-telemetry#153) The exporters specification states that two built-in span processors should be implemented, the simple processor span and the batch processor span. This commit implements the latter, it is mainly based on the opentelemetry/java one. The algorithm implements the following logic: - a condition variable is used to notify the worker thread in case the queue is half full, so that exporting can start before the queue gets full and spans are dropped. - export is called each schedule_delay_millis if there is a least one new span to export. - when the processor is shutdown all remaining spans are exported. Implementing W3C TraceContext (fixes open-telemetry#116) (open-telemetry#180) * Implementing TraceContext (fixes open-telemetry#116) This introduces a w3c TraceContext propagator, primarily inspired by opencensus. fix time conversion bug (open-telemetry#182) Introduce Context.suppress_instrumentation (open-telemetry#181) Metrics Implementation (open-telemetry#160) * Create functions Comments for Meter More comments Add more comments Fix typos * fix lint * Fix lint * fix typing * Remove options, constructors, seperate labels * Consistent naming for float and int * Abstract time series * Use ABC * Fix typo * Fix docs * seperate measure classes * Add examples * fix lint * Update to RFC 0003 * Add spancontext, measurebatch * Fix docs * Fix comments * fix lint * fix lint * fix lint * skip examples * white space * fix spacing * fix imports * fix imports * LabelValues to str * Black formatting * fix isort * Remove aggregation * Fix names * Remove aggregation from docs * Fix lint * metric changes * Typing * Fix lint * Fix lint * Add space * Fix lint * fix comments * handle, recordbatch * docs * Update recordbatch * black * Fix typo * remove ValueType * fix lint * sdk * metrics * example * counter * Tests * Address comments * ADd tests * Fix typing and examples * black * fix lint * remove override * Fix tests * mypy * fix lint * fix type * fix typing * fix tests * isort * isort * isort * isort * noop * lint * lint * fix tuple typing * fix type * black * address comments * fix type * fix lint * remove imports * default tests * fix lint * usse sequence * remove ellipses * remove ellipses * black * Fix typo * fix example * fix type * fix type * address comments Implement Azure Monitor Exporter (open-telemetry#175) Span add override parameters for start_time and end_time (open-telemetry#179) CONTRIBUTING.md: Fix clone URL (open-telemetry#177) Add B3 exporter to alpha release table (open-telemetry#164) Update README for alpha release (open-telemetry#189) Update Contributing.md doc (open-telemetry#194) Add **simple** client/server examples (open-telemetry#191) Remove unused dev-requirements.txt (open-telemetry#200) The requirements are contained in tox.ini now. Fx bug in BoundedList for Python 3.4 and add tests (open-telemetry#199) * fix bug in BoundedList for python 3.4 and add tests collections.deque.copy() was introduced in python 3.5, this commit changes that by the deque constructor and adds some tests to BoundedList and BoundedDict to avoid similar problems in the future. Also, improve docstrings of BoundedList and BoundedDict classes Move util.time_ns to API. (open-telemetry#205) Add Jaeger exporter (open-telemetry#174) This adds a Jeager exporter for OpenTelemetry. This exporter is based on https://github.com/census-instrumentation/opencensus-python/tree/master/contrib/opencensus-ext-jaeger. The exporter uses thrift and can be configured to send data to the agent and also to a remote collector. There is a long discussion going on about how to include generated files in the repo, so for now just put them here. Add code coverage Revert latest commit Fix some "errors" found by mypy. (open-telemetry#204) Fix some errors found by mypy (split from open-telemetry#201). Update README for new milestones (open-telemetry#218) Refactor current span handling for newly created spans. (open-telemetry#198) 1. Make Tracer.start_span() simply create and start the Span, without setting it as the current instance. 2. Add an extra Tracer.start_as_current_span() to create the Span and set it as the current instance automatically. Co-Authored-By: Chris Kleinknecht <libc@google.com> Add set_status to Span (open-telemetry#213) Initial commit Initial version

* fix: minor fix * fix: remove _ prefix from params

mauriciovasquezbernal requested review from a-feld, c24t, carlosalberto, lzchen, Oberon00, reyang and toumorokoshi as code owners September 19, 2019 14:17

reyang reviewed Sep 19, 2019

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mauriciovasquezbernal added 4 commits September 23, 2019 10:45

address feedback 1

ffe33fc

- use // instead of / - set daemon=true - fix error message for max_batch_size - change schedule_delay_millis' type to float - make flush internal method

Merge branch 'master' into mauricio/add_batch_span_processor

4784c15

substract time the exporter takes to the timeout

3e69336

add some more tests

f4256b8

add a little bit of room to timeout test

7559ee4

it doesn't work sometimes when using the exact same value of schedule_delay_millis, add some room

Oberon00 reviewed Sep 25, 2019

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mauriciovasquezbernal added 2 commits September 25, 2019 17:09

handle feedback:

75a32dd

- log when dropping spans - check if processor is already shutdown - avoid using RLock - prereserve span array - introduce variable to avoid sending notification storm

use collections.deque

cf023ed

reyang mentioned this pull request Sep 26, 2019

Implement Azure Monitor Exporter #175

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c24t approved these changes Sep 26, 2019

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Oberon00 reviewed Sep 26, 2019

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Oberon00 mentioned this pull request Sep 26, 2019

add Jaeger exporter #174

Merged

reyang mentioned this pull request Sep 27, 2019

Introduce Context.suppress_instrumentation #181

Merged

mauriciovasquezbernal added 2 commits September 27, 2019 10:59

further changes:

5366af1

- export returns nothing - added another test that sends more than max_queue_size elements - removed notified extra variable - move preallocated list to class

improve tests by removing tracer and using mock spans

0346b19

make lint happy

66c5191

Oberon00 merged commit d0946cd into open-telemetry:master Sep 27, 2019

mauriciovasquezbernal mentioned this pull request Oct 3, 2019

Implement BatchSpanProcessorExporter #149

Closed

mauriciovasquezbernal deleted the mauricio/add_batch_span_processor branch April 14, 2020 21:50

srikanthccv pushed a commit to srikanthccv/opentelemetry-python that referenced this pull request Nov 1, 2020

fix: minor fix (open-telemetry#153)

b1dc1a3

* fix: minor fix * fix: remove _ prefix from params

	if self.queue.qsize() >= self.half_max_queue_size:
	if self.queue.qsize() == self.half_max_queue_size:

	"max_export_batch_size must be less and equal to max_export_batch_size."
	"max_export_batch_size must be less than or equal to max_export_batch_size."

sdk/trace/exporters: add batch span processor exporter #153

sdk/trace/exporters: add batch span processor exporter #153

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mauriciovasquezbernal commented Sep 19, 2019

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Oberon00 commented Sep 27, 2019

mauriciovasquezbernal commented Sep 27, 2019

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