Modify cluster metadata

[uchiiii]

Changes

Fixes #943

Peformance

I reported #943 and re-measured the performance in the same environment after this improvement. Here is the summary of both before and after.

• before

  $ ./run-benchmarks.sh
  Running Tests for Kafka-Python
  Starting benchmark for Kafka-Python producer.
  Kafka-Python producer Results:
  Number of Runs: 5, Number of messages: 100000, Message Size: 100 bytes.
  Average Time for 100000 messages: 7.028003358840943 seconds.
  Messages / sec: 14228.792289093612
  MB / sec : 1.3569633759587871
  ===================
  Running Tests for AIOKafka
  /root/workspace/news/kafka-client-benchmarks/aiokafka-benchmark.py:40: DeprecationWarning: The loop argument is deprecated since 0.7.1, and scheduled for removal in 0.9.0
  producer = AIOKafkaProducer(loop=loop, **producer_config)
  Starting benchmark for AIOKafka Producer.
  AIOKafka Producer Results:                   
  Number of Runs: 5, Number of messages: 100000, Message Size: 100 bytes.
  Average Time for 100000 messages: 54.26867785453796 seconds.
  Messages / sec: 1842.6835506853604
  MB / sec : 0.17573199755529026
  ===================

• after

  $ ./run-benchmarks.sh
  Running Tests for Kafka-Python
  Starting benchmark for Kafka-Python producer.
  Kafka-Python producer Results:
  Number of Runs: 5, Number of messages: 100000, Message Size: 100 bytes.
  Average Time for 100000 messages: 5.166848373413086 seconds.
  Messages / sec: 19354.15804237015
  MB / sec : 1.8457563440675877
  ===================
  Running Tests for AIOKafka
  /root/workspace/news/kafka-client-benchmarks/aiokafka-benchmark.py:40: DeprecationWarning: The loop argument is deprecated since 0.7.1, and scheduled for removal in 0.9.0
  producer = AIOKafkaProducer(loop=loop, **producer_config)
  kafka parition size: 6056
  Starting benchmark for AIOKafka Producer.
  AIOKafka Producer Results:
  Number of Runs: 5, Number of messages: 100000, Message Size: 100 bytes.
  Average Time for 100000 messages: 3.341134214401245 seconds.
  Messages / sec: 29929.95599188185
  MB / sec : 2.854343032062707
  ===================

As for aiokafka producer, the performance is improved significantly. Messages / sec: 1842 -> 29929 MB / sec : 0.1757 -> 2.854

Checklist

• [x] I think the code is well written
• [x] Unit tests for the changes exist (I do not modify any interface)
• [x] Documentation reflects the changes (same as above)
• [ ] Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
  • .feature: Signifying a new feature.
  • .bugfix: Signifying a bug fix.
  • .doc: Signifying a documentation improvement.
  • .removal: Signifying a deprecation or removal of public API.
  • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[uchiiii]

This workflow requires approval from a maintainer.

@ods Sorry to bother you, but could you approve running workflow on this PR?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (88c6945) 84.21% compared to head (6178bcc) 84.18%. Report is 12 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #942 +/- ## ========================================== - Coverage 84.21% 84.18% -0.03% ========================================== Files 87 87 Lines 10085 10088 +3 ========================================== Hits 8493 8493 - Misses 1592 1595 +3 ``` | [Flag](https://app.codecov.io/gh/aio-libs/aiokafka/pull/942/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | Coverage Δ | | |---|---|---| | [cext](https://app.codecov.io/gh/aio-libs/aiokafka/pull/942/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `79.24% <100.00%> (-0.01%)` | :arrow_down: | | [integration](https://app.codecov.io/gh/aio-libs/aiokafka/pull/942/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `84.16% <100.00%> (-0.03%)` | :arrow_down: | | [purepy](https://app.codecov.io/gh/aio-libs/aiokafka/pull/942/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `83.94% <100.00%> (-0.03%)` | :arrow_down: | | [unit](https://app.codecov.io/gh/aio-libs/aiokafka/pull/942/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs) | `51.56% <66.66%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aio-libs#carryforward-flags-in-the-pull-request-comment) to find out more.

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[uchiiii]

Thank you for the approval for running workflows. I think the failed codecov is not an issue. Let me know if there is something to do.

[ods]

@uchiiii, Thank you for your submission. The solution here just moves calculation from one place to another. This improves performance in one place and may (or may not) worsen it in others. Actually, this calculations are not needed in send at all, so I decided to proceed other way. Please review pr #946, does it solve your problem?