[to #421] add a python script to analyze slow log stats (#527)

[ti-srebot]

cherry-pick #527 to release-3.1
You can switch your code base to this Pull Request by using git-extras:

# In client-java repo:
git pr https://github.com/tikv/client-java/pull/534

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/client-java.git pr/534:release-3.1-c75730e122bc

---

Signed-off-by: Jian Zhang zjsariel@gmail.com

What problem does this PR solve?

Issue Number: close [to #421]

Problem Description: add a python script to analyze slow log and print the stats

What is changed and how it works?

➜ ./scripts/rstats.py --help
usage: rstats.py [-h] [--order ORDER] slowlog

rstats: A TiKV Java Client Request Stats Analyzer

positional arguments:
  slowlog        slow log file

optional arguments:
  -h, --help     show this help message and exit
  --order ORDER  order the output, default: total. accepted value: total,
                 grpc, backoff

an output example:

➜ ./scripts/rstats.py ~/slow.log
Request      Start          Total Lat(ms)  Total gRPC Lat(ms)   Total Backoff Lat(ms)
putIfAbsent  22:50:36.364   868            751                  116
putIfAbsent  22:50:36.945   625            571                  46
putIfAbsent  05:23:10.665   23             0                    21
get          05:23:05.893   11             11                   0

Code changes

• No code, only scripts

Check List for Tests

This PR has been tested by the at least one of the following methods:

• No code

Side effects

• NO side effects

Related changes

• Need to cherry-pick to the release branch

[ti-srebot]

/run-all-tests

[marsishandsome]

LGTM

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-3.1@bbf9e19). Click here to learn what that means.
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@@              Coverage Diff               @@
##             release-3.1     #534   +/-   ##
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  Coverage               ?   28.22%           
  Complexity             ?     1085           
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  Files                  ?      263           
  Lines                  ?    16525           
  Branches               ?     1892           
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  Hits                   ?     4664           
  Misses                 ?    11337           
  Partials               ?      524           

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[iosmanthus]

LGTM