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docs: add metrics doc on barrier #8902

Merged
merged 5 commits into from
Mar 31, 2023
Merged

docs: add metrics doc on barrier #8902

merged 5 commits into from
Mar 31, 2023

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kwannoel
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I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

What's changed and what's your intention?

Credit goes to @BugenZhao for most of the content here.
I have just added some tweaks.

Checklist For Contributors

  • I have written necessary rustdoc comments
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  • I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
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  • I have requested macro/micro-benchmarks as this PR can affect performance substantially, and the results are shown.

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@kwannoel kwannoel changed the title add metrics doc on barrier docs: add metrics doc on barrier Mar 31, 2023
@kwannoel kwannoel requested review from BugenZhao and fuyufjh March 31, 2023 03:04
@github-actions github-actions bot added the component/doc Issues about documentation. label Mar 31, 2023
@BugenZhao BugenZhao requested review from lmatz and removed request for fuyufjh March 31, 2023 03:05
@kwannoel kwannoel added this pull request to the merge queue Mar 31, 2023
@BugenZhao BugenZhao removed this pull request from the merge queue due to a manual request Mar 31, 2023
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Thanks for this doc!

docs/metrics.md Outdated
Concretely, here are some costs of processing streaming messages:
1. CPU cost of evaluating expressions.
2. I/O remote exchange between fragments.
3. hash-join / hash-agg cache-miss (results in extra costs to access state on s3).
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What about making this statement more general? "Executor" should be enough.

docs/metrics.md
2. I/O remote exchange between fragments.
3. hash-join / hash-agg cache-miss (results in extra costs to access state on s3).

Next, high barrier latency could also be caused by buffers in the graph.
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@BugenZhao BugenZhao Mar 31, 2023 •
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May give a hint that in this case we can tweak the buffer size through configuration file (developer-oriented and should be careful), and a heuristic algorithm is on the way. 🤤

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@kwannoel kwannoel Mar 31, 2023 •
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May give a hint that in this case we can tweak the buffer size through configuration file (developer),

Which options can configure this? So far I just see stream_connector_message_buffer_size, but that's just for connector source -> source executor.

and a heuristic algorithm is on the way. 🤤

Any discussions / issues / RFCs I can link to?

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Which options can configure this? So far I just see stream_connector_message_buffer_size, but that's just for connector source -> source executor.

risingwave/src/config/example.toml

Lines 49 to 50 in a36e013

stream_exchange_initial_permits = 8192
stream_exchange_batched_permits = 1024

Any discussions / issues / RFCs I can link to?

I guess we can link to #8654.

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Updated, PTAL

@kwannoel kwannoel requested a review from BugenZhao March 31, 2023 08:02
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Codecov Report

Merging #8902 (a3a9359) into main (620ab91) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8902      +/-   ##
==========================================
- Coverage   70.81%   70.80%   -0.01%     
==========================================
  Files        1181     1181              
  Lines      195771   195771              
==========================================
- Hits       138628   138623       -5     
- Misses      57143    57148       +5
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@kwannoel kwannoel added this pull request to the merge queue Mar 31, 2023
Merged via the queue into main with commit 74b935e Mar 31, 2023
@kwannoel kwannoel deleted the barrier-docs branch March 31, 2023 09:48
Little-Wallace added a commit to Little-Wallace/risingwave that referenced this pull request Apr 11, 2023
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    fix(connector): dbz source handler avoid oom more elegantly (risingwavelabs#8799)

commit ea52212
Author: idx0-dev <[email protected]>
Date:   Mon Apr 3 12:57:08 2023 +0800

    feat(e2esinktest): switch to stream_chunk (risingwavelabs#8914)

commit ac104a7
Author: xiangjinwu <[email protected]>
Date:   Mon Apr 3 10:13:17 2023 +0800

    test(regress): enable `case` (also covers `coalesce` `nullif`) (risingwavelabs#8921)

commit 9f56e80
Author: StrikeW <[email protected]>
Date:   Sun Apr 2 23:54:44 2023 +0800

    fix(ci): quick fix for main cron ci (risingwavelabs#8931)

commit e217689
Author: Tesla Zhang‮ <[email protected]>
Date:   Sun Apr 2 09:20:10 2023 -0400

    refactor(plan_node): simplify agg-related nodes (risingwavelabs#8930)

commit 039d4a0
Author: Liang <[email protected]>
Date:   Sat Apr 1 17:31:50 2023 +0800

    fix(move table): apply version correctly (close risingwavelabs#8764) (risingwavelabs#8765)

commit ad53077
Author: Shuxian Wang <[email protected]>
Date:   Fri Mar 31 15:21:13 2023 -0700

    fix(stream): Better cache handling for temporal join. (risingwavelabs#8871)

commit d687d71
Author: Bugen Zhao <[email protected]>
Date:   Fri Mar 31 23:00:45 2023 +0800

    refactor(config): split streaming and batch developer config (risingwavelabs#8911)

    Signed-off-by: Bugen Zhao <[email protected]>

commit ff1440f
Author: Renjie Liu <[email protected]>
Date:   Fri Mar 31 21:39:27 2023 +0800

    refactor: Remove unnecessary bash scripts (risingwavelabs#8925)

commit dbbd1cb
Author: Yuhao Su <[email protected]>
Date:   Fri Mar 31 18:46:55 2023 +0800

    feat(generated_columns): support select generated columns from source (risingwavelabs#8841)

    Co-authored-by: Bugen Zhao <[email protected]>
    Co-authored-by: stonepage <[email protected]>

commit e51b240
Author: Bohan Zhang <[email protected]>
Date:   Fri Mar 31 17:45:44 2023 +0800

    fix: propagate connector reader error to the upper layer (risingwavelabs#8920)

    Signed-off-by: tabVersion <[email protected]>

commit 74b935e
Author: Noel Kwan <[email protected]>
Date:   Fri Mar 31 17:25:54 2023 +0800

    docs: add metrics doc on barrier (risingwavelabs#8902)

commit 96d92ca
Author: Liang <[email protected]>
Date:   Fri Mar 31 17:22:52 2023 +0800

    feat(sst meta): rollback fetch meta strategy (risingwavelabs#8917)

commit 6c99e93
Author: Li0k <[email protected]>
Date:   Fri Mar 31 16:45:39 2023 +0800

    chore(storage): monitor compacting task count per level (risingwavelabs#8681)

commit 188846e
Author: Renjie Liu <[email protected]>
Date:   Fri Mar 31 16:29:42 2023 +0800

    fix: Disable generated warning in docker compose (risingwavelabs#8916)

commit 85ecc73
Author: August <[email protected]>
Date:   Fri Mar 31 15:45:56 2023 +0800

    fix: replay functions in snapshot on frontend (risingwavelabs#8912)

commit dc5d3de
Author: Kevin Axel <[email protected]>
Date:   Fri Mar 31 15:42:03 2023 +0800

    feat(optimizer): bushy join equivalent condition derivation (risingwavelabs#8668)

    Signed-off-by: Kevin Axel <[email protected]>

commit 010bec6
Author: Xinjing Hu <[email protected]>
Date:   Fri Mar 31 15:32:24 2023 +0800

    perf(encoding): use estimate size to reserve memory in row encoding (risingwavelabs#8909)

    Co-authored-by: stonepage <[email protected]>

commit 1b05700
Author: Renjie Liu <[email protected]>
Date:   Fri Mar 31 15:10:23 2023 +0800

    refactor: Simplify some commands in kafka cdc example. (risingwavelabs#8910)

commit 9bcfb17
Author: Tesla Zhang‮ <[email protected]>
Date:   Fri Mar 31 02:20:44 2023 -0400

    refactor(plan_node): Further simplify join-related plan nodes (risingwavelabs#8905)

Signed-off-by: Little-Wallace <[email protected]>
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