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[#2111] improvement(client): cleanup the useless shuffle server clients when unregister shuffle #2112

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[#2111] improvement(client): cleanup the useless shuffle server clients when unregister shuffle #2112

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xianjingfeng
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@xianjingfeng xianjingfeng commented Sep 11, 2024 •
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What changes were proposed in this pull request?

Cleanup useless the shuffle server clients when unregister shuffle

Why are the changes needed?

Fix: #2111

Does this PR introduce any user-facing change?

No.

How was this patch tested?

UT

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github-actions bot commented Sep 11, 2024 •
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Test Results

 2 897 files  +15   2 897 suites  +15   5h 57m 4s ⏱️ +22s
 1 020 tests + 1   1 019 ✅ + 1   1 💤 ±0  0 ❌ ±0 
12 883 runs  +15  12 868 ✅ +15  15 💤 ±0  0 ❌ ±0 

Results for commit 3e4dbf9. ± Comparison against base commit d170004.

♻️ This comment has been updated with latest results.

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jerqi commented Sep 13, 2024

What will it happen if we don't have this patch?

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xianjingfeng commented Sep 14, 2024 •
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What will it happen if we don't have this patch?

If there are many stages in a application, the client will keep the clients for all shuffle servers, which will waste memory.

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jerqi commented Sep 14, 2024

What will it happen if we don't have this patch?

If there are many stages in a application, the client will keep the clients for all shuffle servers, which will waste memory.

One server may be used by multiple stages. We can't remove it if only one stage is finished.

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What will it happen if we don't have this patch?

If there are many stages in a application, the client will keep the clients for all shuffle servers, which will waste memory.

One server may be used by multiple stages. We can't remove it if only one stage is finished.

Right, not all the shuffle servers will be deleted in this PR

@xianjingfeng xianjingfeng changed the title [#2111] improvement(client): cleanup shuffle server client when unregister shuffle [#2111] improvement(client): cleanup useless shuffle server client when unregister shuffle Sep 14, 2024
@xianjingfeng xianjingfeng changed the title [#2111] improvement(client): cleanup useless shuffle server client when unregister shuffle [#2111] improvement(client): cleanup useless the shuffle server clients when unregister shuffle Sep 14, 2024
@xianjingfeng xianjingfeng changed the title [#2111] improvement(client): cleanup useless the shuffle server clients when unregister shuffle [#2111] improvement(client): cleanup the useless shuffle server clients when unregister shuffle Sep 14, 2024
zuston
zuston reviewed Sep 18, 2024
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Emm. I think we should have the more graceful way to close the shuffle-server clients.

For my sight, I hope the closing way should be optional, which can be implemented by the pluggable closable policies.

internal-client/src/main/java/org/apache/uniffle/client/factory/ShuffleServerClientFactory.java
@@ -75,9 +80,30 @@ public synchronized ShuffleServerClient getShuffleServerClient(
return serverToClients.get(shuffleServerInfo);
}

public synchronized void cleanUselessShuffleServerClients(
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Is is possible that the another thread to hold the removing client?

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@xianjingfeng xianjingfeng Sep 19, 2024 •
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I think it is impossible, if another thread hold the removing client, the shuffleServerInfo of the removing client will always be in shuffleServerInfoMap.

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I hope the closing way should be optional,

+1

which can be implemented by the pluggable closable policies.

What are the possible policies?

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@zuston zuston zuston left review comments

@rickyma rickyma Awaiting requested review from rickyma

@jerqi jerqi Awaiting requested review from jerqi

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[Improvement] cleanup shuffle server client when unregister shuffle
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@xianjingfeng @jerqi @zuston