HBASE-27890 Expose a getter on Connection/AsyncConnection for getting… by frostruan · Pull Request #5257 · apache/hbase

frostruan · 2023-05-27T15:48:35Z

… public access to connection metrics

frostruan · 2023-05-27T15:57:07Z

I have completed a simple version. I believe there must be a lot of improvement. If you have time, would you mind taking a look and giving me some comments and suggestions?

Apache-HBase · 2023-05-27T16:06:09Z

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Apache-HBase · 2023-05-27T16:06:12Z

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Apache-HBase · 2023-05-27T16:06:14Z

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… public access to connection metrics

Apache-HBase · 2023-05-28T09:17:47Z

🎊 +1 overall

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		37m 29s

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Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5257/2/artifact/yetus-general-check/output/Dockerfile
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Apache-HBase · 2023-05-28T12:49:36Z

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-1 ❌	unit	223m 23s	hbase-server in the patch failed.
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Apache-HBase · 2023-05-28T13:11:05Z

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		_ Prechecks _
		_ master Compile Tests _
+0 🆗	mvndep	0m 11s	Maven dependency ordering for branch
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		_ Patch Compile Tests _
+0 🆗	mvndep	0m 13s	Maven dependency ordering for patch
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		_ Other Tests _
+1 💚	unit	1m 51s	hbase-client in the patch passed.
-1 ❌	unit	245m 38s	hbase-server in the patch failed.
		270m 49s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5257/2/artifact/yetus-jdk8-hadoop3-check/output/Dockerfile
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Apache9 · 2023-05-30T03:14:02Z

Better make an interface and let the MetricsConnection implements it, where we only expose read only methods. Like OnlineRegions and MutableOnlineRegions

I'm also wondering if we want to try to avoid exposing the codahale metrics Snapshot directly? It might make compatibility tricky in the future, if the upstream api there changes? Just a thought

Apache9 · 2023-07-05T14:32:46Z

Any updates here?

Thanks.

frostruan · 2023-07-05T16:43:50Z

Sorry, got a little stuck here. I haven't thought of a good way to expose the metric information in a read-only mode without introducing too many new data structures. I will continue to try.

Thanks Duo.

bbeaudreault · 2023-07-05T23:32:37Z

How many do you think we need to introduce?

Apache9 · 2023-07-06T02:17:12Z

I do not think we need to introduce new 'data structures', instead, we need to introduce new 'interfaces', where the current data structures will implement these interfaces, and provide read only access to the metrics. Anyway, maybe we need to add lots of new methods.

Thanks.

frostruan · 2023-07-07T17:56:52Z

Thanks all for the comments. @Apache9 @bbeaudreault

Many of our metrics are Histogram or Timer types. In order to avoid user code updating metrics, we can only provide interfaces similar to snapshots. As we can imagine, our metric interfaces need to define getMin, getMax, getMean, getMedian, get99thPercentile, get999thPercentile .... , as Duo said, a lot of new methods need to be added, and I am still thinking about how to add them. Thanks.

Apache9 · 2025-08-31T14:09:49Z

Any updates here?

@frostruan

Thanks.

frostruan · 2025-08-31T14:19:13Z

After our internal discussion, it is not a good practice to expose metrics directly in connection and AsyncConnection. Maybe we should avoid doing so. So maybe we can close this issue.

Thanks Duo.@Apache9

Apache9 · 2025-08-31T14:36:22Z

OK, so do we still need HBASE-27885?

HBASE-27890 Expose a getter on Connection/AsyncConnection for getting…
26a3e9c
… public access to connection metrics

frostruan force-pushed the HBASE-27890 branch from b25b318 to 26a3e9cCompare May 28, 2023 08:28

Apache9 reviewed May 30, 2023
View reviewed changes

NihalJain mentioned this pull request Jun 1, 2023
HBASE-27885 expose metaCacheHits in MetricsConnection #5253
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Apache9 closed this Aug 31, 2025

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