[SPARK-25865][CORE] Add GC information to ExecutorMetrics by LantaoJin · Pull Request #22874 · apache/spark

LantaoJin · 2018-10-29T09:16:31Z

What changes were proposed in this pull request?

Only memory usage without GC information could not help us to determinate the proper settings of memory. We need the GC metrics about frequency of major & minor GC. For example, two cases, their configured memory for executor are all 10GB and their usages are all near 10GB. So should we increase or decrease the configured memory for them? This metrics may be helpful. We can increase configured memory for the first one if it has very frequency major GC and decrease the second one if only some minor GC and none major GC.
GC metrics are only useful in entire lifetime of executors instead of separated stages.

How was this patch tested?

Adding UT.

squito · 2018-12-11T20:43:21Z

@LantaoJin #22612 has been merged (and unfortunately seems like there are many merge conflicts now), would you like to update this?

LantaoJin · 2018-12-13T13:45:20Z

@squito Yes, I will update when I get a chance.

LantaoJin · 2018-12-17T10:07:54Z

Updated. cc @squito @rezasafi

rezasafi · 2018-12-17T16:01:08Z

@LantaoJin Thank you very much for the work. Is that possible for you to add an actual spark event log with these new GC metrics under the core/test/resources/spark-events and then update HistoryServerSuite and other places accordingly? (similar to what was done for SPARK-23429(application_1506645932520_24630151) and SPARK-24958(application_1538416563558_0014)). It would be nice to have that here as well.

squito

I'm not entirely sure these metrics make sense with ExecutorMetrics, or maybe it just needs extra handling. The memory metrics make sense as instaneous snapshots, but gc count & gc time are constantly increasing. They make sense over the entire lifetime of the executor, but not when viewed within one stage -- you'd want to subtract out the value at the beginning of the stage.

BTW spark already tracks total gc time as a task metrics -- of course that's a little misleading since gc is not assignable to just one task, but its at least available, and can already be aggregated for the whole executor. So we should think about what is the value add over that existing metric.

Sorry for only commenting about this now, I hadn't thought carefully about what these metrics mean before this.

LantaoJin · 2019-01-02T04:10:11Z

They make sense over the entire lifetime of the executor, but not when viewed within one stage -- you'd want to subtract out the value at the beginning of the stage.

You are right. They only make sense over the entire lifetime. I don't want to separate this metrics to multi-stage. I will check the current implementation. One of purposes to add this is determining the frequency of major & minor GC. Only memory usage couldn't tell us the rationality of memory allocation. For example, two cases, their configured memory for executor are all 10GB and their usages are all near 10GB. So should we increase or decrease the configured memory for them? This metrics may be helpful. We can increase configured memory for the first one if it has very frequency major GC and decrease the second one if only some minor GC and none major GC.

LantaoJin · 2019-01-02T14:05:42Z

retest this please

squito

can you add a smaller event log file? you really just need one, maybe two executors with this update, right? This one is really too big to be checked in.

-rwxr-xr-x 1 irashid staff 34M Jan 7 15:43 application_1536831636016_56998
-rw-r--r-- 1 irashid staff 336K Jan 3 14:52 application_1538416563558_0014
-rw-r--r-- 1 irashid staff 148K Jan 3 14:52 application_1506645932520_24630151
-rwxr-xr-x 1 irashid staff 135K Oct 14 2016 local-1430917381534
-rwxr-xr-x 1 irashid staff 126K Aug 6 12:13 app-20161115172038-0000
-rwxr-xr-x 1 irashid staff 121K Aug 6 12:13 app-20161116163331-0000
-rwxr-xr-x 1 irashid staff 120K Nov 28 16:47 application_1516285256255_0012
-rwxr-xr-x 1 irashid staff 111K Nov 28 16:47 app-20180109111548-0000
-rwxr-xr-x 1 irashid staff 67K Oct 26 2016 local-1422981780767
-rwxr-xr-x 1 irashid staff 65K Oct 26 2016 local-1422981759269
-rwxr-xr-x 1 irashid staff 65K Oct 26 2016 local-1425081759269
-rwxr-xr-x 1 irashid staff 17K Oct 26 2016 local-1426533911241
-rwxr-xr-x 1 irashid staff 17K Oct 26 2016 local-1426633911242
-rw-r--r-- 1 irashid staff 5.1K Oct 26 2016 local-1430917381535_1
-rw-r--r-- 1 irashid staff 5.1K Oct 26 2016 local-1430917381535_2

LantaoJin · 2019-01-08T07:12:43Z

@squito Replaced with a small one:

285K Jan 8 12:42 core/src/test/resources/spark-events/application_1536831636016_59384_1

squito · 2019-01-08T16:17:32Z

Jenkins, ok to test

SparkQA · 2019-01-08T16:21:25Z

Test build #100934 has finished for PR 22874 at commit c3faf61.

This patch fails RAT tests.
This patch merges cleanly.
This patch adds no public classes.

LantaoJin · 2019-01-09T02:37:32Z

retest this please

gaborgsomogyi · 2019-01-09T16:53:29Z

@LantaoJin it won't work even with retest because of the following:

Could not find Apache license headers in the following files:
!????? /home/jenkins/workspace/SparkPullRequestBuilder/core/src/test/resources/spark-events/application_1536831636016_59384_1

rezasafi · 2019-01-09T17:29:38Z

@LantaoJin you should add "application_1536831636016_59384_1 "to /dev/.rat-excludes

LantaoJin · 2019-01-10T03:26:11Z

@gaborgsomogyi @rezasafi Thank you for the kindly reminding.

LantaoJin · 2019-01-10T03:26:52Z

Jenkins, ok to test

SparkQA · 2019-01-10T07:18:44Z

Test build #101001 has finished for PR 22874 at commit 3d9a02c.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

LantaoJin · 2019-01-10T07:42:19Z

Fails by Flaky Test: HiveClientSuites

LantaoJin · 2019-01-10T07:42:33Z

retest this please

LantaoJin · 2019-01-11T09:55:29Z

Jenkins, ok to test

SparkQA · 2019-01-11T14:33:41Z

Test build #101079 has finished for PR 22874 at commit 6dede3e.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

LantaoJin · 2019-01-15T09:24:01Z

Gentle ping @squito @kiszk

squito

generally looks good, a couple of minor things

LantaoJin · 2019-02-19T04:32:18Z

Fix the conflicts of master.
retest this please

SparkQA · 2019-02-19T20:54:45Z

Test build #102507 has finished for PR 22874 at commit 6d5643c.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

LantaoJin · 2019-02-20T06:34:48Z

retest this please

SparkQA · 2019-02-20T08:05:02Z

Test build #102534 has finished for PR 22874 at commit 4d1021c.

This patch fails due to an unknown error code, -9.
This patch merges cleanly.
This patch adds no public classes.

LantaoJin · 2019-02-20T08:17:08Z

retest this please

squito

other than a nit, lgtm, assuming tests pass.

Can you please update the description, as that becomes the commit msg? I would add some of your prior explanation for the utility of this as a metric over the lifetime of the executor #22874 (comment), though its not so useful per-stage.

SparkQA · 2019-02-21T01:39:34Z

Test build #4561 has finished for PR 22874 at commit 4d1021c.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-02-21T07:47:39Z

Test build #102572 has finished for PR 22874 at commit ba500fe.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

kiszk · 2019-02-24T16:37:39Z

+ } else if (!nonBuiltInCollectors.contains(mxBean.getName)) {
+ nonBuiltInCollectors = mxBean.getName +: nonBuiltInCollectors
+ // log it when first seen
+ logWarning(s"Add the non-built-in garbage collector(s) $nonBuiltInCollectors " +


nit: to me, the subject of this sentence is unclear. At first, I interpreted as (Spark) add the ..... Can we make it clear?
For example, Please add ... or Users should add ....

@kiszk Yes, I've modified it now.

kiszk · 2019-02-24T16:38:24Z

LGTM except one minor comment.

SparkQA · 2019-02-25T14:20:46Z

Test build #102745 has finished for PR 22874 at commit 958a728.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

LantaoJin · 2019-02-27T04:34:42Z

Gently ping @squito @kiszk

squito · 2019-03-04T20:26:52Z

merged to master, thanks @LantaoJin -- sorry for the delay from me, was out last week

gatorsmile

@LantaoJin Could you submit another PR to document these new metrics in https://spark.apache.org/docs/latest/monitoring.html

If we do not document them, the Spark users will not be aware of them.

LantaoJin · 2019-03-14T08:56:08Z

@LantaoJin Could you submit another PR to document these new metrics in https://spark.apache.org/docs/latest/monitoring.html
If we do not document them, the Spark users will not be aware of them.

@gatorsmile PR: #24090 , Could you help to review when you have time?

drauschenbach · 2020-07-27T17:54:20Z

I use the IBM java sdk 8.0, and after upgrading to Spark 3 I see these warnings on every single job run:

20/07/26 11:40:38 WARN GarbageCollectionMetrics: To enable non-built-in garbage collector(s) List(scavenge), users should configure it(them) to spark.eventLog.gcMetrics.youngGenerationGarbageCollectors or spark.eventLog.gcMetrics.oldGenerationGarbageCollectors
20/07/26 11:40:38 WARN GarbageCollectionMetrics: To enable non-built-in garbage collector(s) List(global, scavenge), users should configure it(them) to spark.eventLog.gcMetrics.youngGenerationGarbageCollectors or spark.eventLog.gcMetrics.oldGenerationGarbageCollectors

Does anyone know what to do?

I'm using the Baizaicloud Prometheus push gateway metrics sink, if that's relevant.

LantaoJin · 2020-07-28T02:46:48Z

@drauschenbach I am not sure, but looks like scavenge is the young generation collector of IBM JDK and the global may be the old gen. (To confirm it, you'd better to refer the document of IBM JDK). So you can add spark.eventLog.gcMetrics.youngGenerationGarbageCollectors scavenge and spark.eventLog.gcMetrics.oldGenerationGarbageCollectors global in spark-defaults.conf or set --conf spark.eventLog.gcMetrics.youngGenerationGarbageCollectors=scavenge when submitting. This is used to collect GC metrics from Spark executors. If you don't need these GC metrics, just ignore the warn log.

drauschenbach · 2020-07-29T01:12:33Z

@LantaoJin Works great, thanks!

LantaoJin changed the title ~~[WIP][SPARK-25865][CORE] Add GC information to ExecutorMetrics~~[SPARK-25865][WIP][CORE] Add GC information to ExecutorMetricsOct 29, 2018

LantaoJin force-pushed the SPARK-25865 branch from a049454 to 6a7d06bCompare December 17, 2018 10:06

LantaoJin changed the title ~~[SPARK-25865][WIP][CORE] Add GC information to ExecutorMetrics~~[SPARK-25865][CORE] Add GC information to ExecutorMetricsDec 17, 2018

kiszk reviewed Dec 19, 2018
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Comment threadcore/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala Outdated

squito reviewed Dec 19, 2018
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kiszk reviewed Jan 7, 2019
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Comment threadcore/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala Outdated

squito suggested changes Jan 7, 2019
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Comment threadcore/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala Outdated

kiszk reviewed Jan 10, 2019
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Comment threadcore/src/main/scala/org/apache/spark/internal/config/package.scala Outdated

kiszk reviewed Jan 10, 2019
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Comment threadcore/src/main/scala/org/apache/spark/internal/config/package.scala Outdated

squito reviewed Jan 17, 2019
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Comment threadcore/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala Outdated
Comment threadcore/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala Outdated

LantaoJin added 6 commits February 19, 2019 12:26

address comments
e4d9acd

address comments
aa3cf3c

address comments
544749d

address rat check
fe5a04c

address comments
12fc5cc

remove the unclear gc metric configuration
6d5643c

LantaoJin force-pushed the SPARK-25865 branch from 3e8c6b7 to 6d5643cCompare February 19, 2019 04:29

fix ut
4d1021c

squito reviewed Feb 20, 2019
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Comment threadcore/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala Outdated

address the comments
ba500fe

kiszk reviewed Feb 24, 2019
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make log clear
958a728

asfgit closed this in e5c502cMar 4, 2019

gatorsmile reviewed Mar 13, 2019
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