Track when version not found in version vector. #7653

dlambrig · 2022-07-20T22:38:41Z

Add new counter to track when the commit version for an SS is not taken from the version vector. When version vector is enabled there may be a performance hit in that situation. Performance diagnosis is harder without it. The counter should normally be 0.

Joshua:
20220728-195222-henrylambright-45953926d0fe9fe5

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dlambrig · 2022-07-20T22:42:55Z

fdbclient/NativeAPI.actor.cpp

 	}

-	if (ssVersionVectorCache.getMaxVersion() != invalidVersion && readVersion > ssVersionVectorCache.getMaxVersion()) {
+	if (readVersion > ssVersionVectorCache.getMaxVersion()) {


this check was redundant per line 241 above.

This was my bad, actually. I should have removed this redundant check as part of commit c74710f.

fdb-windows-ci · 2022-07-20T22:57:55Z

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Commit ID: 82624e6
Result: ✔️ SUCCEEDED
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foundationdb-ci · 2022-07-20T23:37:57Z

Result of foundationdb-pr on Linux CentOS 7

Commit ID: 82624e6
Duration 0:59:06
Result: ❌ FAILED
Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
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fdbclient/NativeAPI.actor.cpp

foundationdb-ci · 2022-07-21T02:56:40Z

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

Commit ID: 82624e6
Duration 4:17:50
Result: ❌ FAILED
Error: Build has timed out.
Build Logs (available for 30 days)

fdb-windows-ci · 2022-07-21T15:09:38Z

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Result: ✔️ SUCCEEDED
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foundationdb-ci · 2022-07-21T15:32:58Z

Result of foundationdb-pr-macos on macOS BigSur 11.5.2

Commit ID: b01e8b8
Duration 0:42:35
Result: ✅ SUCCEEDED
Error: N/A
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foundationdb-ci · 2022-07-21T15:51:37Z

Result of foundationdb-pr on Linux CentOS 7

Commit ID: b01e8b8
Duration 1:01:17
Result: ❌ FAILED
Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
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sbodagala · 2022-07-21T18:06:21Z

fdbclient/NativeAPI.actor.cpp

 		if (!updatedVersionMap) {
 			TraceEvent(SevDebug, "CommitVersionNotFoundForSS")
-			    .detail("InSSIDMap", ssidTagMapping.find(uid) != ssidTagMapping.end() ? 1 : 0)
+			    .detail("InSSIDMap", iter != ssidTagMapping.end() ? 1 : 0)


I am concerned about the overhead that would be imposed by this event - Is this trace event really needed? What additional actionable information does this provide in production?

I think we only log SevInfo and higher in production. There is a knob controlling the logging level.

It is SevDebug, so off by default. I think it is useful to have if we see a problem in ckperf that is hard to reproduce elsewhere. In that case we may wish to change the trace severity knob to Debug level (this seems to be a common code pattern in fdb), and can find which of the 3 conditionals is failing.

Ok. Would you like to log the contents of the version vector too (this may help with identifying special scenarios like post-recovery at which point the version vector is going to be empty)?

foundationdb-ci · 2022-07-21T19:07:06Z

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

Commit ID: b01e8b8
Duration 4:16:47
Result: ❌ FAILED
Error: Build has timed out.
Build Logs (available for 30 days)

jzhou77 · 2022-07-21T18:31:04Z

fdbclient/NativeAPI.actor.cpp

 		if (!updatedVersionMap) {
 			TraceEvent(SevDebug, "CommitVersionNotFoundForSS")
-			    .detail("InSSIDMap", ssidTagMapping.find(uid) != ssidTagMapping.end() ? 1 : 0)
+			    .detail("InSSIDMap", iter != ssidTagMapping.end() ? 1 : 0)


I think we only log SevInfo and higher in production. There is a knob controlling the logging level.

fdb-windows-ci · 2022-07-22T15:09:51Z

Doxense CI Report for Windows 10

Commit ID: 850a59b
Result: ✔️ SUCCEEDED
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foundationdb-ci · 2022-07-22T15:25:41Z

Result of foundationdb-pr-macos on macOS BigSur 11.5.2

Commit ID: 850a59b
Duration 0:42:34
Result: ✅ SUCCEEDED
Error: N/A
Build Logs (available for 30 days)

foundationdb-ci · 2022-07-22T15:43:13Z

Result of foundationdb-pr on Linux CentOS 7

Commit ID: 850a59b
Duration 1:00:03
Result: ❌ FAILED
Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
Build Logs (available for 30 days)

jzhou77 · 2022-07-22T16:28:15Z

fdbclient/NativeAPI.actor.cpp

+			    .detail("Tag", tag)
+			    .detail("CommitVersion", commitVersion)
+			    .detail("ReadVersion", readVersion)
+			    .detail("VersionVector", ssVersionVectorCache.toString());


This might be large when VV has many entries and the value may be truncated. So probably need to set the max field and event length.

I will use settings I see many places elsewhere. .setMaxEventLength(11000) and .setMaxFieldLength(10000)

foundationdb-ci · 2022-07-22T19:00:41Z

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

Commit ID: 850a59b
Duration 4:17:36
Result: ❌ FAILED
Error: Build has timed out.
Build Logs (available for 30 days)

dlambrig · 2022-07-22T20:09:21Z

There is a bug in vv upgrade/downgrade, putting into draft until that is resolved

dlambrig · 2022-07-28T17:49:11Z

There is a bug in vv upgrade/downgrade, putting into draft until that is resolved

The problem was the new event occurred too many times and TracedTooManyLines was triggered, because the readVersion = commit Version is a common case and should not be logged.

fdb-windows-ci · 2022-07-28T20:34:11Z

Doxense CI Report for Windows 10

Commit ID: 42c23a8
Result: ✔️ SUCCEEDED
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foundationdb-ci · 2022-07-28T20:50:40Z

Result of foundationdb-pr-macos on macOS BigSur 11.5.2

Commit ID: 42c23a8
Duration 0:44:08
Result: ✅ SUCCEEDED
Error: N/A
Build Logs (available for 30 days)

foundationdb-ci · 2022-07-28T21:10:31Z

Result of foundationdb-pr on Linux CentOS 7

Commit ID: 42c23a8
Duration 1:03:57
Result: ✅ SUCCEEDED
Error: N/A
Build Logs (available for 30 days)

foundationdb-ci · 2022-07-28T21:35:51Z

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

Commit ID: 42c23a8
Duration 1:29:19
Result: ✅ SUCCEEDED
Error: N/A
Build Logs (available for 30 days)

Track when version not found in version vector.

82624e6

dlambrig requested review from jzhou77 and sbodagala July 20, 2022 22:38

dlambrig commented Jul 20, 2022

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jzhou77 requested changes Jul 21, 2022

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b01e8b8

dlambrig marked this pull request as ready for review July 21, 2022 14:50

dlambrig requested a review from jzhou77 July 21, 2022 14:50

dlambrig self-assigned this Jul 21, 2022

dlambrig added the diagnostics label Jul 21, 2022

sbodagala reviewed Jul 21, 2022

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jzhou77 previously approved these changes Jul 22, 2022

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sbodagala previously approved these changes Jul 22, 2022

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include vv in event

850a59b

dlambrig dismissed stale reviews from sbodagala and jzhou77 via 850a59b July 22, 2022 14:42

sbodagala previously approved these changes Jul 22, 2022

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jzhou77 reviewed Jul 22, 2022

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jzhou77 mentioned this pull request Jul 22, 2022

cherry pick 7653 - Track when version not found in version vector. #7666

Merged

5 tasks

dlambrig marked this pull request as draft July 22, 2022 20:08

Respond to review comments.

05558b5

dlambrig added 2 commits July 28, 2022 15:47

Merge remote-tracking branch 'origin/main' into clientCounter

05fde30

Fix bug where we logged too many lines

42c23a8

dlambrig dismissed stale reviews from jzhou77 and sbodagala via 42c23a8 July 28, 2022 20:06

dlambrig marked this pull request as ready for review July 28, 2022 21:19

dlambrig requested a review from jzhou77 July 28, 2022 21:20

jzhou77 approved these changes Jul 28, 2022

View reviewed changes

dlambrig merged commit 83d2351 into main Jul 28, 2022

dlambrig deleted the clientCounter branch July 28, 2022 22:26

Track when version not found in version vector. #7653

Track when version not found in version vector. #7653

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