ROOT files with duplicated GUIDs observed on production T0 replay workflows #37240

khurtado · 2022-03-14T15:06:25Z

This is related to a WMCore issue:

Bug description
When deploying T0 replays with a significant amount of jobs, one of the WMCore components fail complaining about duplicated LFNs. Our LFN patterns look like this:

/store/unmerged/HG2202_Val/RelValProdMinBias/GEN-SIM/HG2202_Val_OLD_Alanv4-v22/00000/2AE85F14-94A1-EC11-BBF5-FA163EC7AA59.root

where: 2AE85F14-94A1-EC11-BBF5-FA163EC7AA59 is the GUID extracted from the ROOT file through the framework XML job report.

So we are basically observing 2 different jobs generating files with the same GUID.
We get the GUID from the framework XML job report here:

And since the GUID from the FW report seems to be generated here:
https://github.com/cms-sw/cmssw/blob/master/FWCore/Utilities/src/Guid.cc#L18-L28

I'm reporting the issue here.

How to reproduce
Deploy a Tier0 replay with a significant amount of jobs. I think @germanfgv can help with this if needed. At least one incident has been reported per week lately this year.

The text was updated successfully, but these errors were encountered:

cmsbuild · 2022-03-14T15:06:44Z

A new Issue was created by @khurtado Kenyi Hurtado.

@Dr15Jones, @perrotta, @dpiparo, @makortel, @smuzaffar, @qliphy can you please review it and eventually sign/assign? Thanks.

cms-bot commands are listed here

makortel · 2022-03-14T15:10:12Z

assign core

cmsbuild · 2022-03-14T15:10:34Z

New categories assigned: core

@Dr15Jones,@smuzaffar,@makortel you have been requested to review this Pull request/Issue and eventually sign? Thanks

makortel · 2022-03-14T15:33:19Z

@khurtado What CMSSW version was used in these tests? Was there only one GUID collision in the replay or many? Do you have any information about the hosts that produced the files whose GUIDs collided?

makortel · 2022-03-14T15:36:50Z

The process-level GUID is created here

cmssw/FWCore/Utilities/src/processGUID.cc

Lines 4 to 7 in 62d26a2

    
           Guid const& processGUID() { 
        
             static Guid const guid; 
        
             return guid; 
        
           }

Notably this calls the edm::Guid() constructor with usetime == false leading to

cmssw/FWCore/Utilities/src/Guid.cc

Lines 21 to 27 in 62d26a2

    
           } else { 
        
             // uuid_generate() defaults to uuid_generate_random() if /dev/urandom 
        
             // is available; if /dev/urandom is not available, then it is better 
        
             // to let uuid_generate() choose the best fallback rather than forcing 
        
             // use of an inferior source of randomness 
        
             ::uuid_generate(data_); 
        
           }

branch being taken.

khurtado · 2022-03-14T15:54:01Z

@makortel
They were using:
CMSSW_12_0_2_patch1 with scram arch: slc7_amd64_gcc900

You can find logs of different set of jobs generating files with the same guid here:
/afs/cern.ch/user/c/cmst0/public/JobAccountant/jobs

Logs seem to have 2 replays, one with many incidents, involving 2 files/jobs but one of them (in g5 directory) involves 3 files/jobs:

[khurtado@lxplus708 /afs/cern.ch/user/c/cmst0/public/JobAccountant/jobs]$ find . -name "dupPickles.json" -exec head -n 2 {} \;
{
  "/data/tier0/srv/wmagent/3.0.1/install/tier0/JobCreator/JobCache/Express_Run343082_StreamCalibration_Tier0_REPLAY_2021_v2110131547_211013_1547/Express/JobCollection_1_1/job_1058/Report.0.pkl": {
{
  "/data/tier0/srv/wmagent/3.0.1/install/tier0/JobCreator/JobCache/Express_Run343082_StreamCalibration_Tier0_REPLAY_2021_v2110131547_211013_1547/Express/JobCollection_1_1/job_1064/Report.0.pkl": {
{
  "/data/tier0/srv/wmagent/3.0.1/install/tier0/JobCreator/JobCache/Express_Run343082_StreamCalibration_Tier0_REPLAY_2021_v2110131547_211013_1547/Express/JobCollection_1_1/job_1038/Report.0.pkl": {
{
  "/data/tier0/srv/wmagent/3.0.1/install/tier0/JobCreator/JobCache/Express_Run343082_StreamCalibration_Tier0_REPLAY_2021_v2110131547_211013_1547/Express/JobCollection_1_0/job_527/Report.0.pkl": {
{
  "/data/tier0/srv/wmagent/3.0.1/install/tier0/JobCreator/JobCache/Express_Run344063_StreamCalibration_Tier0_REPLAY_2021_v2110131547_211013_1548/Express/JobCollection_5_1/job_4623/Report.0.pkl": {

The condor logfiles have information about the hosts runninig these jobs. The collisions involve different condor jobs, but runnnig in the same host for each collision incident:

[khurtado@lxplus708 /afs/cern.ch/user/c/cmst0/public/JobAccountant/jobs]$ find . -name "condor*out" -exec grep -H Hostname {} \; | sort
./g1/job_1038/condor.41731.37.out:Hostname:   b7g18p9798.cern.ch
./g1/job_1048/condor.41731.47.out:Hostname:   b7g18p9798.cern.ch
./g2/job_98/condor.41726.97.out:Hostname:   b7g18p7310.cern.ch
./g2/job_99/condor.41726.98.out:Hostname:   b7g18p7310.cern.ch
./g3/job_1137/condor.41731.136.out:Hostname:   b7g17p4406.cern.ch
./g3/job_1138/condor.41731.137.out:Hostname:   b7g17p4406.cern.ch
./g4/job_1169/condor.41731.168.out:Hostname:   b7g18p3673.cern.ch
./g4/job_1170/condor.41731.169.out:Hostname:   b7g18p3673.cern.ch
./g5/job_527/condor.41729.133.out:Hostname:   b7g10p4995.cern.ch
./g5/job_530/condor.41729.136.out:Hostname:   b7g10p4995.cern.ch
./g5/job_531/condor.41729.137.out:Hostname:   b7g10p4995.cern.ch
./g6/job_4623/condor.41780.47.out:Hostname:   b7g17p1733.cern.ch
./g6/job_4635/condor.41780.59.out:Hostname:   b7g17p1733.cern.ch

And they involve the same or almost the same runtime date:

[khurtado@lxplus708 /afs/cern.ch/user/c/cmst0/public/JobAccountant/jobs]$ find . -name "condor*out" -exec grep -H "Local time" {} \; | sort
./g1/job_1038/condor.41731.37.out:Local time: Wed Oct 13 16:25:29 CEST 2021
./g1/job_1048/condor.41731.47.out:Local time: Wed Oct 13 16:25:29 CEST 2021
./g2/job_98/condor.41726.97.out:Local time: Wed Oct 13 15:58:51 CEST 2021
./g2/job_99/condor.41726.98.out:Local time: Wed Oct 13 15:58:53 CEST 2021
./g3/job_1137/condor.41731.136.out:Local time: Wed Oct 13 16:26:53 CEST 2021
./g3/job_1138/condor.41731.137.out:Local time: Wed Oct 13 16:26:53 CEST 2021
./g4/job_1169/condor.41731.168.out:Local time: Wed Oct 13 16:27:32 CEST 2021
./g4/job_1170/condor.41731.169.out:Local time: Wed Oct 13 16:27:31 CEST 2021
./g5/job_527/condor.41729.133.out:Local time: Wed Oct 13 16:18:54 CEST 2021
./g5/job_530/condor.41729.136.out:Local time: Wed Oct 13 16:18:54 CEST 2021
./g5/job_531/condor.41729.137.out:Local time: Wed Oct 13 16:18:54 CEST 2021
./g6/job_4623/condor.41780.47.out:Local time: Wed Oct 13 17:34:21 CEST 2021
./g6/job_4635/condor.41780.59.out:Local time: Wed Oct 13 17:34:21 CEST 2021

makortel · 2022-03-14T16:02:49Z

Thanks @khurtado. Can you tell if the affected hosts have /dev/urandom? Or check contents of /proc/sys/kernel/random/entropy_avail on them?

khurtado · 2022-03-14T16:16:29Z

I unfortunately don't have direct ssh access to these machines. I can probably submit some condor jobs matching to these hosts, but I don't know how long they would take to match and run. I will check if there is anybody with direct access to them for a quick check or submit those jobs otherwise.

Do you know if /dev/urandom and /proc/sys/kernel/random/entropy_avail can vary depending on whether they run inside a singularity container or not by the way? We run these jobs inside containers in production.

dan131riley · 2022-03-14T19:07:45Z

Am I reading the logs correctly, that the duplicates are all in the DQMIO output? DQMIO does not use the code Matti pointed to, it calls TFile::GetUUID() instead:

cmssw/DQMServices/FwkIO/plugins/DQMRootOutputModule.cc

Lines 327 to 338 in ce4f5b2

    
           void DQMRootOutputModule::openFile(edm::FileBlock const&) { 
        
             //NOTE: I need to also set the I/O performance settings 
        
             m_file = std::make_unique<TFile>(m_fileName.c_str(), 
        
                                              "RECREATE", 
        
                                              "1"  //This is the file format version number 
        
             ); 
        
             edm::Service<edm::JobReport> jr; 
        
             cms::Digest branchHash; 
        
             std::string guid{m_file->GetUUID().AsString()}; 
        
             std::transform(guid.begin(), guid.end(), guid.begin(), (int (*)(int))std::toupper);

That UUID comes from TUUID(), see comments here: https://github.com/root-project/root/blob/bd7c94375627ae10a401543ac84f296f5386c874/core/base/src/TUUID.cxx#L24-L30 TUUID() only implements the older UUID generation algorithm that uses the system time and ethernet address. We actually had to switch away from that algorithm to the one that uses /dev/urandom because we were getting duplicates in docker containers, as apparently containers don't guarantee clock monotonicity across different containers on the same system.

So, if it is just the DQMIO getting duplicates, that's not unexpected and the issue is with the DQM use of the ROOT UUID.

makortel · 2022-03-14T19:44:05Z

DQMIO does not use the code Matti pointed to,

On a closer look my reference to edm::processGUID() was incorrect anyway, RootOutputFile doesn't use it either but calls edm::createGlobalIdentifier()

cmssw/IOPool/Output/src/RootOutputFile.cc

Line 199 in ce4f5b2

fid_ = FileID(createGlobalIdentifier());

cmssw/IOPool/Output/src/RootOutputFile.cc

Lines 230 to 239 in ce4f5b2

    
           Service<JobReport> reportSvc; 
        
           reportToken_ = reportSvc->outputFileOpened(file_, 
        
                                                      logicalFile_,        // PFN and LFN 
        
                                                      om_->catalog(),      // catalog 
        
                                                      moduleName,          // module class name 
        
                                                      om_->moduleLabel(),  // module label 
        
                                                      fid_.fid(),          // file id (guid) 
        
                                                      std::string(),       // data type (not yet known, so string is empty). 
        
                                                      md5alg.digest().toString(),  // branch hash 
        
                                                      branchNames);                // branch names being written

edm::createGlobalIdentifier() itself is just

cmssw/FWCore/Utilities/src/GlobalIdentifier.cc

Lines 5 to 8 in ce4f5b2

    
           std::string createGlobalIdentifier(bool binary) { 
        
             Guid guid; 
        
             return binary ? guid.toBinary() : guid.toString(); 
        
           }

I see I changed the DQMIO output behavior from edm::createGlobalIdentifier() to TFile::GetUUID() in #28551 to fix inconsistency between DQMIO input and output that was reported in #28534.

Then I see #28622 removed the whole call to edm::JobReport::inputFileOpened() from DQMRootSource (?!) that used the TFile::GetUUID().

So on one hand, we could easily change the DQMRootOutputModule to use edm::createGlobalIdentifier() without worrying the consistency raised in #28534, but on the other hand, should DQMRootSource report inputFileOpened()?

khurtado · 2022-03-14T19:44:12Z

@dan131riley We do see more occurrences in DQMIO, but If you look at the json in the g3 or or g4 directories from the T0 folks, you will see there are other datatiers with the problem. E.g.:

  "dup_lfns": [
      "/store/unmerged/data/Tier0_REPLAY_2021/StreamCalibration/ALCARECO/Express-v2110131547/000/343/082/00001/a48e105e-4352-4d0e-a084-cb077219d1dd.root",
      "/store/unmerged/data/Tier0_REPLAY_2021/StreamCalibration/ALCARECO/Express-v2110131547/000/343/082/00001/a48e105e-4352-4d0e-a084-cb077219d1dd.root",
      "/store/unmerged/data/Tier0_REPLAY_2021/StreamCalibration/DQMIO/Express-v2110131547/000/343/082/00001/891C47F4-2C31-11EC-BA14-95C08E80BEEF.root",
      "/store/unmerged/data/Tier0_REPLAY_2021/StreamCalibration/DQMIO/Express-v2110131547/000/343/082/00001/891C47F4-2C31-11EC-BA14-95C08E80BEEF.root",
      "/store/unmerged/data/Tier0_REPLAY_2021/TestEnablesEcalHcal/RAW/Express-v2110131547/000/343/082/00001/523ec1e8-286f-47b2-b0a0-5534dbd7c492.root",
      "/store/unmerged/data/Tier0_REPLAY_2021/TestEnablesEcalHcal/RAW/Express-v2110131547/000/343/082/00001/523ec1e8-286f-47b2-b0a0-5534dbd7c492.root",
      "/store/unmerged/data/logs/prod/2021/10/13/Express_Run343082_StreamCalibration_Tier0_REPLAY_2021_v2110131547_211013_1547/Express/0001/0/Express-ac5ffd57-dc01-493f-ba17-951d97d7a523-0-logArchive.tar.gz",
      "/store/unmerged/data/logs/prod/2021/10/13/Express_Run343082_StreamCalibration_Tier0_REPLAY_2021_v2110131547_211013_1547/Express/0001/0/Express-ac5ffd57-dc01-493f-ba17-951d97d7a523-0-logArchive.tar.gz"
    ]
  },

(The logArchive.tar.gz are using our own uuid mechanism from python, so we need to fix that independently of the ROOT files).

Question from someone not knowledgeable on the topic: If we have this known problem with DQMIO, why can't this output type use the new UUID generation algorithm too?

makortel · 2022-03-14T19:53:43Z

(FYI @cms-sw/dqm-l2 since we mentioned DQM modules)

dan131riley · 2022-03-15T19:10:00Z

@dan131riley We do see more occurrences in DQMIO, but If you look at the json in the g3 or or g4 directories from the T0 folks, you will see there are other datatiers with the problem.

It seems weird that the dups are either just DQMIO, or all of ALCARECO, DQMIO, RAW, and the logArchive. The actual logs only cover the DQMIO case--can we get some logs for jobs where the whole set is duplicated? I think we understand the DQMIO-only case, but the other case is still a mystery to me.

Question from someone not knowledgeable on the topic: If we have this known problem with DQMIO, why can't this output type use the new UUID generation algorithm too?

It got overlooked--until I started investigating this issue, I hadn't realized TFile::TUUID() was using the old algorithm.

khurtado · 2022-03-24T19:05:49Z

@makortel @dan131riley Sorry for the delay. We found a bug in the script that finds these duplicated LFNs. After fixing it, it seems the only problem is DQMIO.

drkovalskyi · 2022-03-29T13:14:30Z

Hi everyone. This issue affects the Tier0 operations and the detector commissioning. Is there any chance to speed it up?

qliphy · 2022-03-29T13:48:27Z

@cms-sw/dqm-l2 @makortel Any follow up on this? How about the fix proposed by Matti #37240 (comment) ?

makortel · 2022-03-29T13:56:53Z

@dan131riley is looking into this

dan131riley · 2022-03-29T14:13:26Z

We will need to switch back to the createGlobalIdentifier(), I'm still looking into whether we can restore the DQMIO files to the input files FJR, I should have a PR tomorrow at the latest.

drkovalskyi · 2022-03-29T14:16:20Z

Thanks Dan.

perrotta · 2022-03-29T14:24:42Z

We will need to switch back to the createGlobalIdentifier(), I'm still looking into whether we can restore the DQMIO files to the input files FJR, I should have a PR tomorrow at the latest.

If this can be available by tomorrow, as you write, we can wait for building CMSSW_12_2_2 till then (otherwise we would be even ready to build it even now)

drkovalskyi · 2022-03-29T14:31:18Z

Andrea, this problem is what caused Express failure last weekend. Our operators noticed it by chance (we don't normally have coverage during weekends). The risk is that it may happen again and we can be blind for a few days. If you have no strong pressure to release 12_2_2 now, let's wait for the fix. Otherwise we will need a patch release right after that.

perrotta · 2022-03-29T14:34:33Z

Andrea, this problem is what caused Express failure last weekend. Our operators noticed it by chance (we don't normally have coverage during weekends). The risk is that it may happen again and we can be blind for a few days. If you have no strong pressure to release 12_2_2 now, let's wait for the fix. Otherwise we will need a patch release right after that.

That is exactly what I meant: if the PR is ready by tomorrow(ish), we can wait and build 12_2_2 with it.
Otherwise we build 12_2_2 now, since there are other requests for it, and another patch later on when the fix is available (not the preferred option)

dan131riley · 2022-03-29T23:42:16Z

#37405 has the PR for master (comments and criticisms are welcome). Backports will likely wait until tomorrow morning (US EDT).

germanfgv · 2022-04-01T11:45:04Z

Hi @perrotta @dan131riley, thank you for you prompt actions. I see that this has been backported into CMSSW_12_2_X. I would like to know, when will the patch release be available? I'm guessing it will be CMSSW_12_2_2_patch1.

qliphy · 2022-04-01T11:49:59Z

Hi @perrotta @dan131riley, thank you for you prompt actions. I see that this has been backported into CMSSW_12_2_X. I would like to know, when will the patch release be available? I'm guessing it will be CMSSW_12_2_2_patch1.

@germanfgv yes, this will be included in CMSSW_12_2_2_patch1. We are just trying to include another PR: #37417 (to be backported) Hopefully 12_2_2_patch1 can be made in the weekend.

drkovalskyi · 2022-04-01T12:30:49Z

The issue is that we need the patch release before the weekend. Without this fix we risk Tier0 going down during the weekend. Is there any chance to get it today?

makortel · 2022-04-01T12:45:12Z

I think it would be better to proceed without #37417 (even if it would lead to two separate patch releases).

perrotta · 2022-04-01T13:07:50Z

CMSSW_12_2_3 is going to be built: #37433

germanfgv · 2022-04-01T15:46:16Z

@perrotta the release is built! how long would it be until it is updated in /cvmfs?

germanfgv · 2022-04-01T15:49:19Z

ohh.. I see the process is still going on for slc7_amd64_gcc900. Nvm!

perrotta · 2022-04-01T16:37:26Z

@perrotta the release is built! how long would it be until it is updated in /cvmfs?

At 3pm we said that the release will take "a few hours" and that it would have been hopefully ready before evening at Fermilab: we are still in track, I guess...

davidlange6 · 2022-04-01T16:41:52Z

Yea, sorry I missed the fact that it was full build at 3pm - seems to rely on someone working through the fnal evening to make this converge (at best). Given that no one spoke for this extra development its unfortunate that we make someone work Friday evening just for it.

…

On Apr 1, 2022, at 6:37 PM, Andrea Perrotta ***@***.***> wrote: @perrotta the release is built! how long would it be until it is updated in /cvmfs? At 3pm we said that the release will take "a few hours" and that it would have been hopefully ready before evening at Fermilab: we are still in track, I guess... — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.

davidlange6 · 2022-04-01T16:46:18Z

Probably a good reason to recover the ability to start branches in GitHub to facilitate patches in cases where the tip of the release branch has moved forward in some way. Useful for data taking.

…

On Apr 1, 2022, at 6:42 PM, David Lange ***@***.***> wrote: Yea, sorry I missed the fact that it was full build at 3pm - seems to rely on someone working through the fnal evening to make this converge (at best). Given that no one spoke for this extra development its unfortunate that we make someone work Friday evening just for it. > On Apr 1, 2022, at 6:37 PM, Andrea Perrotta ***@***.***> wrote: > > > @perrotta the release is built! how long would it be until it is updated in /cvmfs? > > At 3pm we said that the release will take "a few hours" and that it would have been hopefully ready before evening at Fermilab: we are still in track, I guess... > > — > Reply to this email directly, view it on GitHub, or unsubscribe. > You are receiving this because you are subscribed to this thread. > — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.

perrotta · 2022-04-01T16:49:59Z

@davidlange6 CMSSW_12_2_2 full build took less than six hous two days ago. That's why I asked today at the joint meeting by when it was needed, And the answer was "before this evening at Fermilab". If I am not wrong now it is almost noon at Fermilab, and I think we are perfectly in schedule for what was asked for.

perrotta · 2022-04-01T19:19:37Z

Release CMSSW_12_2_3 is ready, see https://github.com/cms-sw/cmssw/releases/tag/CMSSW_12_2_3

germanfgv · 2022-04-01T21:23:31Z

Thanks @perrotta. It is not in cvmfs yet, but we will try it as soon as it gets there.

dan131riley · 2022-04-14T15:43:48Z

Ping…can this issue be resolved?

makortel · 2022-04-14T15:52:06Z

@germanfgv @drkovalskyi Could you confirm that the issues with duplicated GUIDs are gone? (I'd assume so from the silence, but would like to check explicitly) Thanks!

jhonatanamado · 2022-04-14T18:41:07Z

Hello @makortel , From Tier0 we can confirm that the issues with duplicated GUIDs are gone since CMSSW_12_2_3. Thanks.

makortel · 2022-04-14T18:44:07Z

+1

Thanks @jhonatanamado

cmsbuild · 2022-04-14T18:44:26Z

This issue is fully signed and ready to be closed.

cmsbuild added the pending-assignment label Mar 14, 2022

cmsbuild added core-pending pending-signatures and removed pending-assignment labels Mar 14, 2022

khurtado changed the title ~~ROOT files with duplicated GUIDs observed on priductioin T0 replay workflows~~ ROOT files with duplicated GUIDs observed on production T0 replay workflows Mar 14, 2022

khurtado mentioned this issue Mar 14, 2022

T0 JobAccountant crashes due to multiple jobs generating same logArchive files dmwm/WMCore#11038

Closed

khurtado mentioned this issue Mar 15, 2022

T0 JobAccountant crashes due to multiple jobs generating same file dmwm/WMCore#10870

Closed

dan131riley mentioned this issue Mar 29, 2022

Avoid DQMIO file GUID collisions #37405

Merged

makortel mentioned this issue Mar 30, 2022

Avoid DQMIO file GUID collisions cms-sw/framework-team#375

Closed

3 tasks

cmsbuild removed core-pending pending-signatures labels Apr 14, 2022

cmsbuild added core-approved fully-signed labels Apr 14, 2022

qliphy closed this as completed Apr 14, 2022

ROOT files with duplicated GUIDs observed on production T0 replay workflows #37240

ROOT files with duplicated GUIDs observed on production T0 replay workflows #37240

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