Hi,

Recently, we have a time consuming issue when parsing 120+ YANG models with ODL yang tools version 3.0.5, it takes more than 10 mins.

Let me try to describe the steps reproducing this issue.
1.Download all YANG models from server, and writing them to files.
2.Feed all YANG models files to ODL, we called the following API.

parseSources(StatementParserMode.DEFAULT_MODE, null,files.stream().map(YangTextSchemaSource::forFile).collect(Collectors.toList()))
private SchemaContext parseSources(final StatementParserMode parserMode, final Set<QName> supportedFeatures,
 final Collection<? extends SchemaSourceRepresentation> sources) throws YangParserException, IOException {
 YangParserFactory factory = new YangParserFactoryImpl();
 final YangParser parser = factory.createParser(parserMode);
 if (supportedFeatures != null) {
 parser.setSupportedFeatures(supportedFeatures);
 }
 parser.addSources(sources);
 return parser.buildSchemaContext();
 }

I checked the ODL source code in deeper, main code snippet as below:

for (final ModelProcessingPhase phase : PHASE_EXECUTION_ORDER) {
 startPhase(phase);
 loadPhaseStatements();
 completePhaseActions();
 endPhase(phase);
 }

Main problems happened in last phase ModelProcessingPhase.EFFECTIVE_MODEL marked by red , I tried to extract main logs and see the last phase takes more than 10 mins.

2020-03-19T08:05:54,275 DEBUG  Global phase SOURCE_PRE_LINKAGE started

…

2020-03-19T08:06:14,994 DEBUG  Global phase SOURCE_PRE_LINKAGE finished

2020-03-19T08:06:16,691 DEBUG  Global phase SOURCE_LINKAGE started

…

2020-03-19T08:06:39,595 DEBUG  Global phase SOURCE_LINKAGE finished

2020-03-19T08:06:41,549 DEBUG  Global phase STATEMENT_DEFINITION started

…

2020-03-19T08:06:45,642 DEBUG  Global phase STATEMENT_DEFINITION finished

2020-03-19T08:06:47,325 DEBUG  Global phase FULL_DECLARATION started

…

2020-03-19T08:08:42,069 DEBUG  Global phase FULL_DECLARATION finished

2020-03-19T08:08:43,726 DEBUG  Global phase EFFECTIVE_MODEL started

…

2020-03-19T08:19:34,745 DEBUG  Global phase EFFECTIVE_MODEL finished

Meanwhile, I also run unit test for YANG parser method at the same environment, it is weird that unit test running is quite fast.

Also,stack trace tree of runtime is attached for your reference.

We are blocked by this issue for a long time,could you please help look into it with high priority?

Thanks