Atlas 503 Service Unavailable without errors in log
From Cloudera Manager it appears like Atlas Service is in good health, but it doesn't start at all. When I try to access the Web UI, it shows an Http Error 503 Service Unavailable but the application.log doesn't show any error; it just halts.
Here is the application.log whe I restart Atlas service from Cloudera Manager:
2022-01-31 12:04:28,657 INFO - [shutdown-hook-0:] ~ ==> Shutdown of Atlas (Atlas$1:63)
2022-01-31 12:04:28,668 INFO - [shutdown-hook-0:] ~ <== Shutdown of Atlas (Atlas$1:69)
2022-01-31 12:09:49,319 INFO - [main:] ~ Loading atlas-application.properties from file:/var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlas-application.properties (ApplicationProperties:137)
2022-01-31 12:09:49,327 INFO - [main:] ~ Using graphdb backend 'janus' (ApplicationProperties:317)
2022-01-31 12:09:49,327 INFO - [main:] ~ Using storage backend 'hbase2' (ApplicationProperties:328)
2022-01-31 12:09:49,327 INFO - [main:] ~ Using index backend 'solr' (ApplicationProperties:339)
2022-01-31 12:09:49,328 INFO - [main:] ~ Atlas is running in MODE: PROD. (ApplicationProperties:343)
2022-01-31 12:09:49,328 INFO - [main:] ~ Setting solr-wait-searcher property 'true' (ApplicationProperties:349)
2022-01-31 12:09:49,329 INFO - [main:] ~ Setting index.search.map-name property 'false' (ApplicationProperties:353)
2022-01-31 12:09:49,329 INFO - [main:] ~ Using atlas.graph.index.search.max-result-set-size = 500000 (ApplicationProperties:363)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.db-cache = true (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.db-cache-clean-wait = 20 (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.db-cache-size = 0.5 (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.tx-cache-size = 15000 (ApplicationProperties:375)
2022-01-31 12:09:49,329 INFO - [main:] ~ Property (set to default) atlas.graph.cache.tx-dirty-size = 120 (ApplicationProperties:375)
2022-01-31 12:09:49,335 INFO - [main:] ~
########################################################################################
Atlas Server (STARTUP)
project.name: apache-atlas
project.description: Metadata Management and Data Governance Platform over Hadoop
build.user: jenkins
build.epoch: 1615291035511
project.version: 2.1.0.7.1.6.0-297
build.version: 2.1.0.7.1.6.0-297
vc.revision: 0b549aa29de55ea44b7e05e11c689dfc424802b0
vc.source.url: scm:git:git://git.apache.org/atlas.git/atlas-webapp
######################################################################################## (Atlas:215)
2022-01-31 12:09:49,335 INFO - [main:] ~ >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> (Atlas:216)
2022-01-31 12:09:49,335 INFO - [main:] ~ Server starting with TLS ? true on port 31443 (Atlas:217)
2022-01-31 12:09:49,336 INFO - [main:] ~ <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< (Atlas:218)
2022-01-31 12:09:49,362 INFO - [main:] ~ Attempting to retrieve password for key keystore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,630 INFO - [main:] ~ Attempting to retrieve password for key truststore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,779 INFO - [main:] ~ Attempting to retrieve password for key keystore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,871 INFO - [main:] ~ Attempting to retrieve password for key password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)
2022-01-31 12:09:49,959 INFO - [main:] ~ Attempting to retrieve password for key truststore.password from cert.stores.credential.provider.path configured credential provider path localjceks://file//var/run/cloudera-scm-agent/process/6754-atlas-ATLAS_SERVER/conf/atlascreds.localjceks (SecurityUtil:63)

