Sync schema flaky behavior

We have a database containing 18 tables. Every time we manually trigger schema sync, the detected number of tables flips between 18 and 5. Is this caused by Metabase bugs or wrong configuration?

[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:09+08:00 DEBUG metabase.server.middleware.log POST /api/database/63/sync_schema 200 8.6 ms (1 DB calls) App DB connections: 0/15 Jetty threads: 4/50 (3 idle, 0 queued) (322 total active threads) Queries in flight: 0 (0 queued)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:09+08:00 INFO metabase.sync.util STARTING: Sync metadata for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:09+08:00 INFO metabase.sync.util STARTING: step 'sync-timezone' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:09+08:00 INFO metabase.sync.util FINISHED: step 'sync-timezone' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (75.2 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:09+08:00 INFO metabase.sync.util STARTING: step 'sync-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:09+08:00 INFO metabase.sync.sync-metadata.tables Found new tables: (Table  'taskcollection' Table  'taskexecution' Table  'dailyusagereportbyteam' Table  'taskcollectionassociation' Table  'usertaskquota' Table  'tasktagassociation' Table  'taskresult' Table  'dailyusagereportbyuser' Table  'taskrunner' Table  'dailyusagereportbyproject' Table  'pendingnotification' Table  'taskexecutionmetrics' Table  'task')
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 INFO metabase.sync.util FINISHED: step 'sync-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (832.2 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 INFO metabase.sync.util STARTING: step 'sync-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 INFO metabase.sync.sync-metadata.tables Updating description for tables: (Table  'dailyusagereportbyteam' Table  'tasktagassociation' Table  'dailyusagereportbyproject' Table  'taskexecutionmetrics' Table  'taskcollectionassociation' Table  'pendingnotification' Table  'dailyusagereportbyuser' Table  'taskresult' Table  'usertaskquota' Table  'taskrunner' Table  'taskcollection' Table  'taskexecution' Table  'task')
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:10+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util FINISHED: step 'sync-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (963.7 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util STARTING: step 'sync-fks' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util FINISHED: step 'sync-fks' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (390.4 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util STARTING: step 'sync-metabase-metadata' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util FINISHED: step 'sync-metabase-metadata' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (192.7 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util FINISHED: Sync metadata for mysql Database 63 'Cloud Scheduler Aliyun RDS' (2.5 s)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util STARTING: Analyze data for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util STARTING: step 'fingerprint-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.analyze fingerprint-fields Analyzed [*****·············································] 😢   11% Table 3,361 'PendingNotification'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.analyze fingerprint-fields Analyzed [**********········································] 😒   22% Table 5,093 'tasketa'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.analyze fingerprint-fields Analyzed [****************··································] 😕   33% Table 3,693 'UserTaskQuota'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util FINISHED: step 'fingerprint-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (163.7 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.util STARTING: step 'classify-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:11+08:00 INFO metabase.sync.analyze classify-fields Analyzed [*********************·····························] 😐   44% Table 3,361 'PendingNotification'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.analyze classify-fields Analyzed [***************************·······················] 😌   55% Table 5,093 'tasketa'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.analyze classify-fields Analyzed [********************************··················] 😏   65% Table 3,693 'UserTaskQuota'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.util FINISHED: step 'classify-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (145.3 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.util STARTING: step 'classify-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.analyze classify-tables Analyzed [**************************************············] 😋   76% Table 3,361 'PendingNotification'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.analyze classify-tables Analyzed [*******************************************·······] 😊   87% Table 5,093 'tasketa'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.analyze classify-tables Analyzed [*************************************************·] 😎   98% Table 3,693 'UserTaskQuota'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.util FINISHED: step 'classify-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (134.6 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:12+08:00 INFO metabase.sync.util FINISHED: Analyze data for mysql Database 63 'Cloud Scheduler Aliyun RDS' (532.4 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:18+08:00 INFO metabase.api.card Question's average execution duration is 19.8 s; using 'magic' TTL of 39.7 mins 💾
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:27+08:00 INFO metabase.api.card Question's average execution duration is 19.8 s; using 'magic' TTL of 39.7 mins 💾
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:27+08:00 DEBUG metabase.server.middleware.log POST /api/database/63/sync_schema 200 8.7 ms (1 DB calls) App DB connections: 0/15 Jetty threads: 3/50 (4 idle, 0 queued) (327 total active threads) Queries in flight: 2 (0 queued)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:27+08:00 INFO metabase.sync.util STARTING: Sync metadata for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:27+08:00 INFO metabase.sync.util STARTING: step 'sync-timezone' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:27+08:00 INFO metabase.sync.util FINISHED: step 'sync-timezone' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (18.4 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:27+08:00 INFO metabase.sync.util STARTING: step 'sync-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:27+08:00 INFO metabase.sync.sync-metadata.tables Found new tables: (Table  'taskcollection' Table  'taskexecution' Table  'dailyusagereportbyteam' Table  'taskcollectionassociation' Table  'usertaskquota' Table  'tasktagassociation' Table  'taskresult' Table  'dailyusagereportbyuser' Table  'taskrunner' Table  'dailyusagereportbyproject' Table  'pendingnotification' Table  'taskexecutionmetrics' Table  'task')
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.sync-metadata.tables Marking tables as inactive: (Table  'DailyUsageReportByUser' Table  'UserTaskQuota' Table  'DailyUsageReportByTeam' Table  'TaskExecutionMetrics' Table  'PendingNotification' Table  'TaskCollection' Table  'DailyUsageReportByProject' Table  'TaskResult' Table  'Task' Table  'TaskCollectionAssociation' Table  'TaskRunner' Table  'TaskExecution' Table  'TaskTagAssociation')
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.util FINISHED: step 'sync-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (1.4 s)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.util STARTING: step 'sync-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.sync-metadata.tables Updating description for tables: (Table  'dailyusagereportbyteam' Table  'tasktagassociation' Table  'dailyusagereportbyproject' Table  'taskexecutionmetrics' Table  'taskcollectionassociation' Table  'pendingnotification' Table  'dailyusagereportbyuser' Table  'taskresult' Table  'usertaskquota' Table  'taskrunner' Table  'taskcollection' Table  'taskexecution' Table  'task')
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 WARN metabase.driver.sql-jdbc.sync.describe-table Don't know how to map column type 'JSON' to a Field base_type, falling back to :type/*.
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.util FINISHED: step 'sync-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (271.1 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.util STARTING: step 'sync-fks' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.util FINISHED: step 'sync-fks' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (104.6 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:28+08:00 INFO metabase.sync.util STARTING: step 'sync-metabase-metadata' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util FINISHED: step 'sync-metabase-metadata' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (197.0 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util FINISHED: Sync metadata for mysql Database 63 'Cloud Scheduler Aliyun RDS' (2.0 s)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util STARTING: Analyze data for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util STARTING: step 'fingerprint-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.analyze fingerprint-fields Analyzed [******············································] 😞   13% Table 5,780 'dailyusagereportbymodule'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.analyze fingerprint-fields Analyzed [************······································] 😒   25% Table 5,613 'servicevariables'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util FINISHED: step 'fingerprint-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (46.6 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util STARTING: step 'classify-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.analyze classify-fields Analyzed [******************································] 😐   38% Table 2,709 'alembic_version'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.analyze classify-fields Analyzed [*************************·························] 😬   50% Table 5,010 'pendingtaskdetail'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.analyze classify-fields Analyzed [*******************************···················] 😏   63% Table 5,093 'tasketa'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util FINISHED: step 'classify-fields' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (41.2 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util STARTING: step 'classify-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.analyze classify-tables Analyzed [*************************************·············] 😋   75% Table 5,780 'dailyusagereportbymodule'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.analyze classify-tables Analyzed [*******************************************·······] 😍   88% Table 5,613 'servicevariables'
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util FINISHED: step 'classify-tables' for mysql Database 63 'Cloud Scheduler Aliyun RDS' (42.0 ms)
[95cd62de-f179-4cd9-b94c-cbfd63c6d27e] 2023-06-29T18:57:29+08:00 INFO metabase.sync.util FINISHED: Analyze data for mysql Database 63 'Cloud Scheduler Aliyun RDS' (218.0 ms)
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Make sure to upgrade to the latest version 46.5 since you are in a very old version so it's hard to debug