sandynz commented on pull request #12267:
URL: https://github.com/apache/shardingsphere/pull/12267#issuecomment-914279259
Consumer (`PGReplicationStream`) must be closed before drop replication
slot, else exception thrown:
```
o.a.s.s.c.j.p.ScalingJobPreparer - Scaling job destroying failed
org.postgresql.util.PSQLException: ERROR: replication slot
"sharding_scaling" is active for PID 76289
at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2440)
at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2183)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:308)
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:441)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:365)
at
org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:143)
at
org.postgresql.jdbc.PgPreparedStatement.execute(PgPreparedStatement.java:132)
at
com.zaxxer.hikari.pool.ProxyPreparedStatement.execute(ProxyPreparedStatement.java:44)
at
com.zaxxer.hikari.pool.HikariProxyPreparedStatement.execute(HikariProxyPreparedStatement.java)
at
org.apache.shardingsphere.scaling.postgresql.component.PostgreSQLPositionInitializer.dropSlotIfExists(PostgreSQLPositionInitializer.java:116)
at
org.apache.shardingsphere.scaling.postgresql.component.PostgreSQLPositionInitializer.destroy(PostgreSQLPositionInitializer.java:103)
at
org.apache.shardingsphere.scaling.core.job.preparer.ScalingJobPreparer.cleanup(ScalingJobPreparer.java:113)
at
org.apache.shardingsphere.scaling.core.job.schedule.JobScheduler.stop(JobScheduler.java:57)
at
org.apache.shardingsphere.scaling.core.job.schedule.JobSchedulerCenter.stop(JobSchedulerCenter.java:76)
at
org.apache.shardingsphere.scaling.core.executor.job.ScalingJobExecutor.lambda$watchGovernanceRepositoryConfiguration$0(ScalingJobExecutor.java:62)
at
org.apache.shardingsphere.mode.repository.cluster.zookeeper.CuratorZookeeperRepository.lambda$watch$1(CuratorZookeeperRepository.java:247)
at
org.apache.curator.framework.recipes.cache.TreeCacheListenerWrapper.sendEvent(TreeCacheListenerWrapper.java:71)
at
org.apache.curator.framework.recipes.cache.TreeCacheListenerWrapper.event(TreeCacheListenerWrapper.java:48)
at
org.apache.curator.framework.recipes.cache.CuratorCacheListenerBuilderImpl$2.lambda$event$0(CuratorCacheListenerBuilderImpl.java:149)
at java.util.ArrayList.forEach(ArrayList.java:1259)
at
org.apache.curator.framework.recipes.cache.CuratorCacheListenerBuilderImpl$2.event(CuratorCacheListenerBuilderImpl.java:149)
at
org.apache.curator.framework.recipes.cache.CuratorCacheImpl.lambda$putStorage$6(CuratorCacheImpl.java:274)
at
org.apache.curator.framework.listen.MappingListenerManager.lambda$forEach$0(MappingListenerManager.java:92)
at
org.apache.curator.framework.listen.MappingListenerManager.forEach(MappingListenerManager.java:89)
at
org.apache.curator.framework.listen.StandardListenerManager.forEach(StandardListenerManager.java:89)
at
org.apache.curator.framework.recipes.cache.CuratorCacheImpl.lambda$callListeners$10(CuratorCacheImpl.java:293)
at
java.util.concurrent.CompletableFuture$AsyncRun.run$$$capture(CompletableFuture.java:1640)
at
java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
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