marktrue commented on issue #8525:
URL: https://github.com/apache/shardingsphere/issues/8525#issuecomment-742421804
it seems happened only when query show tables;
<pre>
<code>
[INFO ] 10:04:56.804 [ShardingSphere-Command-7] ShardingSphere-SQL - Logic
SQL: select * from gk_user
[INFO ] 10:04:56.804 [ShardingSphere-Command-7] ShardingSphere-SQL -
SQLStatement: MySQLSelectStatement(limit=Optional.empty, lock=Optional.empty)
[INFO ] 10:04:56.804 [ShardingSphere-Command-7] ShardingSphere-SQL - Actual
SQL: replica_ds_0 ::: select * from gk_user
[INFO ] 10:05:35.266 [ShardingSphere-Command-8] ShardingSphere-SQL - Logic
SQL: show tables
[INFO ] 10:05:35.267 [ShardingSphere-Command-8] ShardingSphere-SQL -
SQLStatement: MySQLShowTablesStatement(fromSchema=Optional.empty)
[INFO ] 10:05:35.267 [ShardingSphere-Command-8] ShardingSphere-SQL - Actual
SQL: pr_ds ::: show tables
[ERROR] 10:05:35.268 [ShardingSphere-Command-8]
o.a.s.p.f.c.CommandExecutorTask - Exception occur:
java.lang.NullPointerException: Can not get connection from datasource pr_ds.
at
com.google.common.base.Preconditions.checkNotNull(Preconditions.java:987)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.datasource.JDBCBackendDataSource.getConnections(JDBCBackendDataSource.java:80)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.datasource.JDBCBackendDataSource.getConnections(JDBCBackendDataSource.java:62)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.connection.BackendConnection.getConnectionsWithoutTransaction(BackendConnection.java:141)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.connection.BackendConnection.getConnections(BackendConnection.java:102)
at
org.apache.shardingsphere.infra.executor.sql.resourced.group.ResourceManagedExecuteGroupEngine.generateSQLExecuteGroups(ResourceManagedExecuteGroupEngine.java:66)
at
org.apache.shardingsphere.infra.executor.sql.group.AbstractExecuteGroupEngine.generate(AbstractExecuteGroupEngine.java:58)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.execute.engine.jdbc.JDBCExecuteEngine.generateInputGroups(JDBCExecuteEngine.java:140)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.execute.engine.jdbc.JDBCExecuteEngine.executeWithManagedResource(JDBCExecuteEngine.java:130)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.execute.engine.jdbc.JDBCExecuteEngine.execute(JDBCExecuteEngine.java:123)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.execute.engine.jdbc.JDBCExecuteEngine.execute(JDBCExecuteEngine.java:103)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.doExecute(JDBCDatabaseCommunicationEngine.java:93)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:79)
at
org.apache.shardingsphere.proxy.backend.text.admin.ShowTablesBackendHandler.execute(ShowTablesBackendHandler.java:65)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:62)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:100)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:76)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
</code>
</pre>
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