marktrue edited a comment 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>
append another log
<pre>
<code>
[INFO ] 10:13:13.789 [ShardingSphere-Command-12] ShardingSphere-SQL - Logic
SQL: SELECT QUERY_ID, SUM(DURATION) AS SUM_DURATION FROM
INFORMATION_SCHEMA.PROFILING GROUP BY QUERY_ID
[INFO ] 10:13:13.789 [ShardingSphere-Command-12] ShardingSphere-SQL -
SQLStatement: MySQLSelectStatement(limit=Optional.empty, lock=Optional.empty)
[INFO ] 10:13:13.790 [ShardingSphere-Command-12] ShardingSphere-SQL - Actual
SQL: replica_ds_1 ::: SELECT QUERY_ID, SUM(DURATION) AS SUM_DURATION FROM
INFORMATION_SCHEMA.PROFILING GROUP BY QUERY_ID
line 1:81 no viable alternative at input
'SELECTSTATEAS`状态`,ROUND(SUM(DURATION),7)AS`期间`,CONCAT(ROUND(SUM(DURATION)/*'
line 1:81 no viable alternative at input
'SELECTSTATEAS`状态`,ROUND(SUM(DURATION),7)AS`期间`,CONCAT(ROUND(SUM(DURATION)/*'
[ERROR] 10:13:13.815 [ShardingSphere-Command-13]
o.a.s.p.f.c.CommandExecutorTask - Exception occur:
org.antlr.v4.runtime.misc.ParseCancellationException: null
at
org.antlr.v4.runtime.BailErrorStrategy.recover(BailErrorStrategy.java:51)
at
org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.select(MySQLStatementParser.java:3631)
at
org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.execute(MySQLStatementParser.java:936)
at
org.apache.shardingsphere.sql.parser.mysql.parser.MySQLParser.parse(MySQLParser.java:37)
at
org.apache.shardingsphere.sql.parser.core.parser.SQLParserExecutor.twoPhaseParse(SQLParserExecutor.java:84)
at
org.apache.shardingsphere.sql.parser.core.parser.SQLParserExecutor.parse(SQLParserExecutor.java:59)
at
org.apache.shardingsphere.sql.parser.core.parser.SQLParserExecutor.parse(SQLParserExecutor.java:53)
at
org.apache.shardingsphere.sql.parser.api.SQLParserEngine.parse(SQLParserEngine.java:46)
at
org.apache.shardingsphere.infra.parser.sql.SQLStatementParserEngine.parse(SQLStatementParserEngine.java:65)
at
org.apache.shardingsphere.infra.parser.sql.SQLStatementParserEngine.parse(SQLStatementParserEngine.java:53)
at
org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine.parse0(ShardingSphereSQLParserEngine.java:74)
at
org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine.parse(ShardingSphereSQLParserEngine.java:60)
at
org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandlerFactory.newInstance(TextProtocolBackendHandlerFactory.java:63)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.<init>(MySQLComQueryPacketExecutor.java:54)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.MySQLCommandExecutorFactory.newInstance(MySQLCommandExecutorFactory.java:70)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.MySQLCommandExecuteEngine.getCommandExecutor(MySQLCommandExecuteEngine.java:60)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:99)
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)
Caused by: org.antlr.v4.runtime.NoViableAltException: null
at
org.antlr.v4.runtime.atn.ParserATNSimulator.noViableAlt(ParserATNSimulator.java:2026)
at
org.antlr.v4.runtime.atn.ParserATNSimulator.execATN(ParserATNSimulator.java:467)
at
org.antlr.v4.runtime.atn.ParserATNSimulator.adaptivePredict(ParserATNSimulator.java:393)
at
org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.select(MySQLStatementParser.java:3594)
... 19 common frames omitted
</code>
</pre>
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