运行一段时间，server线程挂起，报错如下，请问如何解决
ERROR c.a.o.canal.parse.inbound.mysql.tsdb.DatabaseTableMeta - scheudle applySnapshotToDB faield com.alibaba.otter.canal.parse.exception.CanalParseException: java.io.IOException: should execute connector.connect() first Caused by: java.io.IOException: should execute connector.connect() first at com.alibaba.otter.canal.parse.driver.mysql.MysqlQueryExecutor.(MysqlQueryExecutor.java:30) ~[canal.parse.driver-1.0.25.jar:na] at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.query(MysqlConnection.java:87) ~[canal.parse-1.0.25.jar:na] at com.alibaba.otter.canal.parse.inbound.mysql.tsdb.DatabaseTableMeta.compareTableMetaDbAndMemory(DatabaseTableMeta.java:294) ~[canal.parse-1.0.25.jar:na] at com.alibaba.otter.canal.parse.inbound.mysql.tsdb.DatabaseTableMeta.applySnapshotToDB(DatabaseTableMeta.java:251) ~[canal.parse-1.0.25.jar:na] at com.alibaba.otter.canal.parse.inbound.mysql.tsdb.DatabaseTableMeta.access$100(DatabaseTableMeta.java:45) ~[canal.parse-1.0.25.jar:na] at com.alibaba.otter.canal.parse.inbound.mysql.tsdb.DatabaseTableMeta$2.run(DatabaseTableMeta.java:84) ~[canal.parse-1.0.25.jar:na] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_144] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_144] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_144] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [na:1.8.0_144] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144]
原提问者GitHub用户zl4140035
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