一、報錯：
com.alibaba.otter.canal.protocol.exception.CanalClientException: something goes wrong with reason: something goes wrong with channel:[id: 0x184cf2a7, /172.31.23.66:49436 => /172.31.23.66:11111], exception=com.alibaba.otter.canal.meta.exception.CanalMetaManagerException: batchId:355 is not the firstly:250
at com.alibaba.otter.canal.client.impl.SimpleCanalConnector.receiveMessages(SimpleCanalConnector.java:245)
at com.alibaba.otter.canal.client.impl.SimpleCanalConnector.getWithoutAck(SimpleCanalConnector.java:222)
at com.alibaba.otter.canal.client.impl.SimpleCanalConnector.getWithoutAck(SimpleCanalConnector.java:207)
at com.chameleon.web.canal.PlayerBinlogMonitor.scheduleSyncData(PlayerBinlogMonitor.java:66)
at sun.reflect.GeneratedMethodAccessor127.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
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)問題：正確的batchID沒有ack應答，canal會再次消費數據。
解決方法：1.刪除 conf/example/mete.data