Flink常见异常&解决办法

Flink启动报错

Caused by: java.lang.NoSuchMethodError: org.apache.flink.api.common.functions.RuntimeContext.getMetricGroup()Lorg/apache/flink/metrics/groups/OperatorMetricGroup;
	...
	at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:34) ~[flink-dist_2.11-1.13.2.jar:1.13.2]
	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102) ~[flink-dist_2.11-1.13.2.jar:1.13.2]
	at org.apache.flink.streaming.api.operators.ProcessOperator.open(ProcessOperator.java:56) ~[flink-dist_2.11-1.13.2.jar:1.13.2]
	...

Flink版本问题，从1.13.2升级到1.14.6，问题解决~

使用Flink-mysql-cdc启动报错

WARN  org.apache.flink.runtime.taskmanager.Task                    [] - Source: binlog_cdc_input -> input_count_function -> assign_timestamp_watermark -> delete_no_support_kind -> filter_row_column (3/10)#0 (88e9b7b3cd854aec006ec88441da84f2) switched from INITIALIZING to FAILED with failure cause: java.lang.IllegalArgumentException: Subtask ID 2 is out of server id range 1, please adjust the server id range to make the number of server id larger than the source parallelism.
	at com.ververica.cdc.connectors.mysql.source.config.ServerIdRange.getServerId(ServerIdRange.java:56)
	at com.ververica.cdc.connectors.mysql.source.config.MySqlSourceConfigFactory.createConfig(MySqlSourceConfigFactory.java:326)
	at com.ververica.cdc.connectors.mysql.source.config.MySqlSourceConfigFactory.createConfig(MySqlSourceConfigFactory.java:288)
	at com.ververica.cdc.connectors.mysql.source.MySqlSource.createReader(MySqlSource.java:135)
	at org.apache.flink.streaming.api.operators.SourceOperator.initReader(SourceOperator.java:268)
	at org.apache.flink.streaming.runtime.tasks.SourceOperatorStreamTask.init(SourceOperatorStreamTask.java:70)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreInternal(StreamTask.java:674)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.restore(StreamTask.java:651)
	at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:958)
	at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:927)
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:766)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:575)
	at java.lang.Thread.run(Thread.java:750)

是因为给cdc设置的serverId范围过小，导致多个并行度没有足够的serverId分配，导致启动失败！