【flink】Chunk splitting has encountered exception

执行任务报错： Chunk splitting has encountered exception

错误信息截图：

完整的错误信息：

16:30:43,911 ERROR org.apache.flink.runtime.source.coordinator.SourceCoordinator [SourceCoordinator-Source: CDC Sourceorg.jobslink.flink.UserCDCJob]  - Uncaught exception in the SplitEnumerator for Source Source: CDC Sourceorg.flink.UserCDCJob while handling operator event RequestSplitEvent (host='') from subtask 0. Triggering job failover.
org.apache.flink.util.FlinkRuntimeException: Chunk splitting has encountered exception
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.checkSplitterErrors(MySqlSnapshotSplitAssigner.java:522)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.getNext(MySqlSnapshotSplitAssigner.java:278)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.getNext(MySqlSnapshotSplitAssigner.java:298)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlHybridSplitAssigner.getNext(MySqlHybridSplitAssigner.java:123)
    at com.ververica.cdc.connectors.mysql.source.enumerator.MySqlSourceEnumerator.assignSplits(MySqlSourceEnumerator.java:201)
    at com.ververica.cdc.connectors.mysql.source.enumerator.MySqlSourceEnumerator.handleSplitRequest(MySqlSourceEnumerator.java:117)
    at org.apache.flink.runtime.source.coordinator.SourceCoordinator.lambda$handleEventFromOperator$2(SourceCoordinator.java:230)
    at org.apache.flink.runtime.source.coordinator.SourceCoordinator.lambda$runInEventLoop$9(SourceCoordinator.java:406)
    at org.apache.flink.util.ThrowableCatchingRunnable.run(ThrowableCatchingRunnable.java:40)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
    at java.util.concurrent.FutureTask.run(FutureTask.java)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Error when splitting chunks for jobslink_user.jobslink_account
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.splitTable(MySqlSnapshotSplitAssigner.java:246)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.splitChunksForRemainingTables(MySqlSnapshotSplitAssigner.java:505)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
    at java.util.concurrent.FutureTask.run(FutureTask.java)
    ... 3 more
Caused by: java.lang.RuntimeException: Fail to analyze table in chunk splitter.
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlChunkSplitter.analyzeTable(MySqlChunkSplitter.java:154)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlChunkSplitter.splitChunks(MySqlChunkSplitter.java:117)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.splitTable(MySqlSnapshotSplitAssigner.java:244)
    ... 7 more
Caused by: org.apache.flink.table.api.ValidationException: Incremental snapshot for tables requires primary key, but table user.account doesn't have primary key.
    at com.ververica.cdc.connectors.mysql.source.utils.ChunkUtils.getChunkKeyColumn(ChunkUtils.java:55)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlChunkSplitter.analyzeTable(MySqlChunkSplitter.java:148)
    ... 9 more
16:30:43,929 INFO  org.apache.flink.runtime.jobmaster.JobMaster                 [flink-akka.actor.default-dispatcher-9]  - Trying to recover from a global failure.
org.apache.flink.util.FlinkException: Global failure triggered by OperatorCoordinator for 'Source: CDC Sourceorg.jobslink.flink.UserCDCJob -> Filter -> Flat Map -> Filter -> (Sink: Print to Std. Out, Sink: sink jobslink_account)' (operator cbc357ccb763df2852fee8c4fc7d55f2).
    at org.apache.flink.runtime.operators.coordination.OperatorCoordinatorHolder$LazyInitializedCoordinatorContext.failJob(OperatorCoordinatorHolder.java:556)
    at org.apache.flink.runtime.operators.coordination.RecreateOnResetOperatorCoordinator$QuiesceableContext.failJob(RecreateOnResetOperatorCoordinator.java:231)
    at org.apache.flink.runtime.source.coordinator.SourceCoordinatorContext.failJob(SourceCoordinatorContext.java:316)
    at org.apache.flink.runtime.source.coordinator.SourceCoordinator.lambda$runInEventLoop$9(SourceCoordinator.java:420)
    at org.apache.flink.util.ThrowableCatchingRunnable.run(ThrowableCatchingRunnable.java:40)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
    at java.util.concurrent.FutureTask.run(FutureTask.java)
    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)
Caused by: org.apache.flink.util.FlinkRuntimeException: Chunk splitting has encountered exception
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.checkSplitterErrors(MySqlSnapshotSplitAssigner.java:522)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.getNext(MySqlSnapshotSplitAssigner.java:278)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.getNext(MySqlSnapshotSplitAssigner.java:298)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlHybridSplitAssigner.getNext(MySqlHybridSplitAssigner.java:123)
    at com.ververica.cdc.connectors.mysql.source.enumerator.MySqlSourceEnumerator.assignSplits(MySqlSourceEnumerator.java:201)
    at com.ververica.cdc.connectors.mysql.source.enumerator.MySqlSourceEnumerator.handleSplitRequest(MySqlSourceEnumerator.java:117)
    at org.apache.flink.runtime.source.coordinator.SourceCoordinator.lambda$handleEventFromOperator$2(SourceCoordinator.java:230)
    at org.apache.flink.runtime.source.coordinator.SourceCoordinator.lambda$runInEventLoop$9(SourceCoordinator.java:406)
    ... 9 more
Caused by: java.lang.IllegalStateException: Error when splitting chunks for jobslink_user.jobslink_account
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.splitTable(MySqlSnapshotSplitAssigner.java:246)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.splitChunksForRemainingTables(MySqlSnapshotSplitAssigner.java:505)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
    at java.util.concurrent.FutureTask.run(FutureTask.java)
    ... 3 more
Caused by: java.lang.RuntimeException: Fail to analyze table in chunk splitter.
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlChunkSplitter.analyzeTable(MySqlChunkSplitter.java:154)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlChunkSplitter.splitChunks(MySqlChunkSplitter.java:117)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlSnapshotSplitAssigner.splitTable(MySqlSnapshotSplitAssigner.java:244)
    ... 7 more
Caused by: org.apache.flink.table.api.ValidationException: Incremental snapshot for tables requires primary key, but table user.account doesn't have primary key.
    at com.ververica.cdc.connectors.mysql.source.utils.ChunkUtils.getChunkKeyColumn(ChunkUtils.java:55)
    at com.ververica.cdc.connectors.mysql.source.assigners.MySqlChunkSplitter.analyzeTable(MySqlChunkSplitter.java:148)
    ... 9 more
16:30:43,933 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [flink-akka.actor.default-dispatcher-9]  - Job org.flink.UserCDCJob (35780b6f0490a368fc256b228e99f7cb) switched from state RUNNING to RESTARTING.
16:30:43,936 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [flink-akka.actor.default-dispatcher-9]  - Source: CDC Sourceorg.flink.UserCDCJob -> Filter -> Flat Map -> Filter -> (Sink: Print to Std. Out, Sink: sink account) (1/1) (45028a2ced14e3bbe2d7cf3349defba0) switched from RUNNING to CANCELING.

** Incremental snapshot for tables requires primary key, but table user.account doesn't have primary key.**

表的增量快照需要主键，但表user.account没有主键。

去user库account表增加主键

添加上主键以后就可以正常执行了！！！