这不是flink问题吧。你代码遍历List时进行了remove操作，导致这个问题。解决方案是iterator遍历，并iterator.remove即可
在 2019/9/10 下午4:18，“王佩”<wang...@cmcm.com> 写入:
用Flink 写ES ConcurrentModificationException 遇到以下异常:
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Job kafka_to_es (ba125eebbe5d09c7d224c7f2a05143b8) switched from
state RUNNING to FAILING.
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
at
org.apache.flink.streaming.connectors.elasticsearch.BufferingNoOpRequestIndexer.processBufferedRequests(BufferingNoOpRequestIndexer.java:64)
at
org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkBase.checkAsyncErrorsAndRequests(ElasticsearchSinkBase.java:387)
at
org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkBase.invoke(ElasticsearchSinkBase.java:307)
at
org.apache.flink.streaming.api.operators.StreamSink.processElement(StreamSink.java:56)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at
org.apache.flink.streaming.api.operators.StreamFilter.processElement(StreamFilter.java:40)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at
org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at
org.apache.flink.streaming.api.operators.StreamFilter.processElement(StreamFilter.java:40)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at
org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41)
at
org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:202)
at
org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:105)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
at java.lang.Thread.run(Thread.java:745)
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (1/7) (4ac0c0f04e782a8c0f6d102b2e524860)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (2/7) (1d4b9af5ec8602a1930bd3adaf593c6a)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (3/7) (008557eedfe304b378eb9403646d2926)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (4/7) (373e5417ba6514af74c874a9526bc8e2)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (5/7) (d506cbef09c1ab7441543d03f43875ff)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (6/7) (a84920b7c44801585ba970de08c09973)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (7/7) (1eb82cf791c608a4b3d8f8e15aaf6948)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (1/8) (2c3af5806021a731a36ee7f215237aba)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (2/8) (f483a8fc1d22381345545b1e2a6af71b)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (3/8) (3fd4f4b9955666adfb58e9243f4f84ed)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (4/8) (5b049f52e2742557603683889c348e9d)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (6/8) (67d3f14fdca5ef94caad1c7a2d866416)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (7/8) (db6ca246830a34c359d5ce732cc9ea79)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (8/8) (097ceb890ce879e3c804772cbe0892dd)
switched from RUNNING to CANCELING.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (6/8) (67d3f14fdca5ef94caad1c7a2d866416)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (4/7) (373e5417ba6514af74c874a9526bc8e2)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (7/7) (1eb82cf791c608a4b3d8f8e15aaf6948)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (1/7) (4ac0c0f04e782a8c0f6d102b2e524860)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (5/7) (d506cbef09c1ab7441543d03f43875ff)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (2/7) (1d4b9af5ec8602a1930bd3adaf593c6a)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (6/7) (a84920b7c44801585ba970de08c09973)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 Source: KafkaSource (3/7) (008557eedfe304b378eb9403646d2926)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (3/8) (3fd4f4b9955666adfb58e9243f4f84ed)
switched from CANCELING to CANCELED.
2019-09-10 08:13:14 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph transitionState
1417 ToJSON -> FilterNull -> ExtExtractor(Plugin) -> FilterNull ->
Sink: ElasticsearchSink (4/8) (5b049f52e2742557603683889c348e9d)
switched from CANCELING to CANCELED.
帮忙看下，是不是Flink 内部的问题。
