我有一个Elastic MapReduce作业，它通过elasticsearch-hadoop使用scalding-taps将数据从Amazon S3传输到Amazon Elasticsearch Service。很长一段时间，这份工作顺利完成。但是，它最近开始使用以下堆栈跟踪失败：
2016-03-02 07:28:34,003 FATAL [IPC Server handler 0 on 41019] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Task: attempt_1456902751849_0012_m_000000_0 - exited : cascading.tuple.TupleException: unable to sink into output identifier: myindex/mytable
at cascading.tuple.TupleEntrySchemeCollector.collect(TupleEntrySchemeCollector.java:160)
at cascading.tuple.TupleEntryCollector.safeCollect(TupleEntryCollector.java:145)
at cascading.tuple.TupleEntryCollector.add(TupleEntryCollector.java:95)
at cascading.tuple.TupleEntrySchemeCollector.add(TupleEntrySchemeCollector.java:134)
at cascading.flow.stream.SinkStage.receive(SinkStage.java:90)
at cascading.flow.stream.SinkStage.receive(SinkStage.java
:37)
at cascading.flow.stream.FunctionEachStage$1.collect(FunctionEachStage.java:80)
at cascading.tuple.TupleEntryCollector.safeCollect(TupleEntryCollector.java:145)
at cascading.tuple.TupleEntryCollector.add(TupleEntryCollector.java:133)
at com.twitter.scalding.MapFunction.operate(Operations.scala:59)
at cascading.flow.stream.FunctionEachStage.receive(FunctionEachStage.java:99)
at cascading.flow.stream.FunctionEachStage.receive(FunctionEachStage.java:39)
at cascading.flow.stream.SourceStage.map(SourceStage.java:102)
at cascading.flow.stream.SourceStage.run(SourceStage.java:58)
at cascading.flow.hadoop.FlowMapper.run(FlowMapper.java:130)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:432)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:175)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:170)
Caused by: org.elasticsearch.hadoop.rest.EsHadoopInvalidRequest: null
我们启用了“es.nodes.wan.only”设置。
导致这种失败的原因是什么？