dark-spark2 opened a new issue #9467: Ingestion fails on 'Connection reset by 
peer' when using native parallel ingestion
URL: https://github.com/apache/druid/issues/9467
 
 
   
   ### Affected Version
   druid 0.17
   ### Description
   When running native ingestion with "index_parallel" on druid 0.17. 
   I receive the following error:
   `java.io.IOException: java.lang.RuntimeException: 
java.util.concurrent.ExecutionException: java.io.IOException: Connection reset 
by peer 
   at org.apache.druid.java.util.common.FileUtils.copyLarge(FileUtils.java:311) 
~[druid-core-0.17.0.jar:0.17.0]
        at 
org.apache.druid.indexing.common.task.batch.parallel.PartialSegmentMergeTask.fetchSegmentFile(PartialSegmentMergeTask.java:261)
 ~[druid-indexing-service-0.17.0.jar:0.17.0]
        at 
org.apache.druid.indexing.common.task.batch.parallel.PartialSegmentMergeTask.fetchSegmentFiles(PartialSegmentMergeTask.java:236)
 ~[druid-indexing-service-0.17.0.jar:0.17.0]
        at 
org.apache.druid.indexing.common.task.batch.parallel.PartialSegmentMergeTask.runTask(PartialSegmentMergeTask.java:178)
 ~[druid-indexing-service-0.17.0.jar:0.17.0]
        at 
org.apache.druid.indexing.common.task.batch.parallel.PartialGenericSegmentMergeTask.runTask(PartialGenericSegmentMergeTask.java:44)
 ~[druid-indexing-service-0.17.0.jar:0.17.0]
        at 
org.apache.druid.indexing.common.task.AbstractBatchIndexTask.run(AbstractBatchIndexTask.java:138)
 ~[druid-indexing-service-0.17.0.jar:0.17.0]
        at 
org.apache.druid.indexing.overlord.SingleTaskBackgroundRunner$SingleTaskBackgroundRunnerCallable.call(SingleTaskBackgroundRunner.java:419)
 [druid-indexing-service-0.17.0.jar:0.17.0]
        at 
org.apache.druid.indexing.overlord.SingleTaskBackgroundRunner$SingleTaskBackgroundRunnerCallable.call(SingleTaskBackgroundRunner.java:391)
 [druid-indexing-service-0.17.0.jar:0.17.0]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
[?:1.8.0_232]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
[?:1.8.0_232]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
[?:1.8.0_232]`
   
   I am sending the following task to overlord:
   `{
     "type" : "index_parallel",
     "spec" : {
       "ioConfig" : {
         "type": "index_parallel",
         "inputSource": {
           "type": "s3",
           "prefixes": ["s3://filePAth"]
         },
         "inputFormat": {
           "type": "json"
         }
       },
       "dataSchema" : {
         "dataSource" : "test_batch",
         "granularitySpec" : {
           "type" : "uniform",
           "segmentGranularity" : "HOUR",
           "queryGranularity" : "HOUR",
           "intervals" : ["2018-10-06/2018-10-07"]
         },
         "dimensionsSpec" : {
           "dimensions" : [
             "filed1","field2","field3"
           ]
           },
           "timestampSpec" : {
               "format" : "auto",
               "column" : "timestamp"
           },
       },
       "tuningConfig" : {
         "type": "index_parallel",
         "maxNumConcurrentSubTasks": 2,
         "partitionsSpec" : {
          "type": "single_dim",
          "targetRowsPerSegment": 100000,
          "partitionDimension": "field1"
         }
       }
     }
   }
   
   `
   The strange thing is that when removing the "partitionSpec" everything works 
well.
   Thanks.

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