Github user trkurc commented on the pull request: https://github.com/apache/nifi/pull/192#issuecomment-177524368 Think I found an edge case - I believe I successfully aborted an upload, i.e., I had an upload half done, stopped the processor, flushed the queue, waited, then sent a different file through, which logged that it aborted the upload. I sent the same file through a while later and it failed with the following stack trace - ``` 2016-01-31 10:24:27,334 ERROR [Timer-Driven Process Thread-8] o.a.nifi.processors.aws.s3.PutS3Object com.amazonaws.services.s3.model.AmazonS3Exception: The specified upload does not exist. The upload ID may be invalid, or the upload may have been aborted or completed. (Service: Amazon S3; Status Code: 404; Error Code: NoSuchUpload; Request ID: 998A0D40DE65697F) at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:1219) ~[aws-java-sdk-core-1.10.32.jar:na] at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:803) ~[aws-java-sdk-core-1.10.32.jar:na] at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:505) ~[aws-java-sdk-core-1.10.32.jar:na] at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:317) ~[aws-java-sdk-core-1.10.32.jar:na] at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3595) ~[aws-java-sdk-s3-1.10.32.jar:na] at com.amazonaws.services.s3.AmazonS3Client.doUploadPart(AmazonS3Client.java:2733) ~[aws-java-sdk-s3-1.10.32.jar:na] at com.amazonaws.services.s3.AmazonS3Client.uploadPart(AmazonS3Client.java:2718) ~[aws-java-sdk-s3-1.10.32.jar:na] at org.apache.nifi.processors.aws.s3.PutS3Object$1.process(PutS3Object.java:506) ~[nifi-aws-processors-0.4.2-SNAPSHOT.jar:0.4.2-SNAPSHOT] at org.apache.nifi.controller.repository.StandardProcessSession.read(StandardProcessSession.java:1806) ~[na:na] at org.apache.nifi.controller.repository.StandardProcessSession.read(StandardProcessSession.java:1777) ~[na:na] at org.apache.nifi.processors.aws.s3.PutS3Object.onTrigger(PutS3Object.java:316) ~[nifi-aws-processors-0.4.2-SNAPSHOT.jar:0.4.2-SNAPSHOT] at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27) [nifi-api-0.4.2-SNAPSHOT.jar:0.4.2-SNAPSHOT] at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1139) [nifi-framework-core-0.4.2-SNAPSHOT.jar:0.4.2-SNAPSHOT] at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:139) [nifi-framework-core-0.4.2-SNAPSHOT.jar:0.4.2-SNAPSHOT] at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:49) [nifi-framework-core-0.4.2-SNAPSHOT.jar:0.4.2-SNAPSHOT] at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:119) [nifi-framework-core-0.4.2-SNAPSHOT.jar:0.4.2-SNAPSHOT] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_10] at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351) [na:1.7.0_10] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178) [na:1.7.0_10] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178) [na:1.7.0_10] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.7.0_10] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [na:1.7.0_10] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [na:1.7.0_10] at java.lang.Thread.run(Thread.java:722) [na:1.7.0_10] ```
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