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From spoganshev <s.pogans...@slice.com>
Subject S3A "Data read has a different length than the expected" issue root cause
Date Tue, 17 Dec 2019 12:36:53 GMT
In case you experience an exception similar to the following:

org.apache.flink.fs.s3base.shaded.com.amazonaws.SdkClientException: Data
read has a different length than the expected: dataLength=53562;
expectedLength=65536; includeSkipped=true; in.getClass()=class
org.apache.flink.fs.s3base.shaded.com.amazonaws.services.s3.AmazonS3Client$2;
markedSupported=false; marked=0; resetSinceLastMarked=false; markCount=0;
resetCount=0
        at
org.apache.flink.fs.s3base.shaded.com.amazonaws.util.LengthCheckInputStream.checkLength(LengthCheckInputStream.java:151)
        at
org.apache.flink.fs.s3base.shaded.com.amazonaws.util.LengthCheckInputStream.read(LengthCheckInputStream.java:93)
        at
org.apache.flink.fs.s3base.shaded.com.amazonaws.internal.SdkFilterInputStream.read(SdkFilterInputStream.java:76)
        at
org.apache.flink.fs.shaded.hadoop3.org.apache.hadoop.fs.s3a.S3AInputStream.closeStream(S3AInputStream.java:529)
        at
org.apache.flink.fs.shaded.hadoop3.org.apache.hadoop.fs.s3a.S3AInputStream.close(S3AInputStream.java:490)
        at java.io.FilterInputStream.close(FilterInputStream.java:181)
        at
org.apache.flink.fs.s3.common.hadoop.HadoopDataInputStream.close(HadoopDataInputStream.java:89)
        at
org.apache.flink.api.common.io.FileInputFormat.close(FileInputFormat.java:861)
        at
org.apache.flink.runtime.operators.DataSourceTask.invoke(DataSourceTask.java:206)
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:705)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
        at java.lang.Thread.run(Thread.java:748)


The root cause is a bug in Hadoop's S3A filesystem implementation:
https://issues.apache.org/jira/browse/HADOOP-16767

A temporary hacky workaround is to replace S3AInputStream class and all the
classes that it requires and use it in a custom filesystem implementation.



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