[
https://issues.apache.org/jira/browse/HADOOP-16109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16783541#comment-16783541
]
Steve Loughran commented on HADOOP-16109:
-----------------------------------------
latest PR update adds the tests & makes sure that each parameterized run is
switching seek policies
> Parquet reading S3AFileSystem causes EOF
> ----------------------------------------
>
> Key: HADOOP-16109
> URL: https://issues.apache.org/jira/browse/HADOOP-16109
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 2.9.2, 2.8.5, 3.3.0, 3.1.2
> Reporter: Dave Christianson
> Assignee: Steve Loughran
> Priority: Blocker
>
> When using S3AFileSystem to read Parquet files a specific set of
> circumstances causes an EOFException that is not thrown when reading the
> same file from local disk
> Note this has only been observed under specific circumstances:
> - when the reader is doing a projection (will cause it to do a seek
> backwards and put the filesystem into random mode)
> - when the file is larger than the readahead buffer size
> - when the seek behavior of the Parquet reader causes the reader to seek
> towards the end of the current input stream without reopening, such that the
> next read on the currently open stream will read past the end of the
> currently open stream.
> Exception from Parquet reader is as follows:
> {code}
> Caused by: java.io.EOFException: Reached the end of stream with 51 bytes left
> to read
> at
> org.apache.parquet.io.DelegatingSeekableInputStream.readFully(DelegatingSeekableInputStream.java:104)
> at
> org.apache.parquet.io.DelegatingSeekableInputStream.readFullyHeapBuffer(DelegatingSeekableInputStream.java:127)
> at
> org.apache.parquet.io.DelegatingSeekableInputStream.readFully(DelegatingSeekableInputStream.java:91)
> at
> org.apache.parquet.hadoop.ParquetFileReader$ConsecutiveChunkList.readAll(ParquetFileReader.java:1174)
> at
> org.apache.parquet.hadoop.ParquetFileReader.readNextRowGroup(ParquetFileReader.java:805)
> at
> org.apache.parquet.hadoop.InternalParquetRecordReader.checkRead(InternalParquetRecordReader.java:127)
> at
> org.apache.parquet.hadoop.InternalParquetRecordReader.nextKeyValue(InternalParquetRecordReader.java:222)
> at
> org.apache.parquet.hadoop.ParquetRecordReader.nextKeyValue(ParquetRecordReader.java:207)
> at
> org.apache.flink.api.java.hadoop.mapreduce.HadoopInputFormatBase.fetchNext(HadoopInputFormatBase.java:206)
> at
> org.apache.flink.api.java.hadoop.mapreduce.HadoopInputFormatBase.reachedEnd(HadoopInputFormatBase.java:199)
> at
> org.apache.flink.runtime.operators.DataSourceTask.invoke(DataSourceTask.java:190)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> The following example program generate the same root behavior (sans finding a
> Parquet file that happens to trigger this condition) by purposely reading
> past the already active readahead range on any file >= 1029 bytes in size..
> {code:java}
> final Configuration conf = new Configuration();
> conf.set("fs.s3a.readahead.range", "1K");
> conf.set("fs.s3a.experimental.input.fadvise", "random");
> final FileSystem fs = FileSystem.get(path.toUri(), conf);
> // forward seek reading across readahead boundary
> try (FSDataInputStream in = fs.open(path)) {
> final byte[] temp = new byte[5];
> in.readByte();
> in.readFully(1023, temp); // <-- works
> }
> // forward seek reading from end of readahead boundary
> try (FSDataInputStream in = fs.open(path)) {
> final byte[] temp = new byte[5];
> in.readByte();
> in.readFully(1024, temp); // <-- throws EOFException
> }
> {code}
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: common-issues-h...@hadoop.apache.org
