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https://issues.apache.org/jira/browse/HADOOP-15928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16685849#comment-16685849
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Steve Loughran commented on HADOOP-15928:
-----------------------------------------
OK, I understand now. changed the title
This is an hdfs issue; its their code. Can you move it to the HDFS project then
set the version & component fields.
bq. Writing test case will require access to S3 which will require AWS
credentials, I
all our hadoop-aws integration tests require user-supplied AWS credentials; all
patches which go near S3 need them.
In this case, i don't think you do neet to go to that effort: all we need is an
FS which doesn't implement ByteBufferReadable, just some dummy Fs like
{{org.apache.hadoop.fs.TestFileSystemCanonicalization.DummyFileSystem}}
> libhdfs logs errors when opened FS doesn't support ByteBufferReadable
> ---------------------------------------------------------------------
>
> Key: HADOOP-15928
> URL: https://issues.apache.org/jira/browse/HADOOP-15928
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Pranay Singh
> Assignee: Pranay Singh
> Priority: Major
> Attachments: HADOOP-15928.001.patch
>
>
> Problem:
> ------------
> There is excessive error logging when a file is opened by libhdfs
> (DFSClient/HDFS) in S3 environment, this issue is caused because buffered
> read is not supported in S3 environment, HADOOP-14603 "S3A input stream to
> support ByteBufferReadable"
> The following message is printed repeatedly in the error log/ to STDERR:
> --------------------------------------------------------------------------------------------------
> UnsupportedOperationException: Byte-buffer read unsupported by input
> streamjava.lang.UnsupportedOperationException: Byte-buffer read unsupported
> by input stream
> at
> org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:150)
> Root cause
> ----------------
> After investigating the issue, it appears that the above exception is printed
> because
> when a file is opened via hdfsOpenFileImpl() calls readDirect() which is
> hitting this
> exception.
> Fix:
> ----
> Since the hdfs client is not initiating the byte buffered read but is
> happening in a implicit manner, we should not be generating the error log
> during open of a file.
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