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https://issues.apache.org/jira/browse/HADOOP-15928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16685787#comment-16685787
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Pranay Singh commented on HADOOP-15928:
---------------------------------------
[~ste...@apache.org] this problem is not particular to Impala it is seen every
time when a file is opened (via hdfsOpenFileImpl()) in a S3 environment there
is an error/exception logged (below) to STDERR, which is unwarranted. This
error is generated because hdfsOpenFileImpl() calls readDirect() to do a
buffered read, which is resulting in this exception.
Message dumped 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)
Writing test case will require access to S3 which will require AWS credentials,
I have done a manual test to verify the fix with my AWS keys (which cannot be
shared)
> Excessive error logging when using HDFS in S3 environment
> ---------------------------------------------------------
>
> 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 Impala uses HDFS in S3 environment,
> this issue is caused because of defect HADOOP-14603 "S3A input stream to
> support ByteBufferReadable"
> Excessive error logging results in defect IMPALA-5256: "ERROR log files can
> get very large". This causes the error log files to be huge.
> The following message is printed repeatedly in the error log:
> 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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