[jira] [Created] (HADOOP-15928) Excessive error logging when using HDFS in S3 environment

["Pranay Singh (JIRA)" <ji...@apache.org>]

Pranay Singh created HADOOP-15928:
-------------------------------------

             Summary: 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


Problem:
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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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