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:
------------
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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