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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12724) Let BufferedFSInputStream implement CanUnbuffer
Date Thu, 21 Jan 2016 00:32:40 GMT
Ted Yu created HADOOP-12724:
-------------------------------

             Summary: Let BufferedFSInputStream implement CanUnbuffer
                 Key: HADOOP-12724
                 URL: https://issues.apache.org/jira/browse/HADOOP-12724
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Ted Yu


When trying to determine reason for test failure over in HBASE-9393, I saw the following exception:
{code}
testSeekTo[4](org.apache.hadoop.hbase.io.hfile.TestSeekTo)  Time elapsed: 0.033 sec  <<<
ERROR!
java.lang.UnsupportedOperationException: this stream does not support unbuffering.
	at org.apache.hadoop.fs.FSDataInputStream.unbuffer(FSDataInputStream.java:229)
	at org.apache.hadoop.fs.FSDataInputStream.unbuffer(FSDataInputStream.java:227)
	at org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion(HFile.java:518)
	at org.apache.hadoop.hbase.io.hfile.HFile.createReader(HFile.java:562)
	at org.apache.hadoop.hbase.io.hfile.TestSeekTo.testSeekToInternals(TestSeekTo.java:307)
	at org.apache.hadoop.hbase.io.hfile.TestSeekTo.testSeekTo(TestSeekTo.java:298)
{code}
Here is the cause:
{code}
java.lang.ClassCastException: org.apache.hadoop.fs.BufferedFSInputStream cannot be cast to
org.apache.hadoop.fs.CanUnbuffer
{code}
See the comments starting with https://issues.apache.org/jira/browse/HBASE-9393?focusedCommentId=15105939&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15105939
for background on the HBase patch.

This issue is to make BufferedFSInputStream implement CanUnbuffer.

Thanks to [~cmccabe] for discussion.



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