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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