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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12724) Let BufferedFSInputStream implement CanUnbuffer
Date Tue, 25 Oct 2016 15:55:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HADOOP-12724:
----------------------------
    Priority: Minor  (was: Major)

> 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
>            Priority: Minor
>
> 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.
> This would benefit hbase unit tests.
> Thanks to [~cmccabe] for discussion.



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