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From "Binglin Chang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5574) Remove buffer copy in BlockReader.skip
Date Tue, 28 Apr 2015 12:21:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516940#comment-14516940
] 

Binglin Chang commented on HDFS-5574:
-------------------------------------

Strange, the test error is caused by NoSuchMethodError, which should not happen if code is
compiled successfully, is there any bug in test-patch process?

{code}
java.lang.NoSuchMethodError: org.apache.hadoop.fs.FSInputChecker.readAndDiscard(I)I
	at org.apache.hadoop.hdfs.RemoteBlockReader.read(RemoteBlockReader.java:128)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:740)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:796)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:856)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:899)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:700)
	at org.apache.hadoop.hdfs.TestDFSInputStream.testSkipInner(TestDFSInputStream.java:61)
	at org.apache.hadoop.hdfs.TestDFSInputStream.testSkipWithRemoteBlockReader(TestDFSInputStream.java:76)
{code}

> Remove buffer copy in BlockReader.skip
> --------------------------------------
>
>                 Key: HDFS-5574
>                 URL: https://issues.apache.org/jira/browse/HDFS-5574
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Binglin Chang
>            Assignee: Binglin Chang
>            Priority: Trivial
>         Attachments: HDFS-5574.006.patch, HDFS-5574.007.patch, HDFS-5574.008.patch, HDFS-5574.v1.patch,
HDFS-5574.v2.patch, HDFS-5574.v3.patch, HDFS-5574.v4.patch, HDFS-5574.v5.patch
>
>
> BlockReaderLocal.skip and RemoteBlockReader.skip uses a temp buffer to read data to this
buffer, it is not necessary. 



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