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https://issues.apache.org/jira/browse/HADOOP-14872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16246199#comment-16246199
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John Zhuge commented on HADOOP-14872:
-------------------------------------
Ran "test-patch" locally and got all +1s except these expected javac
deprecation warnings. Committing.
{noformat}
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java:[42,46]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java:[251,30]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java:[252,33]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedOutputStream.java:[32,46]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSOutputStream.java:[40,46]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedOutputStream.java:[201,16]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedOutputStream.java:[204,16]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSOutputStream.java:[362,25]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
[WARNING]
/home/jzhuge/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSOutputStream.java:[364,25]
[deprecation] StreamCapability in StreamCapabilities has been deprecated
{noformat}
> CryptoInputStream should implement unbuffer
> -------------------------------------------
>
> Key: HADOOP-14872
> URL: https://issues.apache.org/jira/browse/HADOOP-14872
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs, security
> Affects Versions: 2.6.4
> Reporter: John Zhuge
> Assignee: John Zhuge
> Attachments: HADOOP-14872.001.patch, HADOOP-14872.002.patch,
> HADOOP-14872.003.patch, HADOOP-14872.004.patch, HADOOP-14872.005.patch,
> HADOOP-14872.006.patch, HADOOP-14872.007.patch, HADOOP-14872.008.patch,
> HADOOP-14872.009.patch, HADOOP-14872.010.patch, HADOOP-14872.011.patch,
> HADOOP-14872.012.patch, HADOOP-14872.013.patch
>
>
> Discovered in IMPALA-5909.
> Opening an encrypted HDFS file returns a chain of wrapped input streams:
> {noformat}
> HdfsDataInputStream
> CryptoInputStream
> DFSInputStream
> {noformat}
> If an application such as Impala or HBase calls HdfsDataInputStream#unbuffer,
> FSDataInputStream#unbuffer will be called:
> {code:java}
> try {
> ((CanUnbuffer)in).unbuffer();
> } catch (ClassCastException e) {
> throw new UnsupportedOperationException("this stream does not " +
> "support unbuffering.");
> }
> {code}
> If the {{in}} class does not implement CanUnbuffer, UOE will be thrown. If
> the application is not careful, tons of UOEs will show up in logs.
> In comparison, opening an non-encrypted HDFS file returns this chain:
> {noformat}
> HdfsDataInputStream
> DFSInputStream
> {noformat}
> DFSInputStream implements CanUnbuffer.
> It is good for CryptoInputStream to implement CanUnbuffer for 2 reasons:
> * Release buffer, cache, or any other resource when instructed
> * Able to call its wrapped DFSInputStream unbuffer
> * Avoid the UOE described above. Applications may not handle the UOE very
> well.
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