zhaoyim commented on a change in pull request #746: HBASE-23195
FSDataInputStreamWrapper unbuffer can NOT invoke the clas…
URL: https://github.com/apache/hbase/pull/746#discussion_r346644880
##########
File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.java
##########
@@ -270,39 +269,23 @@ public void unbuffer() {
if (this.instanceOfCanUnbuffer == null) {
// To ensure we compute whether the stream is instance of CanUnbuffer
only once.
this.instanceOfCanUnbuffer = false;
- Class<?>[] streamInterfaces = streamClass.getInterfaces();
- for (Class c : streamInterfaces) {
- if
(c.getCanonicalName().toString().equals("org.apache.hadoop.fs.CanUnbuffer")) {
- try {
- this.unbuffer = streamClass.getDeclaredMethod("unbuffer");
- } catch (NoSuchMethodException | SecurityException e) {
- if (isLogTraceEnabled) {
- LOG.trace("Failed to find 'unbuffer' method in class " +
streamClass
- + " . So there may be a TCP socket connection "
- + "left open in CLOSE_WAIT state.", e);
- }
- return;
- }
- this.instanceOfCanUnbuffer = true;
- break;
- }
+ if (CanUnbuffer.class.isAssignableFrom(streamClass)) {
+ this.unbuffer = (CanUnbuffer) wrappedStream;
+ this.instanceOfCanUnbuffer = true;
}
}
if (this.instanceOfCanUnbuffer) {
try {
- this.unbuffer.invoke(wrappedStream);
- } catch (IllegalAccessException | IllegalArgumentException |
InvocationTargetException e) {
+ this.unbuffer.unbuffer();
+ } catch (UnsupportedOperationException e){
Review comment:
For the Hadoop-common 2.X project org.apache.hadoop.fs.FSDataInputStream has
`
public void unbuffer()
{
try {
((CanUnbuffer) this.in).unbuffer();
} catch (ClassCastException e) {
throw new UnsupportedOperationException(
"this stream " +
this.in.getClass().getName() + " does not " + "support unbuffering.");
}
}
`
For the hadoop trunk branch in hadoop-common project
org.apache.hadoop.fs.StreamCapabilitiesPolicy throw
`
} catch (ClassCastException e) {
throw new UnsupportedOperationException(in.getClass().getName() + ": "
+ CAN_UNBUFFER_NOT_IMPLEMENTED_MESSAGE);
}
`
If I am wrong, please fell free correct me. Thanks!
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