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_r341441861
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File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.java
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@@ -270,22 +271,18 @@ 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;
+ if (CanUnbuffer.class.isAssignableFrom(streamClass)) {
Review comment:
@Apache9 Good question! Because here we cast the sub class to parent
class/interface, generally if want to check the up cast, we use
`isAssignableFrom`. Also here the logic we want to judge the Class inheritance
relationship, NOT the instance. Through use `(wrappedStream instanceof
CanUnbuffer)` should get the same results, but I prefer `isAssignableFrom`.
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