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_r345005990
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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:
@joshelser Which syntax you suggest, the `instanceof` or
`isAssignableFrom`? The `instanceof` can be used to judge both class and
interface instance, I think generally we used to judge the class instance, so
here I prefer `isAssignableFrom`. Anymore question please feel free point out.
Thanks!
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