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https://issues.apache.org/jira/browse/HADOOP-18184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17746939#comment-17746939
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ASF GitHub Bot commented on HADOOP-18184:
-----------------------------------------
steveloughran commented on code in PR #5832:
URL: https://github.com/apache/hadoop/pull/5832#discussion_r1273419854
##########
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/prefetch/S3ARemoteInputStream.java:
##########
@@ -409,27 +455,54 @@ protected String getOffsetStr(long offset) {
return String.format("%d:%d", blockNumber, offset);
}
+ @Override
+ public synchronized void unbuffer() {
+ LOG.debug("{}: unbuffered", getName());
+ if (closeStream(true)) {
+ getS3AStreamStatistics().unbuffered();
+ }
+ }
+
+ /**
+ * Close the stream in close() or unbuffer().
+ * @param unbuffer is this an unbuffer operation?
+ * @return true if the stream was closed; false means it was already closed.
+ */
+ protected boolean closeStream(final boolean unbuffer) {
+
+ if (underlyingResourcesClosed.getAndSet(true)) {
+ return false;
+ }
+
+ if (unbuffer) {
Review Comment:
done
> s3a prefetching stream to support unbuffer()
> --------------------------------------------
>
> Key: HADOOP-18184
> URL: https://issues.apache.org/jira/browse/HADOOP-18184
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.4.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Labels: pull-request-available
>
> Apache Impala uses unbuffer() to free up all client side resources held by a
> stream, so allowing it to have a map of available (path -> stream) objects,
> retained across queries.
> This saves on having to reopen the files, with the cost of HEAD checks etc.
> S3AInputStream just closes its http connection. here there is a lot more
> state to discard, but all memory and file storage must be freed.
> until this done, ITestS3AContractUnbuffer must skip when the prefetch stream
> is used.
> its notable that the other tests don't fail, even though the stream doesn't
> implement the interface; the graceful degradation handles that. it should
> fail if the test xml resource says the stream does it, but that the stream
> capabilities say it doesn't.
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