anoopsjohn commented on a change in pull request #2646:
URL: https://github.com/apache/hadoop/pull/2646#discussion_r570700786
##########
File path:
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsInputStream.java
##########
@@ -135,6 +145,41 @@ public String getPath() {
return path;
}
+ @Override
+ public int read(long position, byte[] buffer, int offset, int length)
+ throws IOException {
+ // When bufferedPreadDisabled = true, this API do not use any shared
buffer,
+ // cursor position etc. So this is implemented as NOT synchronized. HBase
+ // kind of random reads on a shared file input stream will greatly get
+ // benefited by such implementation.
+ // Strict close check at the begin of the API only not for the entire flow.
+ synchronized (this) {
+ if (closed) {
+ throw new IOException(FSExceptionMessages.STREAM_IS_CLOSED);
+ }
+ }
+ LOG.debug("pread requested offset = {} len = {} bufferedPreadDisabled =
{}",
+ offset, length, bufferedPreadDisabled);
+ if (!bufferedPreadDisabled) {
+ return super.read(position, buffer, offset, length);
+ }
+ validatePositionedReadArgs(position, buffer, offset, length);
+ if (length == 0) {
+ return 0;
+ }
+ if (streamStatistics != null) {
+ streamStatistics.readOperationStarted();
+ }
+ int bytesRead = readRemote(position, buffer, offset, length);
Review comment:
Will have to do as a follow up issue then. Sounds ok? Will raise one
and link to this issue.
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