steveloughran commented on a change in pull request #2646:
URL: https://github.com/apache/hadoop/pull/2646#discussion_r572175379
##########
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:
ok
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: common-issues-h...@hadoop.apache.org
