bilaharith commented on a change in pull request #2464:
URL: https://github.com/apache/hadoop/pull/2464#discussion_r526588250
##########
File path:
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsInputStream.java
##########
@@ -162,14 +172,86 @@ private int readOneBlock(final byte[] b, final int off,
final int len) throws IO
throw new IndexOutOfBoundsException();
}
- //If buffer is empty, then fill the buffer.
- if (bCursor == limit) {
+ if (firstRead && this.readSmallFilesCompletely
+ && contentLength <= bufferSize) { // Read small files completely
+ if (readFileCompletely() == -1) {
+ return -1;
+ }
+ } else if (firstRead && this.optimizeFooterRead && fCursor
+ == contentLength - FOOTER_DELTA) { // Read the last one block if the
+ // read is for the footer
+ if (readLastBlock() == -1) {
+ return -1;
+ }
+ } else {
+ if (readOneBlock(b) == -1) {
+ return -1;
+ }
+ }
+ fCursorAfterLastRead = fCursor;
+
+ //If there is anything in the buffer, then return lesser of (requested
bytes) and (bytes in buffer)
+ //(bytes returned may be less than requested)
+ int bytesRemaining = limit - bCursor;
+ int bytesToRead = Math.min(len, bytesRemaining);
+ System.arraycopy(buffer, bCursor, b, off, bytesToRead);
+ bCursor += bytesToRead;
+ if (statistics != null) {
+ statistics.incrementBytesRead(bytesToRead);
+ }
+ if (streamStatistics != null) {
+ // Bytes read from the local buffer.
+ streamStatistics.bytesReadFromBuffer(bytesToRead);
+ streamStatistics.bytesRead(bytesToRead);
+ }
+ return bytesToRead;
+ }
+
+ private long readFileCompletely() throws IOException {
+ bCursor = (int) getPos();
Review comment:
Done
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