saxenapranav commented on code in PR #6699:
URL: https://github.com/apache/hadoop/pull/6699#discussion_r1579170762
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hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsInputStream.java:
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@@ -376,32 +439,48 @@ private int readLastBlock(final byte[] b, final int off,
final int len)
// data need to be copied to user buffer from index bCursor,
// AbfsInutStream buffer is going to contain data from last block start. In
// that case bCursor will be set to fCursor - lastBlockStart
- long lastBlockStart = max(0, contentLength - footerReadSize);
+ if (!fileStatusInformationPresent.get()) {
+ long lastBlockStart = max(0, (fCursor + len) - footerReadSize);
+ bCursor = (int) (fCursor - lastBlockStart);
+ return optimisedRead(b, off, len, lastBlockStart, min(fCursor + len,
footerReadSize), true);
+ }
+ long lastBlockStart = max(0, getContentLength() - footerReadSize);
bCursor = (int) (fCursor - lastBlockStart);
// 0 if contentlength is < buffersize
- long actualLenToRead = min(footerReadSize, contentLength);
- return optimisedRead(b, off, len, lastBlockStart, actualLenToRead);
+ long actualLenToRead = min(footerReadSize, getContentLength());
+ return optimisedRead(b, off, len, lastBlockStart, actualLenToRead, false);
}
private int optimisedRead(final byte[] b, final int off, final int len,
- final long readFrom, final long actualLen) throws IOException {
+ final long readFrom, final long actualLen,
+ final boolean isReadWithoutContentLengthInformation) throws IOException {
fCursor = readFrom;
int totalBytesRead = 0;
int lastBytesRead = 0;
try {
buffer = new byte[bufferSize];
+ boolean fileStatusInformationPresentBeforeRead =
fileStatusInformationPresent.get();
for (int i = 0;
- i < MAX_OPTIMIZED_READ_ATTEMPTS && fCursor < contentLength; i++) {
+ i < MAX_OPTIMIZED_READ_ATTEMPTS &&
(!fileStatusInformationPresent.get()
+ || fCursor < getContentLength()); i++) {
lastBytesRead = readInternal(fCursor, buffer, limit,
(int) actualLen - limit, true);
if (lastBytesRead > 0) {
totalBytesRead += lastBytesRead;
+ boolean shouldBreak = !fileStatusInformationPresentBeforeRead
+ && totalBytesRead == (int) actualLen;
limit += lastBytesRead;
fCursor += lastBytesRead;
fCursorAfterLastRead = fCursor;
+ if (shouldBreak) {
+ break;
+ }
}
}
} catch (IOException e) {
+ if (isNonRetriableOptimizedReadException(e)) {
+ throw e;
Review Comment:
So, this is the case where there is lazy optimization , and inputStream is
not aware of contentlength. Now, on the first read, it could go into an
optimized block, and would try to read. In a non-lazy case, in trunk, if there
is IOException raised in optimizeRead, it tries to read with ReadOneBlock. Now,
in non-lazy case, it cannot be a case that an inputStream gets created for
non-existing path. But, in a lazy case, inputStream can be created for
non-existing path, and optimizeRead can be tried for it. Now, when the
optimizeRead is failing with FileNotFound, the inputStream should fail and not
try readOneBlock.
I should add a comment for better code understanding in future.
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