szetszwo commented on code in PR #11245:
URL: https://github.com/apache/ozone/pull/11245#discussion_r4065326381
##########
hadoop-ozone/ozonefs-common/src/main/java/org/apache/hadoop/fs/ozone/OzoneFSInputStream.java:
##########
@@ -211,4 +225,101 @@ public void readFully(long position, ByteBuffer buf)
throws IOException {
}
}
}
+
+ /**
+ * Byte-array positioned read. Tries the native stateless {@link
ExtendedInputStream#readFully}
+ * path first (via a zero-copy {@link ByteBuffer#wrap}). Falls back to a
synchronized
+ * seek-read-restore using byte-array {@link #read(byte[], int, int)} so
that the fallback
+ * works for any {@link Seekable} stream, not just those that also implement
+ * {@link org.apache.hadoop.fs.ByteBufferReadable}.
+ * <p>
+ * {@link FSInputStream} synchronizes its inherited implementation on {@code
this}, a different
+ * monitor from {@code positionedReadLock}; without this override the two
APIs can interleave.
+ */
+ @Override
+ public int read(long position, byte[] buffer, int offset, int length) throws
IOException {
Review Comment:
> ... we only support ByteBufferReadable , ...
In current code, are the inner input streams always ByteBufferReadable? If
yes, let's only support ByteBufferReadable. (We may add a assertion in the
constructor as well.)
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