Good question. When I looked at the logs, it's not clear from it whether it's reading a meta or data block. Is there any kind of log line that indicates that ? Given that it's saying that it's ready from a startOffset I would assume this is a data block.
A question that comes to mind, is this read doing a seek to that position directly or is it going to cache the block ? Looks like it is not caching the block if it's reading directly from a given offset. Or am I wrong ? Following is a sample line that I used while debugging: 2013-07-08 22:58:55,221 DEBUG org.apache.hadoop.hdfs.DFSClient: New BlockReaderLocal for file /mnt/data/current/subdir34/subdir26/blk_-448970697931783518 of size 67108864 startOffset 13006577 length 54102287 short circuit checksum true On Mon, Jul 8, 2013 at 4:37 PM, Jean-Daniel Cryans <jdcry...@apache.org>wrote: > Do you know if it's a data or meta block?
