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From Varun Sharma <va...@pinterest.com>
Subject Re: optimizing block cache requests + eviction
Date Mon, 08 Jul 2013 23:50:30 GMT
FYI, if u disable your block cache - you will ask for "Index" blocks for
every single request. So such a high rate of request is plausible for Index
blocks even when your requests are totally random on your data.


On Mon, Jul 8, 2013 at 4:45 PM, Viral Bajaria <viral.bajaria@gmail.com>wrote:

> 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 <jdcryans@apache.org
> >wrote:
> > Do you know if it's a data or meta block?

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