keith-turner opened a new pull request, #6010:
URL: https://github.com/apache/accumulo/pull/6010
Added per scan tracing statistics for the following :
* The count of compressed bytes read from DFS (when all data is read from
cache this will be zero).
* The count of uncompressed bytes read from DFS or cache
* The count of bytes returned (after iterators filter)
* The count of key/values read before any filtering
* The count of key/values returned after filtering
* The count of seeks done
* Statistics for cache hits, missed, and bypasses. A bypass is when a
rfile block is read w/o using the cache.
The statistics are included in a tracing span that wraps reading each each
batch of key values in tablet or scan server. So if a scan reads 10 batches of
key values, then 10 spans will be emitted for tracing data. Each span will
included the statistics for that batch.
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