Github user kkhatua commented on the issue:
https://github.com/apache/drill/pull/755
Thanks, @vrozov. I'll make use of a separate lock for read-only purpose in
case of `#1`.
For `#2`, I need to construct a size-limited ordered set from a list of
unordered elements.
In this case, the elements (i.e. profiles) need to be ordered by file-name,
which is a 1:1 mapping function of the start time epoch for the query.
So, I need to be able to add to such a datastructure in `O(log(n))` time,
remove in `O(1)` and iterate through it in sequence. So, my puts are the most
expensive operation.
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