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first step to keep task attributes for staging tasks and time window support for async log grep - #850
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A grep reaches the recent part of a live log only with tail_bytes, and cold disks read 7 to 33 MB/s, so a tail of 3 GiB often outlasts the 240 s a grep may run and returns nothing: what a busy panda-DBProxy.log took more than about three hours ago could not be read before the next morning's .gz. submit_grep_request takes since and until, in UTC as the log stamps are, for a plain file with whole_records. The processor bisects the file on the time stamps of its records to find the bytes that hold the window, 60 s wider on each side for records written out of order, and passes only those to rg, from a thread that reads the file it bisected. The window in the result says where the bytes searched start and end. One of more than 1 GiB is cut, which window.cut says rather than truncated, as it calls for asking further rather than differently. tail_bytes goes through the same reader instead of tail.
Commented out the conditional check for 'staged' task status.
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