tarantool / tarantool / 17739

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<a href="https://github.com/tarantool/tarantool/commit/<a class=hub.com/tarantool/tarantool/commit/df8f1fdaab8237ef6ea2e740ca28299d45f145fc">df8f1fdaa<a href="https://github.com/tarantool/tarantool/commit/df8f1fdaab8237ef6ea2e740ca28299d45f145fc">&quot;&gt;vinyl: fix vy_range_update_compaction_priority hang

Under certain circumstances vy_slice_new() may create an empty slice,
e.g. on range split:

   |------------------ Slice ---------------|
                         |---- Run -----|
                     +
                  split key
   |---- Slice 1 ----||------ Slice 2 ------|
         ^^^^^^^
          Empty

vy_range_update_compaction_priority() uses the size of the last slice in
a range as a base for LSM tree level sizing. If the slice size happens
to be 0, it will simply hang in an infinite loop. Fix this potential
hang by using 1 if the last slice size is 0.

(cherry picked from commit </a><a class="double-link" href="https://github.com/tarantool/tarantool/commit/<a class="double-link" href="https://github.com/tarantool/tarantool/commit/75dc3e64523c54640805f6d6bd798d961a75fb9e">75dc3e645</a>">75dc3e645</a><a href="https://github.com/tarantool/tarantool/commit/df8f1fdaab8237ef6ea2e740ca28299d45f145fc">)

41588 of 50415 relevant lines covered (82.49%)

845150.59 hits per line