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Which issue does this PR close?
Part of #408
Rationale for this change
The target of #408 plan to limit output sst file, but there is no easy way to tell how large the output file will be, so
this PR use another strategy: limit total input size.
What changes are included in this PR?
When pick files for compaction, add a new limit:
max_input_sstable_size
,it will control total input file size to compact.
For now, we can custom it via environment variables, such as
Are there any user-facing changes?
No
How does this change test
New unit test
test_size_tiered_picker