Add support for TiKV flow control #384
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Signed-off-by: Yang Zhang <yang.zhang@pingcap.com>
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Replacing RocksDB's write stall mechanism with TiKV flow control.
This includes:
#251 add disable write stall option
#241 expose ingest level info, so that flow control knows which type of limit to apply. e.g. ingest to 0 is considered a flush, while, ingest to non-zero level is considered a compaction.
base_background_compactionrelated code in #251 is removed, since it has been deprecated in RocksDB