Use CacheDependencies() at start of ApproximateKeyAnchors() (#11230)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/11230
Test Plan:
- setup command: `$ ./db_bench -benchmarks=fillrandom,compact -compression_type=none -num=1000000 -write_buffer_size=4194304 -target_file_size_base=4194304 -use_direct_io_for_flush_and_compaction=true -partition_index_and_filters=true -bloom_bits=10 -metadata_block_size=1024`
- measure small read count bucketed by size: `$ strace -fye pread64 ./db_bench.ctrl -use_existing_db=true -benchmarks=compact -compaction_readahead_size=4194304 -compression_type=none -num=1000000 -write_buffer_size=4194304 -target_file_size_base=4194304 -use_direct_io_for_flush_and_compaction=true -partition_index_and_filters=true -bloom_bits=10 -metadata_block_size=1024 -subcompactions=4 -cache_size=1048576000 2>&1 >/dev/null | awk '/= [0-9]+$/{print "[", int($NF / 1024), "KB,", int(1 + $NF / 1024), "KB)"}' | sort -n -k 2 | uniq -c | head -3`
- before:
```
1119 [ 0 KB, 1 KB)
1 [ 6 KB, 7 KB)
2 [ 7 KB, 8 KB)
```
- after:
```
242 [ 0 KB, 1 KB)
1 [ 6 KB, 7 KB)
2 [ 7 KB, 8 KB)
```
Reviewed By: pdillinger
Differential Revision: D43388507
Pulled By: ajkr
fbshipit-source-id: a02413c9f615b00784700646825a9870ee10f3a7
Andrew Kryczka