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Use L1 size as estimate for L0 size in LevelCompactionBuilder::GetPathID #2903

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Use L1 size as estimate for L0 size in LevelCompactionBuilder::GetPathID #2903

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8 changes: 6 additions & 2 deletions db/compaction_picker.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1279,6 +1279,8 @@ uint32_t LevelCompactionBuilder::GetPathId(
uint64_t level_size;
int cur_level = 0;

// max_bytes_for_level_base denotes L1 size.
// We estimate L0 size to be the same as L1.
level_size = mutable_cf_options.max_bytes_for_level_base;

// Last path is the fallback
Expand All @@ -1289,8 +1291,10 @@ uint32_t LevelCompactionBuilder::GetPathId(
return p;
} else {
current_path_size -= level_size;
level_size = static_cast<uint64_t>(
level_size * mutable_cf_options.max_bytes_for_level_multiplier);
if (cur_level > 0) {
level_size = static_cast<uint64_t>(
level_size * mutable_cf_options.max_bytes_for_level_multiplier);
}
cur_level++;
continue;
}
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