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ircd::db: Add note for delta encoding option; minor cleanup [ci skip]

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This commit is contained in:
Jason Volk 2020-08-05 23:08:51 -07:00
parent 65296be413
commit 59dd43917b
1 changed files with 7 additions and 4 deletions
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11
ircd/db.cc
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@ -2168,8 +2168,15 @@ ircd::db::database::column::column(database &d,
table_opts.pin_top_level_index_and_filter = false;
table_opts.pin_l0_filter_and_index_blocks_in_cache = false;
table_opts.partition_filters = true;
// Delta encoding is always used (option ignored) for table
// format_version >= 4 unless block_align=true.
table_opts.use_delta_encoding = false;
// Block alignment doesn't work if compression is enabled for this
// column. If not, we want block alignment for direct IO.
table_opts.block_align = this->options.compression == rocksdb::kNoCompression;
// Determine whether the index for this column should be compressed.
const bool is_string_index(this->descriptor->type.first == typeid(string_view));
const bool is_compression(this->options.compression != rocksdb::kNoCompression);
@ -2184,10 +2191,6 @@ ircd::db::database::column::column(database &d,
//table_opts.data_block_index_type = rocksdb::BlockBasedTableOptions::kDataBlockBinaryAndHash;
//table_opts.data_block_hash_table_util_ratio = 0.75;
// Block alignment doesn't work if compression is enabled for this
// column. If not, we want block alignment for direct IO.
table_opts.block_align = this->options.compression == rocksdb::kNoCompression;
// Setup the cache for assets.
const auto &cache_size(this->descriptor->cache_size);
if(cache_size != 0)