Fix several mismatching default option values and their comments

kvrocks.conf

@@ -547,7 +547,7 @@ rocksdb.row_cache_size 0
 # files opened are always kept open. You can estimate number of files based
 # on target_file_size_base and target_file_size_multiplier for level-based
 # compaction. For universal-style compaction, you can usually set it to -1.
-# Default: 4096
+# Default: 8096
 rocksdb.max_open_files 8096
 
 # Amount of data to build up in memory (backed by an unsorted log
@@ -576,7 +576,7 @@ rocksdb.target_file_size_base 128
 # The default and the minimum number is 2, so that when 1 write buffer
 # is being flushed to storage, new writes can continue to the other
 # write buffer.
-# If max_write_buffer_number > 3, writing will be slowed down to
+# If max_write_buffer_number < 3, writing will be slowed down to
 # options.delayed_write_rate if we are writing to the last write buffer
 # allowed.
 rocksdb.max_write_buffer_number 4
@@ -603,7 +603,7 @@ rocksdb.max_background_flushes -1
 # This value represents the maximum number of threads that will
 # concurrently perform a compaction job by breaking it into multiple,
 # smaller ones that are run simultaneously.
-# Default: 2 (i.e. no subcompactions)
+# Default: 2
 rocksdb.max_sub_compactions 2
 
 # In order to limit the size of WALs, RocksDB uses DBOptions::max_total_wal_size
@@ -647,12 +647,12 @@ rocksdb.wal_size_limit_mb 16384
 # actual size of the unit read from disk may be smaller if
 # compression is enabled.
 #
-# Default: 4KB
+# Default: 16KB
 rocksdb.block_size 16384
 
 # Indicating if we'd put index/filter blocks to the block cache
 #
-# Default: no
+# Default: yes
 rocksdb.cache_index_and_filter_blocks yes
 
 # Specify the compression to use. Only compress level greater

src/config/config.cc

@@ -40,7 +40,7 @@
 #include "server/server.h"
 #include "status.h"
 
-constexpr const char *kDefaultBindAddress = "127.0.0.1";
+constexpr const char *kDefaultBindAddress = "0.0.0.0";
 
 constexpr const char *errBlobDbNotEnabled = "Must set rocksdb.enable_blob_files to yes first.";
 constexpr const char *errLevelCompactionDynamicLevelBytesNotSet =
@@ -162,14 +162,14 @@ Config::Config() {
       /* rocksdb options */
       {"rocksdb.compression", false,
        new EnumField(&rocks_db.compression, compression_types, rocksdb::CompressionType::kNoCompression)},
-      {"rocksdb.block_size", true, new IntField(&rocks_db.block_size, 4096, 0, INT_MAX)},
-      {"rocksdb.max_open_files", false, new IntField(&rocks_db.max_open_files, 4096, -1, INT_MAX)},
+      {"rocksdb.block_size", true, new IntField(&rocks_db.block_size, 16384, 0, INT_MAX)},
+      {"rocksdb.max_open_files", false, new IntField(&rocks_db.max_open_files, 8096, -1, INT_MAX)},
       {"rocksdb.write_buffer_size", false, new IntField(&rocks_db.write_buffer_size, 64, 0, 4096)},
       {"rocksdb.max_write_buffer_number", false, new IntField(&rocks_db.max_write_buffer_number, 4, 0, 256)},
       {"rocksdb.target_file_size_base", false, new IntField(&rocks_db.target_file_size_base, 128, 1, 1024)},
       {"rocksdb.max_background_compactions", false, new IntField(&rocks_db.max_background_compactions, 2, -1, 32)},
       {"rocksdb.max_background_flushes", true, new IntField(&rocks_db.max_background_flushes, 2, -1, 32)},
-      {"rocksdb.max_sub_compactions", false, new IntField(&rocks_db.max_sub_compactions, 1, 0, 16)},
+      {"rocksdb.max_sub_compactions", false, new IntField(&rocks_db.max_sub_compactions, 2, 0, 16)},
       {"rocksdb.delayed_write_rate", false, new Int64Field(&rocks_db.delayed_write_rate, 0, 0, INT64_MAX)},
       {"rocksdb.wal_ttl_seconds", true, new IntField(&rocks_db.wal_ttl_seconds, 3 * 3600, 0, INT_MAX)},
       {"rocksdb.wal_size_limit_mb", true, new IntField(&rocks_db.wal_size_limit_mb, 16384, 0, INT_MAX)},