From 016fc46018893ea63e8f6171e782aa71fea7894e Mon Sep 17 00:00:00 2001
From: Roman Zeyde <me@romanzey.de>
Date: Mon, 30 Jul 2018 14:05:46 +0300
Subject: [PATCH] Reduce compaction readahead size to 1MB

Should reduce RAM consumption during full compaction stage,
without hurting the throughput too much.
---
 src/store.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/store.rs b/src/store.rs
index 98aeeb7..5e1b941 100644
--- a/src/store.rs
+++ b/src/store.rs
@@ -44,7 +44,7 @@ impl DBStore {
         db_opts.create_if_missing(true);
         // db_opts.set_keep_log_file_num(10);
         db_opts.set_max_open_files(2048);
-        db_opts.set_compaction_readahead_size(2 << 20);
+        db_opts.set_compaction_readahead_size(1 << 20);
         db_opts.set_compaction_style(rocksdb::DBCompactionStyle::Level);
         db_opts.set_compression_type(rocksdb::DBCompressionType::Snappy);
         db_opts.set_target_file_size_base(128 << 20);