From d51eb0b583fe28ede2b4a6d778de4489433f1bbf Mon Sep 17 00:00:00 2001
From: Zhongyi Xie <miasantreble@users.noreply.github.com>
Date: Wed, 1 May 2019 20:36:09 -0700
Subject: [PATCH] set snappy compression only when supported (#4325)

Summary:
Right now `OptimizeLevelStyleCompaction` may set compression type to Snappy even when Snappy is not supported, this may cause errors like "no snappy compression support"
Fixes https://github.com/facebook/rocksdb/issues/4283
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4325

Differential Revision: D15125542

Pulled By: miasantreble

fbshipit-source-id: 70890b73ababe16752721555dbd290633c2aafac
---
 options/options.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/options/options.cc b/options/options.cc
index bfe3e313d..5e0c539af 100644
--- a/options/options.cc
+++ b/options/options.cc
@@ -548,7 +548,10 @@ ColumnFamilyOptions* ColumnFamilyOptions::OptimizeLevelStyleCompaction(
     if (i < 2) {
       compression_per_level[i] = kNoCompression;
     } else {
-      compression_per_level[i] = kSnappyCompression;
+      compression_per_level[i] =
+          LZ4_Supported()
+              ? kLZ4Compression
+              : (Snappy_Supported() ? kSnappyCompression : kNoCompression);
     }
   }
   return this;