From 76a08df93980614a2dddf3f5115e35b5acce7be4 Mon Sep 17 00:00:00 2001
From: Gleb Natapov <gleb@scylladb.com>
Date: Thu, 20 Feb 2020 12:29:38 +0200
Subject: [PATCH] commitlog: fix size of a write used to zero a segment

Due to a bug the entire segment is written in one huge write of 32Mb.
The idea was to split it to writes of 128K, so fix it.

Fixes #5857

Message-Id: <20200220102939.30769-1-gleb@scylladb.com>
(cherry picked from commit df2f67626bce617b762c1dfe6f7441eceeb310d7)
---
 db/commitlog/commitlog.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/db/commitlog/commitlog.cc b/db/commitlog/commitlog.cc
index a209426ba2..2dd607f0b5 100644
--- a/db/commitlog/commitlog.cc
+++ b/db/commitlog/commitlog.cc
@@ -1323,7 +1323,7 @@ future<db::commitlog::segment_manager::sseg_ptr> db::commitlog::segment_manager:
                         std::vector<iovec> v;
                         v.reserve(n);
                         size_t m = 0;
-                        while (m < rem && n < max_write) {
+                        while (m < rem && n--) {
                             auto s = std::min(rem - m, buf_size);
                             v.emplace_back(iovec{ buf.get_write(), s});
                             m += s;