From d84046daf99c433990b1de87b25952783119b094 Mon Sep 17 00:00:00 2001
From: Anurag Khandelwal <anuragk@berkeley.edu>
Date: Fri, 18 Jan 2019 20:57:35 -0800
Subject: [PATCH] Update dlmemalign call to prevent plasma store crash with -f
 flag

---
 cpp/src/plasma/store.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/src/plasma/store.cc b/cpp/src/plasma/store.cc
index f6326ccf588de..67f019afb2504 100644
--- a/cpp/src/plasma/store.cc
+++ b/cpp/src/plasma/store.cc
@@ -913,7 +913,7 @@ class PlasmaStoreRunner {
     // achieve that by mallocing and freeing a single large amount of space.
     // that maximum allowed size up front.
     if (use_one_memory_mapped_file) {
-      void* pointer = plasma::dlmemalign(kBlockSize, system_memory);
+      void* pointer = plasma::dlmemalign(kBlockSize, system_memory - 8192);
       ARROW_CHECK(pointer != nullptr);
       plasma::dlfree(pointer);
     }