Update dlmemalign call to prevent plasma store crash with -f flag

anuragkh · anuragkh · commit 81de6fca3e11 · 2019-01-18T20:57:35.000-08:00
diff --git 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);
     }

Original file line number	Diff line number	Diff line change
`@@ -913,7 +913,7 @@ class PlasmaStoreRunner {`
`913`	`913`	`// achieve that by mallocing and freeing a single large amount of space.`
`914`	`914`	`// that maximum allowed size up front.`
`915`	`915`	`if (use_one_memory_mapped_file) {`
`916`		`- void* pointer = plasma::dlmemalign(kBlockSize, system_memory);`
	`916`	`+ void* pointer = plasma::dlmemalign(kBlockSize, system_memory - 8192);`
`917`	`917`	`ARROW_CHECK(pointer != nullptr);`
`918`	`918`	`plasma::dlfree(pointer);`
`919`	`919`	`}`