From 94a55dfa34287d38f8cbe32f034ff6609a8a2a8b Mon Sep 17 00:00:00 2001
From: Preetam Jinka <Preetam@users.noreply.github.com>
Date: Wed, 28 Jun 2017 08:16:43 -0400
Subject: [PATCH] avoid deleting WAL with inconsistent state; #32 (#33)

---
 lm2.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lm2.go b/lm2.go
index 8b0d678..12bcd9e 100644
--- a/lm2.go
+++ b/lm2.go
@@ -757,7 +757,10 @@ func (c *Collection) Close() {
 	defer c.metaLock.Unlock()
 	c.f.Close()
 	c.wal.Close()
-	c.wal.Destroy()
+	if atomic.LoadUint32(&c.internalState) == 0 {
+		// Internal state is OK. Safe to delete WAL.
+		c.wal.Destroy()
+	}
 }
 
 // Version returns the last committed version.