From c8c2044e40454530bbb14ffd07bfbef44f60ae16 Mon Sep 17 00:00:00 2001
From: Jonathan Ellis <jbellis@apache.org>
Date: Fri, 22 Mar 2013 19:52:52 -0500
Subject: [PATCH] prevent NPE when there is nothing to do

---
 .../org/apache/cassandra/db/compaction/CompactionManager.java  | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/java/org/apache/cassandra/db/compaction/CompactionManager.java b/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
index 335f9038f3..867227f206 100644
--- a/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
+++ b/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
@@ -184,6 +184,9 @@ public class CompactionManager implements CompactionManagerMBean
     private void performAllSSTableOperation(final ColumnFamilyStore cfs, final AllSSTablesOperation operation) throws InterruptedException, ExecutionException
     {
         final Collection<SSTableReader> sstables = cfs.markAllCompacting();
+        if (sstables == null)
+            return;
+
         Callable<Object> runnable = new Callable<Object>()
         {
             public Object call() throws IOException