From 37dca4d437e7bdbb2653b74bfc558fc146db6d4f Mon Sep 17 00:00:00 2001
From: fjy <fangjin@metamarkets.com>
Date: Tue, 20 May 2014 12:45:35 -0700
Subject: [PATCH] make sure the dynamic config has at least 1 thread

---
 .../druid/server/coordinator/CoordinatorDynamicConfig.java   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/server/src/main/java/io/druid/server/coordinator/CoordinatorDynamicConfig.java b/server/src/main/java/io/druid/server/coordinator/CoordinatorDynamicConfig.java
index 20cd594199..395646ad0c 100644
--- a/server/src/main/java/io/druid/server/coordinator/CoordinatorDynamicConfig.java
+++ b/server/src/main/java/io/druid/server/coordinator/CoordinatorDynamicConfig.java
@@ -53,7 +53,10 @@ public class CoordinatorDynamicConfig
     this.replicantLifetime = replicantLifetime;
     this.replicationThrottleLimit = replicationThrottleLimit;
     this.emitBalancingStats = emitBalancingStats;
-    this.balancerComputeThreads = Math.min(balancerComputeThreads, Runtime.getRuntime().availableProcessors() - 1);
+    this.balancerComputeThreads = Math.min(
+        Math.max(balancerComputeThreads, 1),
+        Runtime.getRuntime().availableProcessors() - 1
+    );
   }
 
   @JsonProperty
-- 
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