minor, print the exception in log

Project: http://git-wip-us.apache.org/repos/asf/kylin/repo
Commit: http://git-wip-us.apache.org/repos/asf/kylin/commit/15dd1c12
Tree: http://git-wip-us.apache.org/repos/asf/kylin/tree/15dd1c12
Diff: http://git-wip-us.apache.org/repos/asf/kylin/diff/15dd1c12

Branch: refs/heads/master
Commit: 15dd1c12bc9b64981e14a6dbe2a28cd987acb588
Parents: f2f487f
Author: Cheng Wang <cheng.w...@kyligence.io>
Authored: Mon Dec 11 16:47:12 2017 +0800
Committer: Li Yang <liy...@apache.org>
Committed: Mon Dec 11 02:56:17 2017 -0600

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 .../org/apache/kylin/job/impl/threadpool/DefaultScheduler.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/kylin/blob/15dd1c12/core-job/src/main/java/org/apache/kylin/job/impl/threadpool/DefaultScheduler.java
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diff --git 
a/core-job/src/main/java/org/apache/kylin/job/impl/threadpool/DefaultScheduler.java
 
b/core-job/src/main/java/org/apache/kylin/job/impl/threadpool/DefaultScheduler.java
index 8f4ee37..b87a839 100644
--- 
a/core-job/src/main/java/org/apache/kylin/job/impl/threadpool/DefaultScheduler.java
+++ 
b/core-job/src/main/java/org/apache/kylin/job/impl/threadpool/DefaultScheduler.java
@@ -126,7 +126,7 @@ public class DefaultScheduler implements 
Scheduler<AbstractExecutable>, Connecti
                         + nStopped + " stopped, " + nReady + " ready, " + 
nSUCCEED + " already succeed, " + nError
                         + " error, " + nDiscarded + " discarded, " + nOthers + 
" others");
             } catch (Exception e) {
-                logger.warn("Job Fetcher caught a exception " + e);
+                logger.warn("Job Fetcher caught a exception ", e);
             }
         }
     }

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