if value of binlog pause status in zk is empty, dble report ArrayIndexOutOfBoundsException (#1837)

PanternBao · yanhuqing666 · commit 035f08064bad · 2020-05-04T08:50:45.000+08:00
diff --git a/src/main/java/com/actiontech/dble/server/OfflineStatusListener.java b/src/main/java/com/actiontech/dble/server/OfflineStatusListener.java
@@ -91,7 +91,7 @@ private void releaseForBinlog(String crashNode) {
         CuratorFramework zkConn = ZKUtils.getConnection();
         try {
             byte[] binlogStatusData = zkConn.getData().forPath(binlogStatusPath);
-            if (binlogStatusData == null) {
+            if (binlogStatusData == null || binlogStatusData.length == 0) {
                 return;
             }
             String data = new String(binlogStatusData, StandardCharsets.UTF_8);

Original file line number	Diff line number	Diff line change
`@@ -91,7 +91,7 @@ private void releaseForBinlog(String crashNode) {`
`91`	`91`	`CuratorFramework zkConn = ZKUtils.getConnection();`
`92`	`92`	`try {`
`93`	`93`	`byte[] binlogStatusData = zkConn.getData().forPath(binlogStatusPath);`
`94`		`- if (binlogStatusData == null) {`
	`94`	`+ if (binlogStatusData == null \|\| binlogStatusData.length == 0) {`
`95`	`95`	`return;`
`96`	`96`	`}`
`97`	`97`	`String data = new String(binlogStatusData, StandardCharsets.UTF_8);`