[ROCKETMQ-9] Clean up the code

rocketmq-store/src/main/java/com/alibaba/rocketmq/store/MappedFileQueue.java

@@ -484,10 +484,10 @@ public class MappedFileQueue {
                 try {
                     return this.mappedFiles.get(index);
                 } catch (Exception e) {
-                    if (returnFirstOnNotFound)
+                    if (returnFirstOnNotFound) {
                         return mappedFile;
-
-                    LOG_ERROR.warn("findMappedFileByOffset failure. {}", UtilAll.currentStackTrace());
+                    }
+                    LOG_ERROR.warn("findMappedFileByOffset failure. ", e);
                 }
             }
         } catch (Exception e) {

rocketmq-store/src/main/java/com/alibaba/rocketmq/store/index/IndexService.java

@@ -279,7 +279,7 @@ public class IndexService {
      *
      * @return {@link IndexFile} or null on failure.
      */
-    private IndexFile retryGetAndCreateIndexFile() {
+    public IndexFile retryGetAndCreateIndexFile() {
         IndexFile indexFile = null;
 
         for (int times = 0; null == indexFile && times < MAX_TRY_IDX_CREATE; times++) {
@@ -288,7 +288,7 @@ public class IndexService {
                 break;
 
             try {
-                log.error("Tried to create index file " + times + " times");
+                log.info("Tried to create index file " + times + " times");
                 Thread.sleep(1000);
             } catch (InterruptedException e) {
                 e.printStackTrace();

rocketmq-store/src/test/resources/logback-test.xml

@@ -20,6 +20,7 @@
   <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
     <encoder>
       <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{5} - %msg%n</pattern>
+      <charset class="java.nio.charset.Charset">UTF-8</charset>
     </encoder>
   </appender>