use placeholders with {} for all arguments

Author: bsglz

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SteppingAllStoresSizeSplitPolicy.java

@@ -38,9 +38,9 @@ protected boolean isExceedSize(int tableRegionsCount, long sizeToCheck) {
     }
     if (sumSize > sizeToCheck) {
       LOG.debug("ShouldSplit because region size is big enough " +
-        " size=" + StringUtils.humanSize(sumSize) +
-        ", sizeToCheck=" + StringUtils.humanSize(sizeToCheck) +
-        ", regionsWithCommonTable=" + tableRegionsCount);
+        "size={}, sizeToCheck={}, regionsWithCommonTable={}",
+        StringUtils.humanSize(sumSize), StringUtils.humanSize(sizeToCheck),
+        tableRegionsCount);
       return true;
     }
     return false;