remove System.out.println() to reduce output on console.

iotdb-cli/src/test/java/org/apache/iotdb/cli/client/AbstractClientIT.java

@@ -36,9 +36,11 @@ import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class AbstractClientIT {
-
+  private static Logger logger = LoggerFactory.getLogger(AbstractClientIT.class);
   @Mock
   private IoTDBConnection connection;
 
@@ -66,7 +68,7 @@ public class AbstractClientIT {
         AbstractClient.MAX_PRINT_ROW_COUNT_ARGS,};
     for (String keyword : keywords) {
       if (!AbstractClient.keywordSet.contains("-" + keyword)) {
-        System.out.println(keyword);
+        logger.error(keyword);
         fail();
       }
     }

iotdb-cli/src/test/java/org/apache/iotdb/cli/client/StartClientScriptIT.java

@@ -64,7 +64,6 @@ public class StartClientScriptIT extends AbstractScript {
         "---------------------",
         "IoTDB> Connection Error, please check whether the network is available or the server has started. Host is 127.0.0.1, port is 6668."};
     String dir = getCurrentPath("pwd");
-    System.out.println(dir);
     ProcessBuilder builder = new ProcessBuilder("sh",
         dir + File.separator + "cli" + File.separator + "bin" + File.separator + "start-client.sh",
         "-h",

iotdb/src/test/java/org/apache/iotdb/db/conf/adapter/IoTDBConfigDynamicAdapterTest.java

@@ -61,9 +61,9 @@ public class IoTDBConfigDynamicAdapterTest {
 
   @Test
   public void addOrDeleteStorageGroup() throws ConfigAdjusterException {
-    System.out.println(
-        "System total memory : " + Runtime.getRuntime().maxMemory() / IoTDBConstant.MB
-            + "MB");
+//    System.out.println(
+//        "System total memory : " + Runtime.getRuntime().maxMemory() / IoTDBConstant.MB
+//            + "MB");
     int memTableNum = IoTDBConfigDynamicAdapter.MEM_TABLE_AVERAGE_QUEUE_LEN;
     for (int i = 1; i < 100; i++) {
       IoTDBConfigDynamicAdapter.getInstance().addOrDeleteTimeSeries(1);
@@ -78,7 +78,7 @@ public class IoTDBConfigDynamicAdapterTest {
         assertEquals(CONFIG.getMaxMemtableNumber(), memTableNum);
       } catch (ConfigAdjusterException e) {
         assertEquals("The IoTDB system load is too large to create storage group.", e.getMessage());
-        System.out.println("it has created " + i + " storage groups.");
+        //System.out.println("it has created " + i + " storage groups.");
         assertEquals(CONFIG.getMaxMemtableNumber(), memTableNum);
         break;
       }
@@ -109,7 +109,7 @@ public class IoTDBConfigDynamicAdapterTest {
             totalTimeseries);
       } catch (ConfigAdjusterException e) {
         assertEquals("The IoTDB system load is too large to add timeseries.", e.getMessage());
-        System.out.println("it has added " + i + " timeseries.");
+        //System.out.println("it has added " + i + " timeseries.");
         assertEquals(IoTDBConfigDynamicAdapter.getInstance().getTotalTimeseries(),
             totalTimeseries);
         break;
@@ -130,7 +130,6 @@ public class IoTDBConfigDynamicAdapterTest {
         MManager.getInstance().setMaxSeriesNumberAmongStorageGroup(i / 30 + 1);
       }
     } catch (ConfigAdjusterException e) {
-      System.out.println(i);
       assertEquals("The IoTDB system load is too large to add timeseries.", e.getMessage());
     }
     int j =0;
@@ -141,7 +140,6 @@ public class IoTDBConfigDynamicAdapterTest {
         MManager.getInstance().setMaxSeriesNumberAmongStorageGroup(MManager.getInstance().getMaximalSeriesNumberAmongStorageGroups() + 1);
       }
     } catch (ConfigAdjusterException e ) {
-      System.out.println(j);
       assertEquals("The IoTDB system load is too large to add timeseries.", e.getMessage());
     }
   }

iotdb/src/test/java/org/apache/iotdb/db/engine/memtable/MemTablePoolTest.java

@@ -41,7 +41,6 @@ public class MemTablePoolTest {
   public void tearDown() throws Exception {
     isFinished = true;
     thread.join();
-    System.out.println(MemTablePool.getInstance().getSize());
   }
 
   @Test
@@ -55,7 +54,7 @@ public class MemTablePoolTest {
     System.out.println("memtable pool use deque and synchronized consume:" + time);
   }
 
-  @Test
+  //@Test
   public void testSort() {
     long start = System.currentTimeMillis();
     TreeMap<Long, Long> treeMap = new TreeMap<>();
@@ -63,7 +62,7 @@ public class MemTablePoolTest {
       treeMap.put((long) i, (long) i);
     }
     start = System.currentTimeMillis() - start;
-    System.out.println("time cost: " + start);
+    System.out.println("time cost of sort: " + start);
   }
 
 

iotdb/src/test/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessorTest.java

@@ -59,7 +59,6 @@ public class StorageGroupProcessorTest {
   @Test
   public void testSequenceSyncClose() {
     for (int j = 1; j <= 10; j++) {
-      System.out.println(j);
       TSRecord record = new TSRecord(j, deviceId);
       record.addTuple(DataPoint.getDataPoint(TSDataType.INT32, measurementId, String.valueOf(j)));
       processor.insert(new InsertPlan(record));

iotdb/src/test/java/org/apache/iotdb/db/integration/IOTDBFillIT.java

@@ -142,7 +142,6 @@ public class IOTDBFillIT {
       while (resultSet.next()) {
         String ans = resultSet.getString(TIMESTAMP_STR) + "," + resultSet.getString(TEMPERATURE_STR)
             + "," + resultSet.getString(STATUS_STR) + "," + resultSet.getString(HARDWARE_STR);
-        System.out.println(ans);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
       }
@@ -160,7 +159,6 @@ public class IOTDBFillIT {
             + "," + resultSet.getString(STATUS_STR) + "," + resultSet.getString(HARDWARE_STR);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
-        System.out.println(ans);
       }
       statement.close();
 
@@ -176,7 +174,6 @@ public class IOTDBFillIT {
             + "," + resultSet.getString(STATUS_STR) + "," + resultSet.getString(HARDWARE_STR);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
-        System.out.println(ans);
       }
       statement.close();
 
@@ -190,7 +187,6 @@ public class IOTDBFillIT {
       while (resultSet.next()) {
         String ans = resultSet.getString(TIMESTAMP_STR) + "," + resultSet.getString(TEMPERATURE_STR)
             + "," + resultSet.getString(STATUS_STR) + "," + resultSet.getString(HARDWARE_STR);
-        System.out.println(cnt + " " + ans);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
       }
@@ -244,7 +240,6 @@ public class IOTDBFillIT {
             + "," + resultSet.getString(STATUS_STR) + "," + resultSet.getString(HARDWARE_STR);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
-        System.out.println(ans);
       }
       statement.close();
 
@@ -260,7 +255,6 @@ public class IOTDBFillIT {
             + "," + resultSet.getString(STATUS_STR) + "," + resultSet.getString(HARDWARE_STR);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
-        System.out.println(ans);
       }
       statement.close();
       Assert.assertEquals(retArray1.length, cnt);
@@ -312,7 +306,6 @@ public class IOTDBFillIT {
             + "," + resultSet.getString(STATUS_STR) + "," + resultSet.getString(HARDWARE_STR);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
-        System.out.println(ans);
       }
       statement.close();
 

iotdb/src/test/java/org/apache/iotdb/db/integration/IOTDBGroupByIT.java

@@ -274,7 +274,6 @@ public class IOTDBGroupByIT {
             + "," + resultSet.getString(min_time("root.ln.wf01.wt01.temperature"));
         Assert.assertEquals(retArray2[cnt], ans);
         cnt++;
-        //System.out.println(ans);
       }
       Assert.assertEquals(retArray2.length, cnt);
       statement.close();
@@ -331,7 +330,6 @@ public class IOTDBGroupByIT {
         String ans = resultSet.getString(TIMESTAMP_STR) + "," + resultSet
             .getString(last("root.ln.wf01.wt01.temperature"))
             + "," + resultSet.getString(first("root.ln.wf01.wt01.temperature"));
-        System.out.println(ans);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
       }
@@ -351,7 +349,6 @@ public class IOTDBGroupByIT {
         String ans = resultSet.getString(TIMESTAMP_STR) + "," + resultSet
             .getString(last("root.ln.wf01.wt01.temperature"))
             + "," + resultSet.getString(first("root.ln.wf01.wt01.temperature"));
-        System.out.println(ans);
         Assert.assertEquals(retArray2[cnt], ans);
         cnt++;
       }
@@ -423,7 +420,6 @@ public class IOTDBGroupByIT {
             + "," + resultSet.getString(min_time("root.ln.wf01.wt01.temperature"));
         Assert.assertEquals(retArray2[cnt], ans);
         cnt++;
-        //System.out.println(ans);
       }
       Assert.assertEquals(retArray2.length, cnt);
       statement.close();
@@ -468,7 +464,6 @@ public class IOTDBGroupByIT {
             .getString(last("root.ln.wf01.wt01.temperature"))
             + "," + resultSet.getString(first("root.ln.wf01.wt01.temperature")) + ","
             + resultSet.getString(sum("root.ln.wf01.wt01.temperature"));
-        System.out.println(ans);
         Assert.assertEquals(retArray1[cnt], ans);
         cnt++;
       }
@@ -489,7 +484,6 @@ public class IOTDBGroupByIT {
             .getString(last("root.ln.wf01.wt01.temperature"))
             + "," + resultSet.getString(first("root.ln.wf01.wt01.temperature")) + ","
             + resultSet.getString(sum("root.ln.wf01.wt01.temperature"));
-        System.out.println(ans);
         Assert.assertEquals(retArray2[cnt], ans);
         cnt++;
       }

iotdb/src/test/java/org/apache/iotdb/db/integration/IoTDBAggregationLargeDataIT.java

@@ -853,7 +853,6 @@ public class IoTDBAggregationLargeDataIT {
       }
 
       statement.execute("flush");
-      System.out.println("cnt = " + cnt);
 
       // insert large amount of data
       for (int time = 3700; time < 4000; time++) {
@@ -878,10 +877,6 @@ public class IoTDBAggregationLargeDataIT {
       }
 
 //      statement.execute("merge");
-
-      System.out.println("large insert cnt = " + cnt);
-      System.out
-          .println("d0s0sum = " + d0s0sum + "; d0s1sum = " + d0s1sum + "; d0s2sum = " + d0s2sum);
       for (String sql : insertSql) {
         statement.execute(sql);
       }

iotdb/src/test/java/org/apache/iotdb/db/integration/IoTDBAuthorizationIT.java

@@ -34,12 +34,15 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Notice that, all test begins with "IoTDB" is integration test. All test which will start the IoTDB server should be
  * defined as integration test.
  */
 public class IoTDBAuthorizationIT {
+  private static Logger logger = LoggerFactory.getLogger(IoTDBAuthorizationIT.class);
 
   private IoTDB daemon;
 
@@ -626,9 +629,10 @@ public class IoTDBAuthorizationIT {
       userStmt.executeBatch();
       userStmt.clearBatch();
     }
-    System.out.println(
-        "User inserted " + insertCnt + " data points used " + (System.currentTimeMillis() - time)
-            + " ms with " + privilegeCnt + " privileges");
+    if (logger.isDebugEnabled()) {
+      logger.debug("User inserted {} data points used {} ms with {} privileges.", insertCnt,
+          System.currentTimeMillis() - time, privilegeCnt);
+    }
 
     time = System.currentTimeMillis();
     for (int i = 0; i < insertCnt; ) {
@@ -639,10 +643,10 @@ public class IoTDBAuthorizationIT {
       adminStmt.executeBatch();
       adminStmt.clearBatch();
     }
-    System.out.println(
-        "admin inserted " + insertCnt + " data points used " + (System.currentTimeMillis() - time)
-            + " ms with " + privilegeCnt + " privileges");
-
+    if (logger.isDebugEnabled()) {
+      logger.debug("User inserted {} data points used {} ms with {} privileges.", insertCnt,
+          System.currentTimeMillis() - time, privilegeCnt);
+    }
     adminCon.close();
     userCon.close();
   }

iotdb/src/test/java/org/apache/iotdb/db/integration/IoTDBEngineTimeGeneratorIT.java

@@ -190,7 +190,7 @@ public class IoTDBEngineTimeGeneratorIT {
    */
   @Test
   public void testOneSeriesWithValueAndTimeFilter() throws IOException, StorageEngineException {
-    System.out.println("Test >>> root.vehicle.d0.s0 >= 14 && time > 500");
+    //System.out.println("Test >>> root.vehicle.d0.s0 >= 14 && time > 500");
 
     Path pd0s0 = new Path(Constant.d0s0);
     ValueFilter.ValueGtEq valueGtEq = ValueFilter.gtEq(14);
@@ -216,7 +216,7 @@ public class IoTDBEngineTimeGeneratorIT {
    */
   @Test
   public void testEmptySeriesWithValueFilter() throws IOException, StorageEngineException {
-    System.out.println("Test >>> root.vehicle.d1.s0 >= 5");
+    //System.out.println("Test >>> root.vehicle.d1.s0 >= 5");
 
     Path pd1s0 = new Path(Constant.d1s0);
     ValueFilter.ValueGtEq valueGtEq = ValueFilter.gtEq(5);

iotdb/src/test/java/org/apache/iotdb/db/integration/IoTDBSeriesReaderIT.java

@@ -241,7 +241,7 @@ public class IoTDBSeriesReaderIT {
   @Test
   public void selectAllTest() throws IOException, StorageEngineException {
     String selectSql = "select * from root";
-    System.out.println("Test >>> " + selectSql);
+    //System.out.println("Test >>> " + selectSql);
 
     EngineQueryRouter engineExecutor = new EngineQueryRouter();
     QueryExpression queryExpression = QueryExpression.create();
@@ -273,7 +273,7 @@ public class IoTDBSeriesReaderIT {
   public void selectOneSeriesWithValueFilterTest() throws IOException, StorageEngineException {
 
     String selectSql = "select s0 from root.vehicle.d0 where s0 >= 20";
-    System.out.println("Test >>> " + selectSql);
+    //System.out.println("Test >>> " + selectSql);
 
     EngineQueryRouter engineExecutor = new EngineQueryRouter();
     QueryExpression queryExpression = QueryExpression.create();
@@ -302,7 +302,7 @@ public class IoTDBSeriesReaderIT {
   @Test
   public void seriesTimeDigestReadTest() throws IOException, StorageEngineException {
     String selectSql = "select s0 from root.vehicle.d0 where time >= 22987";
-    System.out.println("Test >>> " + selectSql);
+    //System.out.println("Test >>> " + selectSql);
 
     EngineQueryRouter engineExecutor = new EngineQueryRouter();
     QueryExpression queryExpression = QueryExpression.create();
@@ -329,7 +329,7 @@ public class IoTDBSeriesReaderIT {
 
   @Test
   public void crossSeriesReadUpdateTest() throws IOException, StorageEngineException {
-    System.out.println("Test >>> select s1 from root.vehicle.d0 where s0 < 111");
+    //System.out.println("Test >>> select s1 from root.vehicle.d0 where s0 < 111");
     EngineQueryRouter engineExecutor = new EngineQueryRouter();
     QueryExpression queryExpression = QueryExpression.create();
     Path path1 = new Path(Constant.d0s0);

iotdb/src/test/java/org/apache/iotdb/db/metadata/MManagerImproveTest.java

@@ -32,8 +32,11 @@ import org.apache.iotdb.tsfile.read.common.Path;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class MManagerImproveTest {
+  private static Logger logger = LoggerFactory.getLogger(MManagerImproveTest.class);
 
   private static final int TIMESERIES_NUM = 1000;
   private static final int DEVICE_NUM = 10;
@@ -120,11 +123,11 @@ public class MManagerImproveTest {
     endTime = System.currentTimeMillis();
     get_seriestype += endTime - startTime;
 
-    System.out.println("string combine:\t" + string_combine);
-    System.out.println("seriesPath exist:\t" + path_exist);
-    System.out.println("list init:\t" + list_init);
-    System.out.println("check file level:\t" + check_filelevel);
-    System.out.println("get series type:\t" + get_seriestype);
+    logger.debug("string combine:\t" + string_combine);
+    logger.debug("seriesPath exist:\t" + path_exist);
+    logger.debug("list init:\t" + list_init);
+    logger.debug("check file level:\t" + check_filelevel);
+    logger.debug("get series type:\t" + get_seriestype);
   }
 
   public void doOriginTest(String deviceId, List<String> measurementList)
@@ -239,42 +242,42 @@ public class MManagerImproveTest {
       doOriginTest(deviceId, measurementList);
     }
     endTime = System.currentTimeMillis();
-    System.out.println("origin:\t" + (endTime - startTime));
+    logger.debug("origin:\t" + (endTime - startTime));
 
     startTime = System.currentTimeMillis();
     for (String deviceId : deviceIdList) {
       doPathLoopOnceTest(deviceId, measurementList);
     }
     endTime = System.currentTimeMillis();
-    System.out.println("seriesPath loop once:\t" + (endTime - startTime));
+    logger.debug("seriesPath loop once:\t" + (endTime - startTime));
 
     startTime = System.currentTimeMillis();
     for (String deviceId : deviceIdList) {
       doDealdeviceIdOnceTest(deviceId, measurementList);
     }
     endTime = System.currentTimeMillis();
-    System.out.println("deal deviceId once:\t" + (endTime - startTime));
+    logger.debug("deal deviceId once:\t" + (endTime - startTime));
 
     startTime = System.currentTimeMillis();
     for (String deviceId : deviceIdList) {
       doRemoveListTest(deviceId, measurementList);
     }
     endTime = System.currentTimeMillis();
-    System.out.println("remove list:\t" + (endTime - startTime));
+    logger.debug("remove list:\t" + (endTime - startTime));
 
     startTime = System.currentTimeMillis();
     for (String deviceId : deviceIdList) {
       doAllImproveTest(deviceId, measurementList);
     }
     endTime = System.currentTimeMillis();
-    System.out.println("improve all:\t" + (endTime - startTime));
+    logger.debug("improve all:\t" + (endTime - startTime));
 
     startTime = System.currentTimeMillis();
     for (String deviceId : deviceIdList) {
       doCacheTest(deviceId, measurementList);
     }
     endTime = System.currentTimeMillis();
-    System.out.println("add cache:\t" + (endTime - startTime));
+    logger.debug("add cache:\t" + (endTime - startTime));
   }
 
   @After

iotdb/src/test/java/org/apache/iotdb/db/metadata/MTreeTest.java

@@ -117,7 +117,6 @@ public class MTreeTest {
       assertEquals("root.a.d1.s0", result.get("root.a.d1").get(0));
       assertTrue(result.containsKey("root.a.d0"));
       assertEquals("root.a.d0.s0", result.get("root.a.d0").get(0));
-      System.out.println(result);
 
       result = root.getAllPath("root.a.*.*.s0");
       assertTrue(result.containsKey("root.a.b.d0"));

iotdb/src/test/java/org/apache/iotdb/db/qp/plan/PhysicalPlanTest.java

@@ -93,7 +93,6 @@ public class PhysicalPlanTest {
     String sql = "grant role xm privileges 'SET_STORAGE_GROUP','DELETE_TIMESERIES' on root.vehicle.d1.s1";
     QueryProcessor processor = new QueryProcessor(new MemIntQpExecutor());
     AuthorPlan plan = (AuthorPlan) processor.parseSQLToPhysicalPlan(sql);
-    System.out.println(plan.toString());
     assertEquals(
         "userName: null\n" + "roleName: xm\n" + "password: null\n" + "newPassword: null\n"
             + "permissions: [0, 5]\n" + "nodeName: root.vehicle.d1.s1\n" + "authorType: GRANT_ROLE",

iotdb/src/test/java/org/apache/iotdb/db/writelog/IoTDBLogFileSizeTest.java

@@ -105,7 +105,7 @@ public class IoTDBLogFileSizeTest {
         Statement statement = connection.createStatement();
         while (true) {
           if (Thread.interrupted()) {
-            System.out.println("Exit after " + cnt + " insertion");
+            //System.out.println("Exit after " + cnt + " insertion");
             break;
           }
           String sql = String.format(
@@ -139,9 +139,6 @@ public class IoTDBLogFileSizeTest {
     while (writeThread.isAlive()) {
 
     }
-    System.out.println(
-        "Max size of seq wal is " + MemUtils.bytesCntToStr(maxLength[0]) + " after "
-            + runtime + "ms continuous writing");
   }
 
   @Test
@@ -165,7 +162,7 @@ public class IoTDBLogFileSizeTest {
         Statement statement = connection.createStatement();
         while (true) {
           if (Thread.interrupted()) {
-            System.out.println("Exit after " + cnt + " insertion");
+            //System.out.println("Exit after " + cnt + " insertion");
             break;
           }
           String sql = String
@@ -199,9 +196,6 @@ public class IoTDBLogFileSizeTest {
     while (writeThread.isAlive()) {
 
     }
-    System.out.println(
-        "Max size of unsequence wal is " + MemUtils.bytesCntToStr(maxLength[0]) + " after " + runtime
-            + "ms continuous writing");
   }
 
   private void executeSQL(String[] sqls) throws ClassNotFoundException, SQLException {

iotdb/src/test/java/org/apache/iotdb/db/writelog/PerformanceTest.java

@@ -95,7 +95,7 @@ public class PerformanceTest {
           logNode.write(deletePlan);
         }
         logNode.forceSync();
-        System.out.println("forceWalPeriodInMs = " + config.getForceWalPeriodInMs());
+
         System.out.println(
             3000000 + " logs use " + (System.currentTimeMillis() - time) + " ms at batch size "
                 + config.getFlushWalThreshold());

tsfile/src/test/java/org/apache/iotdb/tsfile/compress/SnappyTest.java

@@ -79,7 +79,6 @@ public class SnappyTest {
         .allocateDirect(Snappy.uncompressedLength(compressed) + 1);
     Snappy.uncompress(compressed, uncompressedByteBuffer);
     System.out.println("decompression time cost:" + (System.currentTimeMillis() - time));
-    System.out.println(uncompressedByteBuffer.remaining());
     assert input.equals(ReadWriteIOUtils.readStringFromDirectByteBuffer(uncompressedByteBuffer));
   }
 

tsfile/src/test/java/org/apache/iotdb/tsfile/encoding/decoder/delta/DeltaBinaryEncoderIntegerTest.java

@@ -46,7 +46,6 @@ public class DeltaBinaryEncoderIntegerTest {
 
   @Test
   public void testBasic() throws IOException {
-    System.out.println("write basic");
     int data[] = new int[ROW_NUM];
     for (int i = 0; i < ROW_NUM; i++) {
       data[i] = i * i;
@@ -56,7 +55,6 @@ public class DeltaBinaryEncoderIntegerTest {
 
   @Test
   public void testBoundInt() throws IOException {
-    System.out.println("write bounded int");
     int data[] = new int[ROW_NUM];
     for (int i = 0; i < 10; i++) {
       boundInt(i, data);
@@ -64,7 +62,6 @@ public class DeltaBinaryEncoderIntegerTest {
   }
 
   private void boundInt(int power, int[] data) throws IOException {
-    System.out.println("the bound of 2 power:" + power);
     for (int i = 0; i < ROW_NUM; i++) {
       data[i] = ran.nextInt((int) Math.pow(2, power));
     }
@@ -73,7 +70,6 @@ public class DeltaBinaryEncoderIntegerTest {
 
   @Test
   public void testRandom() throws IOException {
-    System.out.println("write random");
     int data[] = new int[ROW_NUM];
     for (int i = 0; i < ROW_NUM; i++) {
       data[i] = ran.nextInt();
@@ -83,7 +79,6 @@ public class DeltaBinaryEncoderIntegerTest {
 
   @Test
   public void testMaxMin() throws IOException {
-    System.out.println("write maxmin");
     int data[] = new int[ROW_NUM];
     for (int i = 0; i < ROW_NUM; i++) {
       data[i] = (i & 1) == 0 ? Integer.MAX_VALUE : Integer.MIN_VALUE;
@@ -99,11 +94,11 @@ public class DeltaBinaryEncoderIntegerTest {
   }
 
   private void shouldReadAndWrite(int[] data, int length) throws IOException {
-    System.out.println("source data size:" + 4 * length + " byte");
+    //System.out.println("source data size:" + 4 * length + " byte");
     out = new ByteArrayOutputStream();
     writeData(data, length);
     byte[] page = out.toByteArray();
-    System.out.println("encoding data size:" + page.length + " byte");
+    //System.out.println("encoding data size:" + page.length + " byte");
     buffer = ByteBuffer.wrap(page);
     int i = 0;
     while (reader.hasNext(buffer)) {

tsfile/src/test/java/org/apache/iotdb/tsfile/utils/BytesUtilsTest.java

@@ -284,7 +284,6 @@ public class BytesUtilsTest {
 
   @Test
   public void testLongToBytesWithWidth() {
-    System.out.println();
     int bitLen = 42;
     long basic = (1 << 30) * 2l;
     long b1 = (1 << (bitLen % 32)) * basic + r.nextInt();

tsfile/src/test/java/org/apache/iotdb/tsfile/write/WriteTest.java

@@ -222,7 +222,6 @@ public class WriteTest {
       strings = getNextRecord(lineCount, stageState);
       for (String str : strings) {
         TSRecord record = RecordUtils.parseSimpleTupleRecord(str, schema);
-        System.out.println(str);
         tsFileWriter.write(record);
       }
       lineCount++;