Do some rename works. :) And I think 7 ttl days is more common.

apm-collector/apm-collector-boot/docker/application.yml

@@ -37,4 +37,4 @@ storage:
     cluster_nodes: {ES_ADDRESSES}
     index_shards_number: 2
     index_replicas_number: 0
-    history_delete_before_days: 3
+    ttl: 7

apm-collector/apm-collector-boot/src/main/resources/application.yml

@@ -37,4 +37,4 @@ ui:
 #    cluster_nodes: localhost:9300
 #    index_shards_number: 2
 #    index_replicas_number: 0
-#    history_delete_before_days: 3
+#    ttl: 7
\ No newline at end of file

apm-collector/apm-collector-storage/collector-storage-es-provider/src/main/java/org/skywalking/apm/collector/storage/es/HistoryDataDeleteTimer.java → apm-collector/apm-collector-storage/collector-storage-es-provider/src/main/java/org/skywalking/apm/collector/storage/es/DataTTLKeeperTimer.java

@@ -22,7 +22,6 @@ import java.util.Calendar;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import org.skywalking.apm.collector.core.module.ModuleManager;
-import org.skywalking.apm.collector.core.util.CollectionUtils;
 import org.skywalking.apm.collector.storage.StorageModule;
 import org.skywalking.apm.collector.storage.dao.ICpuMetricPersistenceDAO;
 import org.skywalking.apm.collector.storage.dao.IGCMetricPersistenceDAO;
@@ -40,14 +39,14 @@ import org.skywalking.apm.collector.storage.dao.IServiceReferencePersistenceDAO;
 /**
  * @author peng-yongsheng
  */
-public class HistoryDataDeleteTimer {
+public class DataTTLKeeperTimer {
 
     private final ModuleManager moduleManager;
     private final StorageModuleEsNamingListener namingListener;
     private final String selfAddress;
     private final int daysBefore;
 
-    public HistoryDataDeleteTimer(ModuleManager moduleManager,
+    public DataTTLKeeperTimer(ModuleManager moduleManager,
         StorageModuleEsNamingListener namingListener, String selfAddress, int daysBefore) {
         this.moduleManager = moduleManager;
         this.namingListener = namingListener;
@@ -59,15 +58,6 @@ public class HistoryDataDeleteTimer {
         Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(this::delete, 1, 8, TimeUnit.HOURS);
     }
 
-    private void tryDelete() {
-        if (CollectionUtils.isNotEmpty(namingListener.getAddresses())) {
-            String firstAddress = namingListener.getAddresses().iterator().next();
-            if (firstAddress.equals(selfAddress)) {
-                delete();
-            }
-        }
-    }
-
     private void delete() {
         Calendar calendar = Calendar.getInstance();
         calendar.setTimeInMillis(System.currentTimeMillis());
@@ -82,11 +72,11 @@ public class HistoryDataDeleteTimer {
         calendar.set(Calendar.SECOND, 59);
         long endTimestamp = calendar.getTimeInMillis();
 
-        deleteJVMMetricData(startTimestamp, endTimestamp);
-        deleteTraceMetricData(startTimestamp, endTimestamp);
+        deleteJVMRelatedData(startTimestamp, endTimestamp);
+        deleteTraceRelatedData(startTimestamp, endTimestamp);
     }
 
-    private void deleteJVMMetricData(long startTimestamp, long endTimestamp) {
+    private void deleteJVMRelatedData(long startTimestamp, long endTimestamp) {
         ICpuMetricPersistenceDAO cpuMetricPersistenceDAO = moduleManager.find(StorageModule.NAME).getService(ICpuMetricPersistenceDAO.class);
         cpuMetricPersistenceDAO.deleteHistory(startTimestamp, endTimestamp);
 
@@ -100,7 +90,7 @@ public class HistoryDataDeleteTimer {
         memoryPoolMetricPersistenceDAO.deleteHistory(startTimestamp, endTimestamp);
     }
 
-    private void deleteTraceMetricData(long startTimestamp, long endTimestamp) {
+    private void deleteTraceRelatedData(long startTimestamp, long endTimestamp) {
         IGlobalTracePersistenceDAO globalTracePersistenceDAO = moduleManager.find(StorageModule.NAME).getService(IGlobalTracePersistenceDAO.class);
         globalTracePersistenceDAO.deleteHistory(startTimestamp, endTimestamp);
 

apm-collector/apm-collector-storage/collector-storage-es-provider/src/main/java/org/skywalking/apm/collector/storage/es/StorageModuleEsProvider.java

@@ -117,10 +117,10 @@ public class StorageModuleEsProvider extends ModuleProvider {
     private static final String CLUSTER_NODES = "cluster_nodes";
     private static final String INDEX_SHARDS_NUMBER = "index_shards_number";
     private static final String INDEX_REPLICAS_NUMBER = "index_replicas_number";
-    private static final String HISTORY_DELETE_BEFORE_DAYS = "history_delete_before_days";
+    private static final String TIME_TO_LIVE_OF_DATA = "ttl";
 
     private ElasticSearchClient elasticSearchClient;
-    private HistoryDataDeleteTimer deleteTimer;
+    private DataTTLKeeperTimer deleteTimer;
 
     @Override public String name() {
         return NAME;
@@ -163,8 +163,8 @@ public class StorageModuleEsProvider extends ModuleProvider {
         ModuleListenerService moduleListenerService = getManager().find(ClusterModule.NAME).getService(ModuleListenerService.class);
         moduleListenerService.addListener(namingListener);
 
-        Integer beforeDay = (Integer)config.getOrDefault(HISTORY_DELETE_BEFORE_DAYS, 3);
-        deleteTimer = new HistoryDataDeleteTimer(getManager(), namingListener, uuId + 0, beforeDay);
+        Integer beforeDay = (Integer)config.getOrDefault(TIME_TO_LIVE_OF_DATA, 3);
+        deleteTimer = new DataTTLKeeperTimer(getManager(), namingListener, uuId + 0, beforeDay);
     }
 
     @Override public void notifyAfterCompleted() throws ServiceNotProvidedException {