morningman commented on a change in pull request #6200:
URL: https://github.com/apache/incubator-doris/pull/6200#discussion_r670383438



##########
File path: fe/fe-core/src/main/java/org/apache/doris/common/Config.java
##########
@@ -735,9 +735,17 @@
      */
     @ConfField(mutable = true, masterOnly = true)
     public static int max_backend_down_time_second = 3600; // 1h
+
+    /**
+     * If disable_storage_medium_check is true, ReportHandler would not check 
tablet's storage medium
+     * and disable storage cool down function, the default value is false.
+     * You can set the value true when you don't care what the storage medium 
of the tablet is.
+     */
+    @ConfField(mutable = true, masterOnly = true)
+    public static boolean disable_storage_medium_check = false;

Review comment:
       Better not changing the default value.
   And why not using origin config name?

##########
File path: 
fe/fe-core/src/main/java/org/apache/doris/catalog/TabletInvertedIndex.java
##########
@@ -484,40 +512,40 @@ public void setNewSchemaHash(long partitionId, long 
indexId, int newSchemaHash)
         if (Catalog.isCheckpointThread()) {
             return;
         }
-        writeLock();
+        readLock();

Review comment:
       Why change to write lock?

##########
File path: fe/fe-core/src/main/java/org/apache/doris/master/ReportHandler.java
##########
@@ -17,6 +17,7 @@
 
 package org.apache.doris.master;
 
+import com.google.common.collect.Sets;

Review comment:
       import order

##########
File path: fe/fe-core/src/main/java/org/apache/doris/master/ReportHandler.java
##########
@@ -660,51 +679,64 @@ private static void deleteFromBackend(Map<Long, TTablet> 
backendTablets,
         int deleteFromBackendCounter = 0;
         int addToMetaCounter = 0;
         AgentBatchTask batchTask = new AgentBatchTask();
-        for (Long tabletId : backendTablets.keySet()) {
-            TTablet backendTablet = backendTablets.get(tabletId);
-            for (TTabletInfo backendTabletInfo : 
backendTablet.getTabletInfos()) {
-                boolean needDelete = false;
-                if (!foundTabletsWithValidSchema.contains(tabletId)) {
-                    if (isBackendReplicaHealthy(backendTabletInfo)) {
-                        // if this tablet is not in meta. try adding it.
-                        // if add failed. delete this tablet from backend.
-                        try {
-                            addReplica(tabletId, backendTabletInfo, backendId);
-                            // update counter
-                            needDelete = false;
-                            ++addToMetaCounter;
-                        } catch (MetaNotFoundException e) {
-                            LOG.warn("failed add to meta. tablet[{}], 
backend[{}]. {}",
-                                    tabletId, backendId, e.getMessage());
-                            needDelete = true;
-                        }
-                    } else {
-                        needDelete = true;
-                    }
-                }
-
-                if (needDelete) {
-                    // drop replica
-                    DropReplicaTask task = new DropReplicaTask(backendId, 
tabletId, backendTabletInfo.getSchemaHash());
-                    batchTask.addTask(task);
-                    LOG.warn("delete tablet[" + tabletId + " - " + 
backendTabletInfo.getSchemaHash()
-                            + "] from backend[" + backendId + "] because not 
found in meta");
-                    ++deleteFromBackendCounter;
-                }
-            } // end for tabletInfos
-
-            if (foundTabletsWithInvalidSchema.containsKey(tabletId)) {
-                // this tablet is found in meta but with invalid schema hash.
-                // delete it.
+        if (foundTabletsWithValidSchema.size() + 
foundTabletsWithInvalidSchema.size() == backendTablets.size()) {

Review comment:
       Add comment to explain this `if` condition




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