wchevreuil commented on code in PR #8128:
URL: https://github.com/apache/hbase/pull/8128#discussion_r3160611732


##########
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/DataTieringManager.java:
##########
@@ -347,4 +387,29 @@ private static boolean 
isDataTieringFeatureEnabled(Configuration conf) {
   public static void resetForTestingOnly() {
     instance = null;
   }
+
+  public Map<String, Pair<List<String>, Long>> getRegionColdDataSize() {
+    return regionColdDataSize;
+  }
+
+  /**
+   * Updates regionColdData size for the region containing the passed 
compactedFiles.
+   */
+  public void updateRegionColdDataSize(String encodedRegionName,
+    Collection<HStoreFile> compactedFiles, Collection<HStoreFile> newFiles) {
+    regionColdDataSize.computeIfPresent(encodedRegionName, (k, v) -> {
+      for (HStoreFile file : compactedFiles) {
+        if (v.getFirst().contains(file.getPath().getName())) {
+          v.getFirst().remove(file.getPath().getName());
+          v.setSecond(v.getSecond() - 
Bytes.toLong(file.getMetadataValue(FILE_SIZE)));
+        }
+      }
+      for (HStoreFile file : newFiles) {
+        // call isHotData to account for the new file size in 
regionColdDataSize, if the new file is
+        // considered cold data as per data-tiering logic.
+        isHotData(file.getFileInfo().getHFileInfo(), 
file.getFileInfo().getConf());

Review Comment:
   You mean, if another thread is calling isHotData? I don't think it would, 
which ever reaches the regionColdDataSize atomic methods first would own the 
lock and block the other, right?



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