jhungund commented on code in PR #5866:
URL: https://github.com/apache/hbase/pull/5866#discussion_r1594207856


##########
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileWriterImpl.java:
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@@ -555,16 +563,33 @@ private void writeInlineBlocks(boolean closing) throws 
IOException {
   private void doCacheOnWrite(long offset) {
     cacheConf.getBlockCache().ifPresent(cache -> {
       HFileBlock cacheFormatBlock = blockWriter.getBlockForCaching(cacheConf);
+      BlockCacheKey key = buildBlockCacheKey(offset, cacheFormatBlock);
+      if (!shouldCacheBlock(cache, key)) {

Review Comment:
   All we need is the hot-data-age now. the max timestamp is already present 
now. If we make the hot-data-age available to shouldCacheBlock, the round trips 
to get the config, can be avoided within DataTieringManager.



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