chenxu14 commented on a change in pull request #919: HBASE-23066 Allow cache on 
write during compactions when prefetching is
URL: https://github.com/apache/hbase/pull/919#discussion_r355974362
 
 

 ##########
 File path: 
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
 ##########
 @@ -1118,9 +1118,9 @@ public StoreFileWriter createWriterInTmp(long 
maxKeyCount, Compression.Algorithm
       boolean shouldDropBehind) throws IOException {
     final CacheConfig writerCacheConf;
     if (isCompaction) {
-      // Don't cache data on write on compactions.
+      // Don't cache data on write on compactions, unless specifically 
configured to do so
       writerCacheConf = new CacheConfig(cacheConf);
-      writerCacheConf.setCacheDataOnWrite(false);
+      
writerCacheConf.setCacheDataOnWrite(cacheConf.shouldCacheCompactedBlocksOnWrite());
 
 Review comment:
   OK, looking forward to

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