szlta commented on a change in pull request #1251:
URL: https://github.com/apache/hive/pull/1251#discussion_r454390429



##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/io/orc/VectorizedOrcAcidRowBatchReader.java
##########
@@ -232,6 +250,17 @@ private VectorizedOrcAcidRowBatchReader(JobConf conf, 
OrcSplit orcSplit, Reporte
 
     this.syntheticProps = orcSplit.getSyntheticAcidProps();
 
+    if (LlapHiveUtils.isLlapMode(conf) && LlapProxy.isDaemon()
+            && HiveConf.getBoolVar(conf, ConfVars.LLAP_TRACK_CACHE_USAGE))
+    {
+      MapWork mapWork = LlapHiveUtils.findMapWork(conf);

Review comment:
       We could spare the deserialization of MapWork from JobConf here, if we 
pass the MapWork instance already present in LlapRecordReader to 
VectorizedOrcAcidRowBatchReader ctor. (Downside is that in turn we would need 
to adjust the other ctor's of VectorizedOrcAcidRowBatchReader too)




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