Rajesh Balamohan created HIVE-23468: ---------------------------------------
Summary: LLAP: Optimise OrcEncodedDataReader to avoid FS init to NN Key: HIVE-23468 URL: https://issues.apache.org/jira/browse/HIVE-23468 Project: Hive Issue Type: Improvement Reporter: Rajesh Balamohan OrcEncodedDataReader materializes the supplier<fs> to check if it is a HDFS system or not. This causes unwanted call to NN even in cases when cache is completely warmed up. [https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/io/encoded/OrcEncodedDataReader.java#L540] [https://github.com/apache/hive/blob/9f40d7cc1d889aa3079f3f494cf810fabe326e44/ql/src/java/org/apache/hadoop/hive/ql/io/HdfsUtils.java#L107] Workaround is to set "hive.llap.io.use.fileid.path=false" to avoid this case. IO elevator could get 100% cache hit from FileSystem impl in warmed up scenario. -- This message was sent by Atlassian Jira (v8.3.4#803005)