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https://issues.apache.org/jira/browse/HIVE-23468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ashutosh Chauhan updated HIVE-23468:
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Status: Open (was: Patch Available)
> 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
> Assignee: Rajesh Balamohan
> Priority: Minor
> Attachments: HIVE-23468.1.patch, HIVE-23468.2.patch,
> HIVE-23468.3.patch, HIVE-23468.4.patch, HIVE-23468.5.patch,
> HIVE-23468.6.patch, HIVE-23468.7.patch, HIVE-23468.8.patch, HIVE-23468.9.patch
>
>
> 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.
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