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Review request for hive, Jesús Camacho Rodríguez, Zoltan Haindrich, and Vineet Garg. Bugs: HIVE-21948 https://issues.apache.org/jira/browse/HIVE-21948 Repository: hive-git Description ------- Implement parallel processing in Pre Upgrade Tool ================================================= Process databases and tables paralelly using a thread pool for each. Thread pools size can be defined by command line options. If no options are given the default pool size is the number of cpu cores / 2 Diffs ----- upgrade-acid/pre-upgrade/src/main/java/org/apache/hadoop/hive/upgrade/acid/CloseableThreadLocal.java PRE-CREATION upgrade-acid/pre-upgrade/src/main/java/org/apache/hadoop/hive/upgrade/acid/CompactTablesState.java PRE-CREATION upgrade-acid/pre-upgrade/src/main/java/org/apache/hadoop/hive/upgrade/acid/CompactionMetaInfo.java PRE-CREATION upgrade-acid/pre-upgrade/src/main/java/org/apache/hadoop/hive/upgrade/acid/NamedForkJoinWorkerThreadFactory.java PRE-CREATION upgrade-acid/pre-upgrade/src/main/java/org/apache/hadoop/hive/upgrade/acid/PreUpgradeTool.java 0a7354d12b upgrade-acid/pre-upgrade/src/main/java/org/apache/hadoop/hive/upgrade/acid/RunOptions.java 66213d424c upgrade-acid/pre-upgrade/src/test/java/org/apache/hadoop/hive/upgrade/acid/TestCloseableThreadLocal.java PRE-CREATION upgrade-acid/pre-upgrade/src/test/java/org/apache/hadoop/hive/upgrade/acid/TestRunOptions.java PRE-CREATION Diff: https://reviews.apache.org/r/71045/diff/1/ Testing ------- TestPreUpgradeTool UT passed. Manually: 1. deploy ambari and HDP 2.6.5 cluster. 2. create some hive tables and insert/update values 3. run PreUpgradeTool and check logs and output script Thanks, Krisztian Kasa