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[HIVE-19668] Over 30% of the heap wasted by duplicate org.antlr.runtime.CommonToken's and duplicate strings - Hive - [issue]
...I've recently analyzed a HS2 heap dump, obtained when there was a huge memory spike during compilation of some big query. The analysis was done with jxray (www.jxray.com). It turns out that ...
http://issues.apache.org/jira/browse/HIVE-19668    Author: Misha Dmitriev , 2018-07-16, 23:42
[HIVE-16079] HS2: high memory pressure due to duplicate Properties objects - Hive - [issue]
...I've created a Hive table with 2000 partitions, each backed by two files, with one row in each file. When I execute some number of concurrent queries against this table, e.g. as followsfor i...
http://issues.apache.org/jira/browse/HIVE-16079    Author: Misha Dmitriev , 2018-05-22, 23:59
[HIVE-17237] HMS wastes 26.4% of memory due to dup strings in metastore.api.Partition.parameters - Hive - [issue]
...I've analyzed a heap dump from a production Hive installation using jxray (www.jxray.com) It turns out that there are a lot of duplicate strings in memory, that waste 26.4% of the heap. Most...
http://issues.apache.org/jira/browse/HIVE-17237    Author: Misha Dmitriev , 2018-05-22, 23:57
[HIVE-16489] HMS wastes 26.4% of memory due to dup strings in metastore.api.Partition.parameters - Hive - [issue]
...I've just analyzed an HMS heap dump. It turns out that it contains a lot of duplicate strings, that waste 26.4% of the heap. Most of them come from HashMaps referenced by org.apache.hadoop.h...
http://issues.apache.org/jira/browse/HIVE-16489    Author: Misha Dmitriev , 2018-01-08, 09:11
[HIVE-15882] HS2 generating high memory pressure with many partitions and concurrent queries - Hive - [issue]
...I've created a Hive table with 2000 partitions, each backed by two files, with one row in each file. When I execute some number of concurrent queries against this table, e.g. as followsfor i...
http://issues.apache.org/jira/browse/HIVE-15882    Author: Misha Dmitriev , 2017-10-11, 13:31
[HIVE-16166] HS2 may still waste up to 15% of memory on duplicate strings - Hive - [issue]
...A heap dump obtained from one of our users shows that 15% of memory is wasted on duplicate strings, despite the recent optimizations that I made. The problematic strings just come from diffe...
http://issues.apache.org/jira/browse/HIVE-16166    Author: Misha Dmitriev , 2017-10-11, 13:31