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Overal, looks good, just a few minor comments. common/src/java/org/apache/hadoop/hive/common/StringInternUtils.java (line 29) <https://reviews.apache.org/r/56687/#comment238252> How will this class relate to the intern utils provided in `HiveStringUtils`? common/src/java/org/apache/hadoop/hive/common/StringInternUtils.java (line 87) <https://reviews.apache.org/r/56687/#comment238231> Add check to see if path is null ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/GenMRSkewJoinProcessor.java (line 394) <https://reviews.apache.org/r/56687/#comment238251> Did the changes to the skew join come up when running the `count()` queries? Or did you notice that this code could benefit from interning and decide to update it. - Sahil Takiar On Feb. 14, 2017, 11:03 p.m., Misha Dmitriev wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://reviews.apache.org/r/56687/ > ----------------------------------------------------------- > > (Updated Feb. 14, 2017, 11:03 p.m.) > > > Review request for hive, Chaoyu Tang, Mohit Sabharwal, and Sergio Pena. > > > Bugs: https://issues.apache.org/jira/browse/HIVE-15882 > > https://issues.apache.org/jira/browse/https://issues.apache.org/jira/browse/HIVE-15882 > > > Repository: hive-git > > > Description > ------- > > See the description of the problem in > https://issues.apache.org/jira/browse/HIVE-15882 Interning strings per this > review removes most of the overhead due to duplicate strings. > > Also, where maps in several places are created from other maps, use the > original map's size for the new map. This is to avoid the situation when a > map with default capacity (typically 16) is created to hold just 2-3 entries, > and the rest of the internal 16-entry array is wasted. > > > Diffs > ----- > > common/src/java/org/apache/hadoop/hive/common/StringInternUtils.java > PRE-CREATION > ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java > e81cbce3e333d44a4088c10491f399e92a505293 > ql/src/java/org/apache/hadoop/hive/ql/hooks/Entity.java > 08420664d59f28f75872c25c9f8ee42577b23451 > ql/src/java/org/apache/hadoop/hive/ql/io/CombineHiveInputFormat.java > e91064b9c75e8adb2b36f21ff19ec0c1539b03b9 > ql/src/java/org/apache/hadoop/hive/ql/io/HiveInputFormat.java > 51530ac16c92cc75d501bfcb573557754ba0c964 > ql/src/java/org/apache/hadoop/hive/ql/io/SymbolicInputFormat.java > 55b3b551a1dac92583b6e03b10beb8172ca93d45 > ql/src/java/org/apache/hadoop/hive/ql/lockmgr/HiveLockObject.java > 82dc89803be9cf9e0018720eeceb90ff450bfdc8 > ql/src/java/org/apache/hadoop/hive/ql/metadata/Partition.java > c0edde9e92314d86482b5c46178987e79fae57fe > ql/src/java/org/apache/hadoop/hive/ql/metadata/Table.java > c6ae6f290857cfd10f1023058ede99bf4a10f057 > ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMapRedUtils.java > 24d16812515bdfa90b4be7a295c0388fcdfe95ef > > ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/GenMRSkewJoinProcessor.java > ede4fcbe342052ad86dadebcc49da2c0f515ea98 > > ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/NullScanTaskDispatcher.java > 0882ae2c6205b1636cbc92e76ef66bb70faadc76 > > ql/src/java/org/apache/hadoop/hive/ql/plan/ConditionalResolverMergeFiles.java > 68b0ad9ea63f051f16fec3652d8525f7ab07eb3f > ql/src/java/org/apache/hadoop/hive/ql/plan/MapWork.java > d4bdd96eaf8d179bed43b8a8c3be0d338940154a > ql/src/java/org/apache/hadoop/hive/ql/plan/MsckDesc.java > b7a7e4b7a5f8941b080c7805d224d3885885f444 > ql/src/java/org/apache/hadoop/hive/ql/plan/PartitionDesc.java > 73981e826870139a42ad881103fdb0a2ef8433a2 > > Diff: https://reviews.apache.org/r/56687/diff/ > > > Testing > ------- > > > Thanks, > > Misha Dmitriev > >