Internal Hive
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Explain the structure of Apache Hive.
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Internal Hive
- 1. Inside Hive (for beginners) 1 Takeshi NAKANO / Recruit Co. Ltd.
- 2. Why? Hive is good tool for non-specialist! The number of M/R controls the Hive processing time. ↓ How can we reduce the number? What can we do for this on writing HiveQL? ↓ How does Hive convert HiveQLto M/R jobs? On this, what optimizing processes are adopted? 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 2
- 3. Don’t you have.. This fb’s paper has a lot of information! But this is a little old.. 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 3
- 4. Component Level Analysis 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 4
- 5. Hive Architecture / Exec Flow 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 5 Client Hadoop Metastore Driver Compiler
- 6. Client Hadoop Driver Compiler Hive Workflow Hive has the operators which are minimum processing units. The process of each operator is done with HDFS operation or M/R jobs. The compiler converts HiveQL to the sets of operators. 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 6 Metastore
- 7. Hive Workflow Operators 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 7
- 8. Client Hadoop Metastore Driver Compiler Hive Workflow For M/R processing, Hiveuses ExecMaper and ExecReducer. On processing, we have 2 modes. Local processing mode Distributed processing mode 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 8
- 9. Client Hadoop Metastore Driver Compiler Hive Workflow On 1(Local mode)Hive fork the process with hadoop command.The plan.xml is made just on 1 and the single node processes this. On 2(Distributed mode).Hive send the process to exsistingJobTracker.The information is housed on DistributedCacheand processed on multi nodes. 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 9
- 10. Compiler : How to Process HiveQL 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 10 Client Hadoop Metastore Driver Compiler
- 11. “Plumbing” of HIVE compiler 7/6/2011 11 HIVE - A warehouse solution over Map Reduce Framework
- 12. “Plumbing” of HIVE compiler 7/6/2011 12 HIVE - A warehouse solution over Map Reduce Framework
- 13. Compiler Overview 13 Parser Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer
- 14. Compiler Overview 14 Hive QL Parser AST Semantic Analyzer QB Logical Plan Gen. Operator Tree Logical Optimizer Operator Tree Physical Plan Gen. Task Tree Physical Optimizer Task Tree
- 15. Parser Hive QL AST INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); Hive QL TOK_QUERY + TOK_FROM + TOK_JOIN + TOK_TABREF + TOK_TABNAME + "access_log_hbase" + a + TOK_TABREF + TOK_TABNAME + "product_hbase" + "p" + "=" + "." + TOK_TABLE_OR_COL + "a" + "access_log_hbase" + "." + TOK_TABLE_OR_COL + "p" + "prono“ AST + TOK_INSERT + TOK_DESTINATION + TOK_TAB + TOK_TABNAME + "access_log_temp2" + TOK_SELECT + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "user" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "prono" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "maker" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "price" Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser
- 16. Parser SQL AST INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); SQL TOK_QUERY + TOK_FROM + TOK_JOIN + TOK_TABREF + TOK_TABNAME + "access_log_hbase" + a + TOK_TABREF + TOK_TABNAME + "product_hbase" + "p" + "=" + "." + TOK_TABLE_OR_COL + "a" + "access_log_hbase" + "." + TOK_TABLE_OR_COL + "p" + "prono“ + TOK_INSERT + TOK_DESTINATION + TOK_TAB + TOK_TABNAME + "access_log_temp2" + TOK_SELECT + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "user" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "prono" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "maker" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "price" AST 1 2 3 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser
- 17. 17 Semantic Analyzer (1/2) AST QB + TOK_FROM + TOK_JOIN + TOK_TABREF + TOK_TABNAME + "access_log_hbase" + a + TOK_TABREF + TOK_TABNAME + "product_hbase" + "p" + "=" + "." + TOK_TABLE_OR_COL + "a" + "access_log_hbase" + "." + TOK_TABLE_OR_COL + "p" + "prono“ AST 1 QB MetaData AliasTo Table Info “a”=Table Info(“access_log_hbase”) “p”=Table Info(“product_hbase”) ParseInfo Join Node + TOK_JOIN + TOK_TABREF … + TOK_TABREF … + “=” … Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 17
- 18. 18 Semantic Analyzer (2/2) AST QB + TOK_DESTINATION + TOK_TAB + TOK_TABNAME + "access_log_temp2” AST 2 QB ParseInfo NameTo Destination Node + TOK_TAB + TOK_TABNAME +"access_log_temp2” Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 18 18
- 19. 19 Semantic Analyzer (2/2) AST QB + TOK_SELECT + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "user" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "prono" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "maker" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "price" AST QB ParseInfo 3 Name To Select Node + TOK_SELECT + TOK_SELEXPR … + TOK_SELEXPR … + TOK_SELEXPR … + TOK_SELEXPR … Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 19 19
- 20. 20 Logical Plan Generator (1/4) QB OP Tree QB MetaData AliasTo Table Info “a”=Table Info(“access_log_hbase”) “p”=Table Info(“product_hbase”) OP Tree TableScanOperator(“access_log_hbase”) TableScanOperator(“product_hbase”) Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 20 20
- 21. 21 Logical Plan Generator (2/4) QB OP Tree QB ParseInfo + TOK_JOIN + TOK_TABREF + TOK_TABNAME + "access_log_hbase" + a + TOK_TABREF + TOK_TABNAME + "product_hbase" + "p" + "=" + "." + TOK_TABLE_OR_COL + "a" + "access_log_hbase" + "." + TOK_TABLE_OR_COL + "p" + "prono“ ReduceSinkOperator(“access_log_hbase”) ReduceSinkOperator(“product_hbase”) OP Tree JoinOperator Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser
- 22. 22 Logical Plan Generator (3/4) QB OP Tree QB ParseInfo Name To Select Node + TOK_SELECT + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "user" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "a" + "prono" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "maker" + TOK_SELEXPR + "." + TOK_TABLE_OR_COL + "p" + "price" OP Tree SelectOperator Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser
- 23. 23 Logical Plan Generator (4/4) QB OP Tree QB MetaData Name To Destination Table Info “insclause-0”= Table Info(“access_log_temp2”) OP Tree FileSinkOperator Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser
- 24. Logical Plan Generator (result) 24 LCF OP Tree TableScanOperator TS_1 TableScanOperator TS_0 ReduceSinkOperator RS_2 ReduceSinkOperator RS_3 JoinOperator JOIN_4 SelectOperator SEL_5 FileSinkOperator FS_6 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser
- 25. Logical Optimizer Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 25 25 25
- 26. Logical Optimizer (Predicate Push Down) INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono) WHERE p.maker = 'honda'; Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 26 26
- 27. Logical Optimizer (Predicate Push Down) TableScanOperator TS_1 TableScanOperator TS_0 INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); ReduceSinkOperator RS_3 ReduceSinkOperator RS_2 JoinOperator JOIN_4 INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono) WHERE p.maker = 'honda'; SelectOperator SEL_6 FileSinkOperator FS_7 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 27 27
- 28. INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono) WHERE p.maker = 'honda'; Logical Optimizer (Predicate Push Down) TableScanOperator TS_1 TableScanOperator TS_0 ReduceSinkOperator RS_3 ReduceSinkOperator RS_2 JoinOperator JOIN_4 FilterOperator FIL_5 (_col8 = 'honda') SelectOperator SEL_6 FileSinkOperator FS_7 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 28 28
- 29. Logical Optimizer (Predicate Push Down) TableScanOperator TS_1 TableScanOperator TS_0 INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); FilterOperator FIL_8 (maker = 'honda') ReduceSinkOperator RS_2 ReduceSinkOperator RS_3 JoinOperator JOIN_4 INSERT OVERWRITE TABLE access_log_temp2 SELECT a.user, a.prono, p.maker, p.price FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono) WHERE p.maker = 'honda'; FilterOperator FIL_5 (_col8 = 'honda') SelectOperator SEL_6 FileSinkOperator FS_7 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 29 29
- 30. 30 Physical Plan Generator OP Tree Task Tree MoveTask(Stage-0) Ope Tree LoadTableDesc TableScanOperator(TS_0) TableScanOperator(TS_1) ReduceSinkOperator(RS_2) MapRedTask(Stage-1/root) ReduceSinkOperator(RS_3) JoinOperator(JOIN_4) SelectOperator(SEL_5) FileSinkOperator(FS_6) StatsTask(Stage-2) Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 30 30
- 31. OP Tree Task Tree MapRedTask (Stage-1/root) TableScanOperator(TS_0) Physical Plan Generator (result) 31 LCF Mapper TableScanOperator TS_1 TableScanOperator TS_0 TableScanOperator(TS_1) ReduceSinkOperator RS_2 ReduceSinkOperator RS_3 ReduceSinkOperator(RS_2) MapRedTask(Stage-1/root) ReduceSinkOperator(RS_3) Reducer JoinOperator JOIN_4 JoinOperator(JOIN_4) SelectOperator SEL_5 SelectOperator(SEL_5) FileSinkOperator FS_6 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 31 31 31
- 32. 32 Physical Optimizer Task Tree Task Tree java/org/apache/hadoop/hive/ql/optimizer/physical/以下 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser
- 33. 33 Physical Optimizer (MapJoinResolver) Task Tree Task Tree MapRedTask (Stage-1) Mapper TableScanOperator TS_1 TableScanOperator TS_0 MapJoinOperator MAPJOIN_7 SelectOperator SEL_8 SelectOperator SEL_5 FileSinkOperator FS_6 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 33
- 34. 34 Physical Optimizer (MapJoinResolver) Task Tree Task Tree MapredLocalTask(Stage-7) MapRedTask (Stage-1) TableScanOperator TS_0 Mapper TableScanOperator TS_1 TableScanOperator TS_0 HashTableSinkOperator HASHTABLESINK_11 MapJoinOperator MAPJOIN_7 MapRedTask (Stage-1) SelectOperator SEL_8 Mapper TableScanOperator TS_1 SelectOperator SEL_5 MapJoinOperator MAPJOIN_7 FileSinkOperator FS_6 SelectOperator SEL_8 SelectOperator SEL_5 FileSinkOperator FS_6 Semantic Analyzer Logical Plan Gen. Logical Optimizer Physical Plan Gen. Physical Optimizer Parser 34
- 35. In the end 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 35 Client Hadoop Metastore Driver Compiler
- 36. In the end 36 Hive QL Parser AST Semantic Analyzer QB Logical Plan Gen. Operator Tree Logical Optimizer Operator Tree Physical Plan Gen. Task Tree Physical Optimizer Task Tree
- 37. End 7/6/2011 37
- 38. Appendix: What does Explain show? 7/6/2011 HIVE - A warehouse solution over Map Reduce Framework 38
- 39. Appendix: What does Explain show? hive> explain INSERT OVERWRITE TABLE access_log_temp2 > SELECT a.user, a.prono, p.maker, p.price > FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); OK ABSTRACT SYNTAX TREE: (TOK_QUERY (TOK_FROM (TOK_JOIN (TOK_TABREF (TOK_TABNAME access_log_hbase) a) (TOK_TABREF (TOK_TABNAME product_hbase) p) (= (. (TOK_TABLE_OR_COL a) prono) (. (TOK_TABLE_OR_COL p) prono)))) (TOK_INSERT (TOK_DESTINATION (TOK_TAB (TOK_TABNAME access_log_temp2))) (TOK_SELECT (TOK_SELEXPR (. (TOK_TABLE_OR_COL a) user)) (TOK_SELEXPR (. (TOK_TABLE_OR_COL a) prono)) (TOK_SELEXPR (. (TOK_TABLE_OR_COL p) maker)) (TOK_SELEXPR (. (TOK_TABLE_OR_COL p) price))))) STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 Stage-2 depends on stages: Stage-0 STAGE PLANS: Stage: Stage-1 Map Reduce Alias -> Map Operator Tree: a TableScan alias: a Reduce Output Operator key expressions: expr: prono type: int sort order: + Map-reduce partition columns: expr: prono type: int tag: 0 value expressions: expr: user type: string expr: prono type: int p TableScan alias: p Reduce Output Operator key expressions: expr: prono type: int sort order: + Map-reduce partition columns: expr: prono type: int tag: 1 value expressions: expr: maker type: string expr: price type: int Reduce Operator Tree: Join Operator condition map: Inner Join 0 to 1 condition expressions: 0 {VALUE._col0} {VALUE._col2} 1 {VALUE._col1} {VALUE._col2} handleSkewJoin: false outputColumnNames: _col0, _col2, _col6, _col7 Select Operator expressions: expr: _col0 type: string expr: _col2 type: int expr: _col6 type: string expr: _col7 type: int outputColumnNames: _col0, _col1, _col2, _col3 File Output Operator compressed: false GlobalTableId: 1 table: input format: org.apache.hadoop.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe name: default.access_log_temp2 Stage: Stage-0 Move Operator tables: replace: true table: input format: org.apache.hadoop.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe name: default.access_log_temp2 Stage: Stage-2 Stats-Aggr Operator Time taken: 0.1 seconds hive>
- 40. Appendix: What does Explain show? hive> explain INSERT OVERWRITE TABLE access_log_temp2 > SELECT a.user, a.prono, p.maker, p.price > FROM access_log_hbase a JOIN product_hbase p ON (a.prono = p.prono); OK ABSTRACT SYNTAX TREE: (TOK_QUERY (TOK_FROM (TOK_JOIN (TOK_TABREF (TOK_TABNAME access_log_hbase) a) (TOK_TABREF (TOK_TABNAME product_hbase) p) (= (. (TOK_TABLE_OR_COL a) prono) (. (TOK_TABLE_OR_COL p) prono)))) (TOK_INSERT (TOK_DESTINATION (TOK_TAB (TOK_TABNAME access_log_temp2))) (TOK_SELECT (TOK_SELEXPR (. (TOK_TABLE_OR_COL a) user)) (TOK_SELEXPR (. (TOK_TABLE_OR_COL a) prono)) (TOK_SELEXPR (. (TOK_TABLE_OR_COL p) maker)) (TOK_SELEXPR (. (TOK_TABLE_OR_COL p) price))))) STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 Stage-2 depends on stages: Stage-0 STAGE PLANS: Stage: Stage-1 Map Reduce Alias -> Map Operator Tree: a TableScan alias: a Reduce Output Operator key expressions: expr: prono type: int sort order: + Map-reduce partition columns: expr: prono type: int tag: 0 value expressions: expr: user type: string expr: prono type: int p TableScan alias: p Reduce Output Operator key expressions: expr: prono type: int sort order: + Map-reduce partition columns: expr: prono type: int tag: 1 value expressions: expr: maker type: string expr: price type: int ABSTRACT SYNTAX TREE: STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 Stage-2 depends on stages: Stage-0 STAGE PLANS: Stage: Stage-1 Map Reduce Map Operator Tree: TableScan Reduce Output Operator TableScan Reduce Output Operator Reduce Operator Tree: Join Operator Select Operator File Output Operator Stage: Stage-0 Move Operator Stage: Stage-2 Stats-Aggr Operator Reduce Operator Tree: Join Operator condition map: Inner Join 0 to 1 condition expressions: 0 {VALUE._col0} {VALUE._col2} 1 {VALUE._col1} {VALUE._col2} handleSkewJoin: false outputColumnNames: _col0, _col2, _col6, _col7 Select Operator expressions: expr: _col0 type: string expr: _col2 type: int expr: _col6 type: string expr: _col7 type: int outputColumnNames: _col0, _col1, _col2, _col3 File Output Operator compressed: false GlobalTableId: 1 table: input format: org.apache.hadoop.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe name: default.access_log_temp2 Stage: Stage-0 Move Operator tables: replace: true table: input format: org.apache.hadoop.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe name: default.access_log_temp2 Stage: Stage-2 Stats-Aggr Operator Time taken: 0.1 seconds hive>
- 41. Appendix: What does Explain show? ABSTRACT SYNTAX TREE: STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1 Stage-2 depends on stages: Stage-0 STAGE PLANS: Stage: Stage-1 Map Reduce Map Operator Tree: TableScan Reduce Output Operator TableScan Reduce Output Operator Reduce Operator Tree: Join Operator Select Operator File Output Operator Stage: Stage-0 Move Operator Stage: Stage-2 Stats-Aggr Operator MapRedTask (Stage-1/root) Mapper TableScanOperator TS_1 TableScanOperator TS_0 ReduceSinkOperator RS_2 ReduceSinkOperator RS_3 Reducer JoinOperator JOIN_4 ≒ SelectOperator SEL_5 FileSinkOperator FS_6 MoveTask (Stage-0) Stats Task (Stage-2)