CarbonData: Spark Integration And Carbon Query Flow
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1 CarbonData: Spark Integration And Carbon Query Flow
2 SparkSQL + CarbonData: 2
3 Carbon-Spark Integration Built-in Spark integration Spark 1.5, 1.6, 2.1 Interface SQL DataFrame API Integration: Format Query Optimization & Data Management Data Management Reader/Writer Query Optimization Carbon Carbon Carbon 3
4 Integration with MR InputFormat Carbon Carbon Carbon HDFS Segment 3 Segment 2 Segment 1 4
5 Deep Integration with Spark CarbonData Table Read/Write/Update/Delete Spark Driver Spark Driver Carbon Carbon Carbon HDFS Segment 3 Segment 2 Segment 1 5
6 CarbonData as a SparkSQL Data Source SparkSQL Catalyst Framework Spark Core SQL or DataFrame Parser/Analyzer Optimizer Physical Planning Execution Parser Rule-based Strategy RDD Resolve Relation Cost-based Carbon Data Source New SQL syntax DML related statement Carbon-specific optimization rule: Lazy Decode leveraging global dictionary CarbonScanRDD: Leveraging multi level index for efficient filtering and scan DML related RDDs 6
7 Query Flow Diagram 7
8 Query Sequence Diagram 8
9 Efficient Filtering via Index SELECT c3, c4 FROM t1 WHERE c2= boston Spark Driver 1. pruning 3. Read and decompress filter column 4. Binary search using inverted index, skip to next blocklet if no matching Spark Executor Task Task 2. pruning C1 C2 C3 C4 Cn HDFS Footer Footer Footer Footer 5. Decompress projection column 6. Return decoded data to spark 9
10 Lazy Decoding by Leveraging Global Dictionary SELECT c1, sum(c2) FROM t1 WHERE c3>10 group by c1 Stage 2 Original plan Stage 2 Optimized plan Dictionary Decode Decode c1 in last stage Stage 1 Aggregation Stage 1 Aggregation Groupby on encoded value of c1 Filter Filter Scan (decode c1, c2, c3) Scan (decode c2, c3 only) 10
11 Query Package And Interface Query RDD org.apache.carbondata.spark.rdd.carbonscanrdd-query execution rdd Query Executor Interface org.apache.carbondata.core.scan.executor.queryexecutor- Carbon query interface org.apache.carbondata.core.scan.result.iterator.abstractdetailqueryresultiterator- Internal query interface, execute the query return the iterator over query result Scanner Interface org.apache.carbondata.core.scan.processor.abstractdatablockiterator- iterator to process the blocklet 11
12 Query Package And Interface Scanner Interface org.apache.carbondata.core.scan.scanner.scanner- Interface for scanning the blocklet, there are two type of scanner non filter scanner and filter scanner. org.apache.carbondata.core.scan.filter.executer.filterexecuter -Interface for executing the filter in executor side org.apache.carbondata.core.scan.collector.scannedresultcollector - Prepares the query results from scanned result Reader Interface org.apache.carbondata.core.datastore.chunk.reader.dimensioncolumnchunkreader- Reader interface for reading and uncompressing the blocklet dimension column data. Reader returns the store instance based on column type 12
13 Query Package And Interface Reader Interface org.apache.carbondata.core.datastore.chunk.reader.measurecolumnchunkreader- Reader interface for reading and uncompressing the blocklet measure column data. Reader returns the store instance based on column data type Query Data Store Interface org.apache.carbondata.core.datastore.chunk.store.dimensiondatachunkstore- Interface for storing the uncompressed dimension column data during query org.apache.carbondata.core.datastore.chunk.store. MeasureDataChunkStore- Interface for storing the uncompressed measure column data during query 13
14 Query Package And Interface Dictionary Decoder org.apache.spark.sql.carbondictionarydecoder- Decodes the dictionary values to actual data 14
15 Thank you
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