Les traductions sont fournies par des outils de traduction automatique. En cas de conflit entre le contenu d'une traduction et celui de la version originale en anglais, la version anglaise prévaudra.
Utilisez l'EXPLAINinstruction Spark pour résoudre les problèmes liés à Spark SQL
Vous pouvez utiliser l'EXPLAINinstruction Spark avec Spark SQL pour résoudre les problèmes liés à votre code Spark. Les exemples de code et de résultats suivants illustrent cette utilisation.
Exemple — SELECT Déclaration Spark
spark.sql("select * from select_taxi_table").explain(True)
Sortie
Calculation started (calculation_id=20c1ebd0-1ccf-ef14-db35-7c1844876a7e) in
(session=24c1ebcb-57a8-861e-1023-736f5ae55386).
Checking calculation status...
Calculation completed.
== Parsed Logical Plan ==
'Project [*]
+- 'UnresolvedRelation [select_taxi_table], [], false
== Analyzed Logical Plan ==
VendorID: bigint, passenger_count: bigint, count: bigint
Project [VendorID#202L, passenger_count#203L, count#204L]
+- SubqueryAlias spark_catalog.spark_demo_database.select_taxi_table
+- Relation spark_demo_database.select_taxi_table[VendorID#202L,
passenger_count#203L,count#204L] csv
== Optimized Logical Plan ==
Relation spark_demo_database.select_taxi_table[VendorID#202L,
passenger_count#203L,count#204L] csv
== Physical Plan ==
FileScan csv spark_demo_database.select_taxi_table[VendorID#202L,
passenger_count#203L,count#204L]
Batched: false, DataFilters: [], Format: CSV,
Location: InMemoryFileIndex(1 paths)
[s3://amzn-s3-demo-bucket/select_taxi],
PartitionFilters: [], PushedFilters: [],
ReadSchema: struct<VendorID:bigint,passenger_count:bigint,count:bigint>Exemple – Bloc de données Spark
L'exemple suivant illustre comment utiliser EXPLAIN avec un bloc de données Spark.
taxi1_df=taxi_df.groupBy("VendorID", "passenger_count").count() taxi1_df.explain("extended")
Sortie
Calculation started (calculation_id=d2c1ebd1-f9f0-db25-8477-3effc001b309) in
(session=24c1ebcb-57a8-861e-1023-736f5ae55386).
Checking calculation status...
Calculation completed.
== Parsed Logical Plan ==
'Aggregate ['VendorID, 'passenger_count],
['VendorID, 'passenger_count, count(1) AS count#321L]
+- Relation [VendorID#49L,tpep_pickup_datetime#50,tpep_dropoff_datetime#51,
passenger_count#52L,trip_distance#53,RatecodeID#54L,store_and_fwd_flag#55,
PULocationID#56L,DOLocationID#57L,payment_type#58L,fare_amount#59,
extra#60,mta_tax#61,tip_amount#62,tolls_amount#63,improvement_surcharge#64,
total_amount#65,congestion_surcharge#66,airport_fee#67] parquet
== Analyzed Logical Plan ==
VendorID: bigint, passenger_count: bigint, count: bigint
Aggregate [VendorID#49L, passenger_count#52L],
[VendorID#49L, passenger_count#52L, count(1) AS count#321L]
+- Relation [VendorID#49L,tpep_pickup_datetime#50,tpep_dropoff_datetime#51,
passenger_count#52L,trip_distance#53,RatecodeID#54L,store_and_fwd_flag#55,
PULocationID#56L,DOLocationID#57L,payment_type#58L,fare_amount#59,extra#60,
mta_tax#61,tip_amount#62,tolls_amount#63,improvement_surcharge#64,
total_amount#65,congestion_surcharge#66,airport_fee#67] parquet
== Optimized Logical Plan ==
Aggregate [VendorID#49L, passenger_count#52L],
[VendorID#49L, passenger_count#52L, count(1) AS count#321L]
+- Project [VendorID#49L, passenger_count#52L]
+- Relation [VendorID#49L,tpep_pickup_datetime#50,tpep_dropoff_datetime#51,
passenger_count#52L,trip_distance#53,RatecodeID#54L,store_and_fwd_flag#55,
PULocationID#56L,DOLocationID#57L,payment_type#58L,fare_amount#59,extra#60,
mta_tax#61,tip_amount#62,tolls_amount#63,improvement_surcharge#64,
total_amount#65,congestion_surcharge#66,airport_fee#67] parquet
== Physical Plan ==
AdaptiveSparkPlan isFinalPlan=false
+- HashAggregate(keys=[VendorID#49L, passenger_count#52L], functions=[count(1)],
output=[VendorID#49L, passenger_count#52L, count#321L])
+- Exchange hashpartitioning(VendorID#49L, passenger_count#52L, 1000),
ENSURE_REQUIREMENTS, [id=#531]
+- HashAggregate(keys=[VendorID#49L, passenger_count#52L],
functions=[partial_count(1)], output=[VendorID#49L,
passenger_count#52L, count#326L])
+- FileScan parquet [VendorID#49L,passenger_count#52L] Batched: true,
DataFilters: [], Format: Parquet,
Location: InMemoryFileIndex(1 paths)[s3://amzn-s3-demo-bucket/
notebooks/yellow_tripdata_2016-01.parquet], PartitionFilters: [],
PushedFilters: [],
ReadSchema: struct<VendorID:bigint,passenger_count:bigint>