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6c12546561
Before this change, the per-host reservation size was computed by the Planner. However, scheduling happens after planning, so the Planner must assume that all fragments run on all hosts, and the reservation size is likely much larger than it needs to be. This moves the computation of the per-host reservation size to the BE where it can be computed more precisely. This also includes a number of plan/profile changes. Change-Id: Idbcd1e9b1be14edc4017b4907e83f9d56059fbac Reviewed-on: http://gerrit.cloudera.org:8080/7630 Reviewed-by: Matthew Jacobs <mj@cloudera.com> Tested-by: Impala Public Jenkins
158 lines
4.9 KiB
Plaintext
158 lines
4.9 KiB
Plaintext
====
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---- QUERY
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create table alltypes like functional_parquet.alltypes;
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insert into alltypes partition(year, month)
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select * from functional_parquet.alltypes where year = 2009;
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====
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---- QUERY
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# No stats are available.
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_SUBSET
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' stats-rows=unavailable extrapolated-rows=unavailable'
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' table stats: rows=unavailable size=unavailable'
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' column stats: unavailable'
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' mem-estimate=16.00MB mem-reservation=0B'
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' tuple-ids=0 row-size=4B cardinality=unavailable'
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---- TYPES
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STRING
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====
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---- QUERY
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compute stats alltypes
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---- RESULTS
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'Updated 12 partition(s) and 11 column(s).'
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---- TYPES
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STRING
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====
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---- QUERY
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# Stats are available now.
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_EQUAL
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'Max Per-Host Resource Reservation: Memory=0B'
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'Per-Host Resource Estimates: Memory=16.00MB'
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'Codegen disabled by planner'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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'| Per-Host Resources: mem-estimate=16.00MB mem-reservation=0B'
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'PLAN-ROOT SINK'
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'| mem-estimate=0B mem-reservation=0B'
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'|'
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'00:SCAN HDFS [$DATABASE.alltypes]'
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row_regex:.*partitions=12/12 files=12 size=.*
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' stats-rows=3650 extrapolated-rows=3650'
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row_regex:.*table stats: rows=3650 size=.*
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' column stats: all'
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' mem-estimate=16.00MB mem-reservation=0B'
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' tuple-ids=0 row-size=4B cardinality=3650'
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---- TYPES
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STRING
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====
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---- QUERY
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# Select a subset of partitions.
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explain select id from alltypes where month in (1, 2, 3);
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---- RESULTS: VERIFY_IS_EQUAL
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'Max Per-Host Resource Reservation: Memory=0B'
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'Per-Host Resource Estimates: Memory=16.00MB'
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'Codegen disabled by planner'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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'| Per-Host Resources: mem-estimate=16.00MB mem-reservation=0B'
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'PLAN-ROOT SINK'
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'| mem-estimate=0B mem-reservation=0B'
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'|'
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'00:SCAN HDFS [$DATABASE.alltypes]'
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row_regex:.*partitions=3/12 files=3 size=.*
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' stats-rows=900 extrapolated-rows=904'
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row_regex:.*table stats: rows=3650 size=.*
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' column stats: all'
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' mem-estimate=16.00MB mem-reservation=0B'
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' tuple-ids=0 row-size=4B cardinality=904'
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---- TYPES
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STRING
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====
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---- QUERY
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# Double the data in existing partitions.
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insert into alltypes partition(year, month)
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select * from functional_parquet.alltypes where year = 2009;
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_EQUAL
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'Max Per-Host Resource Reservation: Memory=0B'
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'Per-Host Resource Estimates: Memory=16.00MB'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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'| Per-Host Resources: mem-estimate=16.00MB mem-reservation=0B'
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'PLAN-ROOT SINK'
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'| mem-estimate=0B mem-reservation=0B'
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'|'
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'00:SCAN HDFS [$DATABASE.alltypes]'
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row_regex:.*partitions=12/12 files=24 size=.*
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' stats-rows=3650 extrapolated-rows=7300'
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row_regex:.*table stats: rows=3650 size=.*
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' column stats: all'
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' mem-estimate=16.00MB mem-reservation=0B'
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' tuple-ids=0 row-size=4B cardinality=7300'
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---- TYPES
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STRING
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====
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---- QUERY
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# Create new partitions and extrapolate their row count.
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insert into alltypes partition(year, month)
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select * from functional_parquet.alltypes where year = 2010;
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explain select id from alltypes where year = 2010;
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---- RESULTS: VERIFY_IS_EQUAL
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'Max Per-Host Resource Reservation: Memory=0B'
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'Per-Host Resource Estimates: Memory=16.00MB'
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'Codegen disabled by planner'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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'| Per-Host Resources: mem-estimate=16.00MB mem-reservation=0B'
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'PLAN-ROOT SINK'
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'| mem-estimate=0B mem-reservation=0B'
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'|'
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'00:SCAN HDFS [$DATABASE.alltypes]'
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row_regex:.*partitions=12/24 files=12 size=.*
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' stats-rows=unavailable extrapolated-rows=3651'
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row_regex:.*table stats: rows=3650 size=.*
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' column stats: all'
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' mem-estimate=16.00MB mem-reservation=0B'
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' tuple-ids=0 row-size=4B cardinality=3651'
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---- TYPES
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STRING
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====
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---- QUERY
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# Compute stats and run the same query again.
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compute stats alltypes;
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explain select id from alltypes where year = 2010;
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---- RESULTS: VERIFY_IS_EQUAL
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'Max Per-Host Resource Reservation: Memory=0B'
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'Per-Host Resource Estimates: Memory=16.00MB'
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'Codegen disabled by planner'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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'| Per-Host Resources: mem-estimate=16.00MB mem-reservation=0B'
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'PLAN-ROOT SINK'
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'| mem-estimate=0B mem-reservation=0B'
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'|'
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'00:SCAN HDFS [$DATABASE.alltypes]'
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row_regex:.*partitions=12/24 files=12 size=.*
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' stats-rows=3650 extrapolated-rows=3651'
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row_regex:.*table stats: rows=10950 size=.*
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' column stats: all'
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' mem-estimate=16.00MB mem-reservation=0B'
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' tuple-ids=0 row-size=4B cardinality=3651'
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---- TYPES
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STRING
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====
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---- QUERY
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# Test that dropping stats resets everything.
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drop stats alltypes;
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_SUBSET
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' stats-rows=unavailable extrapolated-rows=unavailable'
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' table stats: rows=unavailable size=unavailable'
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' column stats: unavailable'
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' mem-estimate=16.00MB mem-reservation=0B'
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' tuple-ids=0 row-size=4B cardinality=unavailable'
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---- TYPES
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STRING
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====
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