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Posted to issues@drill.apache.org by "Rahul Challapalli (JIRA)" <ji...@apache.org> on 2015/10/21 19:12:27 UTC
[jira] [Commented] (DRILL-3937) We are not pruning when we have a
metadata cache and auto partitioned data in some cases
[ https://issues.apache.org/jira/browse/DRILL-3937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14967482#comment-14967482 ]
Rahul Challapalli commented on DRILL-3937:
------------------------------------------
This looks to be an issue with deserializing the metadata cache file when we have binary types in the data
> We are not pruning when we have a metadata cache and auto partitioned data in some cases
> ----------------------------------------------------------------------------------------
>
> Key: DRILL-3937
> URL: https://issues.apache.org/jira/browse/DRILL-3937
> Project: Apache Drill
> Issue Type: Bug
> Components: Metadata
> Reporter: Rahul Challapalli
> Attachments: 1_0_9998.parquet, 1_0_9999.parquet
>
>
> git.commit.id.abbrev=2736412
> The below plan indicates that we are not pruning
> {code}
> explain plan for select count(*) from dfs.`/drill/comscore/orders2` where o_clerk='Clerk#000079443';
> +------+------+
> | text | json |
> +------+------+
> | 00-00 Screen
> 00-01 Project(EXPR$0=[$0])
> 00-02 StreamAgg(group=[{}], EXPR$0=[COUNT()])
> 00-03 Project($f0=[0])
> 00-04 SelectionVectorRemover
> 00-05 Filter(condition=[=($0, 'Clerk#000079443')])
> 00-06 Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=maprfs:///drill/comscore/orders2/1_0_9999.parquet], ReadEntryWithPath [path=maprfs:///drill/comscore/orders2/1_0_9998.parquet]], selectionRoot=/drill/comscore/orders2, numFiles=2, usedMetadataFile=true, columns=[`o_clerk`]]])
> {code}
> Error from the logs
> {code}
> 2015-10-15 01:24:28,467 [29e0ffb4-1c91-f40a-8bf0-5e3665dcf107:foreman] WARN o.a.d.e.p.l.partition.PruneScanRule - Exception while trying to prune partition.
> java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to parquet.io.api.Binary
> at org.apache.drill.exec.store.parquet.ParquetGroupScan.populatePruningVector(ParquetGroupScan.java:414) ~[drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.planner.ParquetPartitionDescriptor.populatePartitionVectors(ParquetPartitionDescriptor.java:96) ~[drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.planner.logical.partition.PruneScanRule.doOnMatch(PruneScanRule.java:212) ~[drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.planner.logical.partition.ParquetPruneScanRule$2.onMatch(ParquetPruneScanRule.java:87) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:228) [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:808) [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at org.apache.calcite.tools.Programs$RuleSetProgram.run(Programs.java:303) [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at org.apache.calcite.prepare.PlannerImpl.transform(PlannerImpl.java:303) [calcite-core-1.4.0-drill-r6.jar:1.4.0-drill-r6]
> at org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.logicalPlanningVolcanoAndLopt(DefaultSqlHandler.java:545) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:213) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:248) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.planner.sql.handlers.ExplainHandler.getPlan(ExplainHandler.java:61) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan(DrillSqlWorker.java:178) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.work.foreman.Foreman.runSQL(Foreman.java:905) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:244) [drill-java-exec-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_71]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_71]
> at java.lang.Thread.run(Thread.java:745) [na:1.7.0_71]
> {code}
> The partition column type in this case is binary which could be causing the issue.
> Partition pruning seems to be working when we have Metadata Caching + Auto Partitioned Files with integer partition column
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