Details
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Improvement
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Status: Open
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Critical
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Resolution: Unresolved
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Impala 4.3.0
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None
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None
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ghx-label-12
Description
A user running a query with many layers of inline views saw a large amount of time spent in analysis.
- Authorization finished (ranger): 7s518ms (13.134ms) - Value transfer graph computed: 7s760ms (241.953ms) - Single node plan created: 2m47s (2m39s) - Distributed plan created: 2m47s (7.430ms) - Lineage info computed: 2m47s (39.017ms) - Planning finished: 2m47s (672.518ms)
In reproducing it locally, we found that most of the stacks end up in ExprSubstitutionMap.
Here are the main stacks seen while running jstack every 3 seconds during a 75 second execution:
Location 1: (ExprSubstitutionMap::compose -> contains -> indexOf -> Expr equals) (4 samples)
java.lang.Thread.State: RUNNABLE at org.apache.impala.analysis.Expr.equals(Expr.java:1008) at java.util.ArrayList.indexOf(ArrayList.java:323) at java.util.ArrayList.contains(ArrayList.java:306) at org.apache.impala.analysis.ExprSubstitutionMap.compose(ExprSubstitutionMap.java:120)
Location 2: (ExprSubstitutionMap::compose -> verify -> Expr equals) (9 samples)
java.lang.Thread.State: RUNNABLE at org.apache.impala.analysis.Expr.equals(Expr.java:1008) at org.apache.impala.analysis.ExprSubstitutionMap.verify(ExprSubstitutionMap.java:173) at org.apache.impala.analysis.ExprSubstitutionMap.compose(ExprSubstitutionMap.java:126)
Location 3: (ExprSubstitutionMap::combine -> verify -> Expr equals) (5 samples)
java.lang.Thread.State: RUNNABLE at org.apache.impala.analysis.Expr.equals(Expr.java:1008) at org.apache.impala.analysis.ExprSubstitutionMap.verify(ExprSubstitutionMap.java:173) at org.apache.impala.analysis.ExprSubstitutionMap.combine(ExprSubstitutionMap.java:143)
Location 4: (TupleIsNullPredicate.wrapExprs -> Analyzer.isTrueWithNullSlots -> FeSupport.EvalPredicate -> Thrift serialization) (4 samples)
java.lang.Thread.State: RUNNABLE at java.lang.StringCoding.encode(StringCoding.java:364) at java.lang.String.getBytes(String.java:941) at org.apache.thrift.protocol.TBinaryProtocol.writeString(TBinaryProtocol.java:227) at org.apache.impala.thrift.TClientRequest$TClientRequestStandardScheme.write(TClientRequest.java:532) at org.apache.impala.thrift.TClientRequest$TClientRequestStandardScheme.write(TClientRequest.java:467) at org.apache.impala.thrift.TClientRequest.write(TClientRequest.java:394) at org.apache.impala.thrift.TQueryCtx$TQueryCtxStandardScheme.write(TQueryCtx.java:3034) at org.apache.impala.thrift.TQueryCtx$TQueryCtxStandardScheme.write(TQueryCtx.java:2709) at org.apache.impala.thrift.TQueryCtx.write(TQueryCtx.java:2400) at org.apache.thrift.TSerializer.serialize(TSerializer.java:84) at org.apache.impala.service.FeSupport.EvalExprWithoutRowBounded(FeSupport.java:206) at org.apache.impala.service.FeSupport.EvalExprWithoutRow(FeSupport.java:194) at org.apache.impala.service.FeSupport.EvalPredicate(FeSupport.java:275) at org.apache.impala.analysis.Analyzer.isTrueWithNullSlots(Analyzer.java:2888) at org.apache.impala.analysis.TupleIsNullPredicate.requiresNullWrapping(TupleIsNullPredicate.java:181) at org.apache.impala.analysis.TupleIsNullPredicate.wrapExpr(TupleIsNullPredicate.java:147) at org.apache.impala.analysis.TupleIsNullPredicate.wrapExprs(TupleIsNullPredicate.java:136)