Rajesh Balamohan created HIVE-14920:
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Summary: S3: Optimize SimpleFetchOptimizer::checkThreshold()
Key: HIVE-14920
URL: https://issues.apache.org/jira/browse/HIVE-14920
Project: Hive
Issue Type: Improvement
Reporter: Rajesh Balamohan
Assignee: Rajesh Balamohan
Priority: Minor
Query: Simple query like the following takes lot longer time in query
compilation phase (~330 seconds for 200 GB dataset with tpc-ds)
{noformat}
select ws_item_sk from web_sales where ws_item_sk > 10 limit 10;
{noformat}
This enables {{SimpleFetchOptimizer}} which internally tries to figure out if
the size of the data is within the threshold defined in
{{hive.fetch.task.conversion.threshold}} ~1GB.
This turns out to be super expensive when the dataset is partitioned. E.g
stacktrace is given below. Note that this happens in client side and tries to
get the length for 1800+ partitions before proceeding to next rule.
{noformat}
at
org.apache.hadoop.fs.FileSystem.getContentSummary(FileSystem.java:1486)
at
org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer$FetchData.getFileLength(SimpleFetchOptimizer.java:466)
at
org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer$FetchData.calculateLength(SimpleFetchOptimizer.java:451)
at
org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer$FetchData.getInputLength(SimpleFetchOptimizer.java:423)
at
org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer$FetchData.access$300(SimpleFetchOptimizer.java:323)
at
org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer.checkThreshold(SimpleFetchOptimizer.java:168)
at
org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer.optimize(SimpleFetchOptimizer.java:133)
at
org.apache.hadoop.hive.ql.optimizer.SimpleFetchOptimizer.transform(SimpleFetchOptimizer.java:105)
at
org.apache.hadoop.hive.ql.optimizer.Optimizer.optimize(Optimizer.java:207)
at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:10466)
at
org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:216)
at
org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:230)
at
org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:74)
at
org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:230)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:464)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:320)
at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1219)
at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1260)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1156)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1146)
at
org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:217)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:169)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:380)
at
org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:740)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:685)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:625)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.run(RunJar.java:233)
at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
{noformat}
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