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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14920) S3: Optimize SimpleFetchOptimizer::checkThreshold()
Date Mon, 10 Oct 2016 11:57:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rajesh Balamohan updated HIVE-14920:
------------------------------------
    Status: Patch Available  (was: Open)

> 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
>         Attachments: HIVE-14920.1.patch
>
>
> 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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