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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-1834) Misleading error message when querying an empty Parquet file
Date Sun, 04 Jan 2015 23:57:46 GMT

     [ https://issues.apache.org/jira/browse/DRILL-1834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jacques Nadeau updated DRILL-1834:
    Fix Version/s: Future
         Priority: Minor  (was: Major)

> Misleading error message when querying an empty Parquet file
> ------------------------------------------------------------
>                 Key: DRILL-1834
>                 URL: https://issues.apache.org/jira/browse/DRILL-1834
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>    Affects Versions: 0.7.0
>            Reporter: Aman Sinha
>            Priority: Minor
>             Fix For: Future
> It is possible that a CTAS may fail and create an empty Parquet file.  When we run a
query against this file, we get a misleading error message from the planner that hides the
original IOException, although the log file does have the original exception: 
> {code:sql}
> 0: jdbc:drill:zk=local> select count(*) from dfs.`/tmp/empty.parquet`;
> Query failed: Query failed: Unexpected exception during fragment initialization: Internal
error: Error while applying rule DrillPushProjIntoScan, args [rel#77:ProjectRel.NONE.ANY([]).[](child=rel#76:Subset#0.ENUMERABLE.ANY([]).[],$f0=0),
rel#68:EnumerableTableAccessRel.ENUMERABLE.ANY([]).[](table=[dfs, /tmp/empty.parquet])]
> {code}
> The cause of the exception is in the logs: 
> Caused by: java.io.IOException: Could not read footer: java.lang.RuntimeException: file:/tmp/empty.parquet
is not a Parquet file (too small)
>         at parquet.hadoop.ParquetFileReader.readAllFootersInParallel(ParquetFileReader.java:195)
>         at parquet.hadoop.ParquetFileReader.readAllFootersInParallel(ParquetFileReader.java:208)
>         at parquet.hadoop.ParquetFileReader.readFooters(ParquetFileReader.java:224) ~[parquet-hadoop-1.5.1-drill-r4.jar:0.7.0-SNAPSHOT]
>         at org.apache.drill.exec.store.parquet.ParquetGroupScan.readFooter(ParquetGroupScan.java:208)

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