[jira] [Resolved] (DRILL-1859) IllegalReferenceCountException in the decoder inside Netty

["Yuliya Feldman (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-1859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yuliya Feldman resolved DRILL-1859.
-----------------------------------
    Resolution: Fixed

> IllegalReferenceCountException in the decoder inside Netty
> ----------------------------------------------------------
>
>                 Key: DRILL-1859
>                 URL: https://issues.apache.org/jira/browse/DRILL-1859
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - RPC
>    Affects Versions: 0.7.0
>            Reporter: Aman Sinha
>            Assignee: Yuliya Feldman
>             Fix For: 0.8.0
>
>         Attachments: 0001-DRILL-1926-Fix-for-back-pressure-logic.patch, 0002-DRILL-1859-Issue-with-killing-stopping-operator-proc.patch, decoder_err.txt
>
>
> The following query does a LIMIT inside a subquery to force a UnionExchange and then does an ORDER-BY outside that will first re-distribute the data before sorting.  It results in a DecoderException in netty.
> {code}
> 0: jdbc:drill:zk=local> alter session set `planner.slice_target` = 10;
> +------------+------------+
> |     ok     |  summary   |
> +------------+------------+
> | true       | planner.slice_target updated. |
> +------------+------------+
> 0: jdbc:drill:zk=local> select t2.o_custkey from (select o_orderkey, o_custkey from cp.`tpch/orders.parquet` t1 group by o_orderkey, o_custkey limit 10) t2 order by t2.o_custkey;
> Query failed: Query failed: Failure while running fragment., refCnt: 0, decrement: 1 
> {code}
> Here's partial output from the logs: (will attach full error log).  
> {code}
> io.netty.handler.codec.DecoderException: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1
>         io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:99) [netty-codec-4.0.24.Final.jar:4.0.24.Final]
>         io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-transport-4.0.24.Final.jar:4.0.24.Final]
> {code}



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