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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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