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Posted to issues-all@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2023/05/28 13:32:00 UTC
[jira] [Resolved] (IMPALA-11803) impalad hit DCHECK when running union on empty table with MT_DOP>1
[ https://issues.apache.org/jira/browse/IMPALA-11803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Quanlong Huang resolved IMPALA-11803.
-------------------------------------
Fix Version/s: Impala 4.3.0
Resolution: Fixed
> impalad hit DCHECK when running union on empty table with MT_DOP>1
> ------------------------------------------------------------------
>
> Key: IMPALA-11803
> URL: https://issues.apache.org/jira/browse/IMPALA-11803
> Project: IMPALA
> Issue Type: Bug
> Reporter: Quanlong Huang
> Assignee: Pranav Yogi Lodha
> Priority: Major
> Fix For: Impala 4.3.0
>
>
> This is reported from a community user. When using the DEBUG build, impalad could hit DCHECK and crash when running union with empty table with MT_DOP>1.
> I can reproduce the issue by launching the impala cluster with only one node:
> {code:java}
> bin/start-impala-cluster.py -r -s 1
> {code}
> Then run the following queries
> {code:sql}
> create table empty_tbl (id int) stored as parquet;
> create table tbl (id int) stored as parquet;
> insert into tbl values (0), (1), (2);
> insert into tbl values (3);
> set mt_dop=2;
> select count(*) from (select * from empty_tbl union all select * from tbl) t;
> {code}
> The stacktrace in impalad.ERROR:
> {code:java}
> F1216 14:51:44.285214 24142 hdfs-scan-node-base.cc:352] b444e7823f021f02:5af2aa4700000000] Check failed: shared_state_.use_mt_scan_node_ || instance_ctx_pbs.size() == 1 Non MT scan node should only have a single instance.
> *** Check failure stack trace: ***
> @ 0x379c53d google::LogMessage::Fail()
> @ 0x379e474 google::LogMessage::SendToLog()
> @ 0x379bf1c google::LogMessage::Flush()
> @ 0x379e999 google::LogMessageFatal::~LogMessageFatal()
> @ 0x197ddfd impala::HdfsScanPlanNode::ProcessScanRangesAndInitSharedState()
> @ 0x197ef4f impala::HdfsScanPlanNode::Init()
> @ 0x1961150 _ZN6impala8PlanNode16CreateTreeHelperEPNS_13FragmentStateERKSt6vectorINS_9TPlanNodeESaIS4_EEPS0_PiPS9_.localalias
> @ 0x1961082 _ZN6impala8PlanNode16CreateTreeHelperEPNS_13FragmentStateERKSt6vectorINS_9TPlanNodeESaIS4_EEPS0_PiPS9_.localalias
> @ 0x1961082 _ZN6impala8PlanNode16CreateTreeHelperEPNS_13FragmentStateERKSt6vectorINS_9TPlanNodeESaIS4_EEPS0_PiPS9_.localalias
> @ 0x1961205 impala::PlanNode::CreateTree()
> @ 0x13c56c2 impala::FragmentState::Init()
> @ 0x13c76b9 impala::FragmentState::CreateFragmentStateMap()
> @ 0x134492e impala::QueryState::StartFInstances()
> @ 0x1335036 impala::QueryExecMgr::ExecuteQueryHelper()
> @ 0x1336100 boost::detail::function::void_function_obj_invoker0<>::invoke()
> @ 0x18c7018 impala::Thread::SuperviseThread()
> @ 0x18c7e21 boost::detail::thread_data<>::run()
> @ 0x239bb77 thread_proxy
> @ 0x7effc4fcf6db start_thread
> @ 0x7effc1d6f61f clone
> {code}
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