Quanlong Huang created IMPALA-13570: ---------------------------------------
Summary: Thread names not shown in top outputs
Key: IMPALA-13570
URL: https://issues.apache.org/jira/browse/IMPALA-13570
Project: IMPALA
Issue Type: Bug
Components: Backend
Reporter: Quanlong Huang
We set the thread name when launching fragment instance threads. It contains
the fragment instance id:
{code:cpp}
string thread_name =
Substitute("$0 (finst:$1)",
FragmentInstanceState::FINST_THREAD_NAME_PREFIX,
PrintId(instance_ctx->fragment_instance_id));
unique_ptr<Thread> t;
// Inject thread creation failures through debug actions if enabled.
Status debug_action_status =
DebugAction(query_options(), "FIS_FAIL_THREAD_CREATION");
start_finstances_status = !debug_action_status.ok() ?
debug_action_status :
Thread::Create(FragmentInstanceState::FINST_THREAD_GROUP_NAME,
thread_name,
[this, fis]() { this->ExecFInstance(fis); }, &t, true); {code}
[https://github.com/apache/impala/blob/e5919f13f93ae6e5cfa9fb01219bddb84c9cc474/be/src/runtime/query-state.cc#L907-L918]
However, in the top output, thread names are still shown as "impalad". When
debugging in gdb, I also see the thread names are just "impalad".
{noformat}
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
609 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:02.57 impalad
625 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.52 impalad
626 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 impalad
627 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 impalad
628 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 impalad
652 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
653 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
654 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
655 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
656 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.03 GC task
thread#
657 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
658 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
659 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
660 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.03 GC task
thread#
661 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.04 GC task
thread#
662 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.05 VM Thread
663 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 Reference
Handl
664 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 Finalizer
665 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 Signal
Dispatch
666 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 JDWP
Transport
667 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 JDWP Event
Help
668 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:01.59 C2
CompilerThre
669 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:01.51 C2
CompilerThre
670 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:01.10 C2
CompilerThre
671 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.71 C1
CompilerThre
672 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 Service
Thread
673 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.02 VM Periodic
Tas
680 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00
org.apache.hado
682 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 client
DomainSo
683 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 JVM pause
monit
684 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 Transaction
kee
686 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00 Transaction
kee
687 quanlong 20 0 11.914g 602804 165800 t 0.0 1.8 0:00.00
impalad{noformat}
JVM thread names are shown correctly in top and gdb. It'd be nice to fix the
thread names of fragment instance threads. So in the top output, we can
directly see which fragment instance or query is occupying cpu/mem.
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