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https://issues.apache.org/jira/browse/KUDU-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17315447#comment-17315447
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YifanZhang commented on KUDU-3271:
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[~awong] I have attached the INFO log of that day related to the being scanned
tablet. It was about 16:34 when the tablet server crashed. At that time a user
executed the query `select count(1) from xxx`. But we failed to reporduce this
problem by executing the same query today.
> Tablet server crashed when handle scan request
> ----------------------------------------------
>
> Key: KUDU-3271
> URL: https://issues.apache.org/jira/browse/KUDU-3271
> Project: Kudu
> Issue Type: Bug
> Affects Versions: 1.12.0
> Reporter: YifanZhang
> Priority: Major
> Attachments: tablet-52a743.log
>
>
> We found that one of kudu tablet server crashed when handle scan request. The
> scanned table didn't have any row operations at that time. This issue only
> came up once so far.
> Coredump stack is:
> {code:java}
> Program terminated with signal 11, Segmentation fault.
> (gdb) bt
> #0 kudu::tablet::DeltaApplier::HasNext (this=<optimized out>) at
> /home/zhangyifan8/work/kudu-xm/src/kudu/tablet/delta_applier.cc:84
> #1 0x0000000002185900 in kudu::UnionIterator::HasNext (this=<optimized out>)
> at /home/zhangyifan8/work/kudu-xm/src/kudu/common/generic_iterators.cc:1051
> #2 0x0000000000a2ea8f in kudu::tserver::ScannerManager::UnregisterScanner
> (this=0x4fea140, scanner_id=...) at
> /home/zhangyifan8/work/kudu-xm/src/kudu/tserver/scanners.cc:195
> #3 0x00000000009e7adf in ~ScopedUnregisterScanner (this=0x7f2d72167610,
> __in_chrg=<optimized out>) at
> /home/zhangyifan8/work/kudu-xm/src/kudu/tserver/scanners.h:179
> #4 kudu::tserver::TabletServiceImpl::HandleContinueScanRequest
> (this=this@entry=0x60edef0, req=req@entry=0x9582e880,
> rpc_context=rpc_context@entry=0x8151d7800,
> result_collector=result_collector@entry=0x7f2d721679f0,
> has_more_results=has_more_results@entry=0x7f2d721678f9,
> error_code=error_code@entry=0x7f2d721678fc) at
> /home/zhangyifan8/work/kudu-xm/src/kudu/tserver/tablet_service.cc:2737
> #5 0x00000000009fb009 in kudu::tserver::TabletServiceImpl::Scan
> (this=0x60edef0, req=0x9582e880, resp=0xb87b16de0, context=0x8151d7800) at
> /home/zhangyifan8/work/kudu-xm/src/kudu/tserver/tablet_service.cc:1907
> #6 0x000000000210f019 in operator() (__args#2=0x8151d7800,
> __args#1=0xb87b16de0, __args#0=<optimized out>, this=0x4e0c7708) at
> /usr/include/c++/4.8.2/functional:2471
> #7 kudu::rpc::GeneratedServiceIf::Handle (this=0x60edef0, call=<optimized
> out>) at /home/zhangyifan8/work/kudu-xm/src/kudu/rpc/service_if.cc:139
> #8 0x000000000210fcd9 in kudu::rpc::ServicePool::RunThread (this=0x50fb9e0)
> at /home/zhangyifan8/work/kudu-xm/src/kudu/rpc/service_pool.cc:225
> #9 0x000000000228ecaf in operator() (this=0xc1a58c28) at
> /usr/include/c++/4.8.2/functional:2471
> #10 kudu::Thread::SuperviseThread (arg=0xc1a58c00) at
> /home/zhangyifan8/work/kudu-xm/src/kudu/util/thread.cc:674#11
> 0x00007f2de6b8adc5 in start_thread () from /lib64/libpthread.so.0#12
> 0x00007f2de4e6873d in clone () from /lib64/libc.so.6
> {code}
>
>
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