Hi guys,
Just deployed 0.9.5.0.pre with hypernode (our hypertable nodejs binding),
which uses the new C++ async scanner api. I'm seeing an error on an async
read.
The error looks like:
/usr/local/include/boost/smart_ptr/intrusive_ptr.hpp:166: T*
boost::intrusive_ptr<T>::operator->() const [with T =
Hypertable::CellsBuilder]: Assertion `px != 0' failed.
This traces back to a class I defined in the binding, that derives from
ResultCallback.
class ScanCallback: public Hypertable::ResultCallback {
public:
ScanCallback() : m_cells(8) {}
virtual ~ScanCallback() {}
void
scan_ok (TableScannerAsync *scanner, ScanCellsPtr &cells) {
ScopedLock lock(mutex);
Cells cc;
=> cells->get(cc);
for (Hypertable::Cells::iterator ci = cc.begin(),
cend = cc.end(); ci != cend; ci++) {
m_cells.add(*ci);
}
}
...
}
The error is happening at the [ cells->get(cc) ] call marked in the code
fragment above.
The backtrace looks like:
(gdb) bt
#0 0x00007ffff64e3ba5 in raise () from /lib/libc.so.6
#1 0x00007ffff64e76b0 in abort () from /lib/libc.so.6
#2 0x00007ffff64dca71 in __assert_fail () from /lib/libc.so.6
#3 0x00007fffd1b6a3eb in
boost::intrusive_ptr<Hypertable::CellsBuilder>::operator-> (this=0xcaf608)
at /usr/local/include/boost/smart_ptr/intrusive_ptr.hpp:166
#4 0x00007fffd1b630ca in Hypertable::ScanCells::get (this=0xcaf5a0,
cells=...) at /a/hypertable/current/include/Hypertable/Lib/ScanCells.h:50
#5 0x00007fffd1b650ac in HyperConn::ScanCallback::scan_ok (this=0xcede80,
scanner=0xc2fb00, cells=...) at ../binding.cc:70
#6 0x00007fffd186d6d8 in Hypertable::TableScannerAsync::maybe_callback_ok
(this=0xc2fb00, scanner_id=<value optimized out>, next=<value optimized
out>, do_callback=255, cells=...) at /home/developer/s\
rc/hypertable/src/cc/Hypertable/Lib/TableScannerAsync.cc:334
#7 0x00007fffd1871b9a in Hypertable::TableScannerAsync::handle_result
(this=0xc2fb00, scanner_id=0, event=<value optimized out>, is_create=<value
optimized out>) at /home/developer/src/hypertable/src/\
cc/Hypertable/Lib/TableScannerAsync.cc:267
#8 0x00007fffd18753b4 in Hypertable::TableScannerHandler::run
(this=0xcac410) at
/home/developer/src/hypertable/src/cc/Hypertable/Lib/TableScannerHandler.cc:40
#9 0x00007fffd173bfab in operator() (this=0xc96890) at
/home/developer/src/hypertable/src/cc/AsyncComm/ApplicationQueue.h:154
#10 boost::detail::thread_data<Hypertable::ApplicationQueue::Worker>::run
(this=0xc96890) at /usr/local/include/boost/thread/detail/thread.hpp:56
#11 0x00007fffcf33cb70 in thread_proxy () from
/a/hypertable/current/lib/libboost_thread.so.1.40.0
#12 0x00007ffff683a971 in start_thread () from /lib/libpthread.so.0
#13 0x00007ffff659692d in clone () from /lib/libc.so.6
#14 0x0000000000000000 in ?? ()
Tracing it back, it is happening in Hypertable/Lib/ScanCells.h:50
void ScanCells::get(Cells &cells) { m_cells->get(cells); }
The value contained by the intrusive_ptr m_cells is null at this point.
(gdb)
#4 0x00007fffd1b630ca in Hypertable::ScanCells::get (this=0xcaf5a0,
cells=...) at /a/hypertable/current/include/Hypertable/Lib/ScanCells.h:50
(gdb) p m_cells
$1 = {px = 0x0}
----
So my question is: what does
ResultCallback::scan_ok(TableScannerAsync *scanner, ScanCellsPtr &cells)
indicate ? Are there any checks that need to be done before we can attempt
to read off the cells contained in the ScanCellsPtr &cells ? Couldn't find
anything obvious in code, hence asking..
TIA,
--Naveen
founder & ceo, campfire labs. 415 425 5412. We're hiring!
http://www.campfirelabs.com/jobs
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