Hello,
I have a client application that listens for events during data acquisition
and updates a Table. Recently I started receiving errors part-way through a
scan, once after 100 points, once after about 400:
Traceback (most recent call last):
File "/home/specuser/src/xpaxs/xpaxs/instrumentation/spec/runner.py", line
115, in update
SpecEventsDispatcher.dispatch()
File "/home/specuser/src/xpaxs/SpecClient/SpecEventsDispatcher.py", line
336, in dispatch
receiver(args)
File "/home/specuser/src/xpaxs/SpecClient/SpecEventsDispatcher.py", line
49, in __call__
return robustApply(slot, arguments)
File "/home/specuser/src/xpaxs/SpecClient/SpecEventsDispatcher.py", line
36, in robustApply
return slot(*arguments[0:n_args])
File "/home/specuser/src/xpaxs/SpecClient/SpecScan.py", line 114, in
__newScanData
self.newScanData(scanData)
File "/home/specuser/src/xpaxs/xpaxs/instrumentation/spec/scan.py", line
103, in newScanData
self._scanData.appendDataPoint(scanData)
File "/home/specuser/src/xpaxs/xpaxs/frontends/xfs/fileinterface.py", line
214, in appendDataPoint
row = self.h5Node.data.row
File "/usr/lib/python2.5/site-packages/tables/group.py", line 854, in
__getattr__
return self._f_getChild(name)
File "/usr/lib/python2.5/site-packages/tables/group.py", line 736, in
_f_getChild
return self._v_file._getNode(childPath)
File "/usr/lib/python2.5/site-packages/tables/file.py", line 914, in
_getNode
"stale weak reference to dead node ``%s``" % parentPath
AssertionError: stale weak reference to dead node ``/scan3/data``
Could anyone please offer a suggestion, why would my "data" table become a
dead node? At each point in the scan, I do something like:
row = self.h5Node.data.row
for key, val in data.iteritems():
row[key] = val
row.append()
self.h5Node.data.flush()
where self.h5Node is a reference to the "/scan3" group.
Thanks,
Darren
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