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(dead) time series persistence using PyTables
Python
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README
pytablestimeseries.py

README

usage:

    historyStorage = PyTablesTimeSeries(historyFilepath)
    # write:
    self.historyStorage.append(keyName, fieldName, duration, value, timestamp)
    # read:
    selection = self.historyStorage.selectTimeSlice(keyName, fieldName, duration, begin_time, end_time)


currently isn't very useful because after running for two minutes or so under load (multithreaded, although i don't see why that should matter because i'm doing everything in a lock, unless PyTables is keeping a global cache itself), i keep getting errors like this (the line numbers from this project have changed since this error was captured):

  File "atr/pytablestimeseries.py", line 94, in _wrap
    kw['table'] = self._getTable(item, field, duration)
  File "atr/pytablestimeseries.py", line 42, in _getTable
    durationGroup = getattr(root, str(duration))
  File "/usr/lib/python2.7/dist-packages/tables/group.py", line 826, in __getattr__
    return self._f_getChild(name)
  File "/usr/lib/python2.7/dist-packages/tables/group.py", line 700, in _f_getChild
    return self._v_file._getNode(childPath)
  File "/usr/lib/python2.7/dist-packages/tables/file.py", line 1035, in _getNode
    "stale weak reference to dead node ``%s``" % nodePath
AssertionError: stale weak reference to dead node ``/0``


note that line 97 of _wrap is AFTER i have closed and reopened the file! So i don't see why it isn't reset. I'm using Ubuntu package libhdf5-serial-1.8.4 version 1.8.4-patch1-2ubuntu3, and PyTables 2.3.1.




other time series persistence packages for python:

http://pytseries.sourceforge.net/lib.database.html


some commands useful for installing:
    pip install decorator # http://pypi.python.org/pypi/decorator
    sudo aptitude install python-numexpr
    http://sourceforge.net/projects/pytables/files/pytables/2.3.1/
    sudo dpkg -i ~root/python-tables_2.3.1-1.1_amd64.deb

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