lib/python/impala_py_lib/profiles.py

#!/usr/bin/env impala-python
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# This file contains library functions to decode and access Impala query profiles.

from __future__ import absolute_import, division, print_function
import base64
import datetime
import zlib
from thrift.protocol import TCompactProtocol
from thrift.TSerialization import deserialize
from RuntimeProfile.ttypes import TRuntimeProfileTree


def decode_profile_line(line):
  space_separated = line.split(" ")
  if len(space_separated) == 3:
    ts = int(space_separated[0])
    print(datetime.datetime.fromtimestamp(ts / 1000.0).isoformat(), space_separated[1])
    base64_encoded = space_separated[2]
  elif len(space_separated) == 1:
    base64_encoded = space_separated[0]
  else:
    raise Exception("Unexpected line: " + line)
  possibly_compressed = base64.b64decode(base64_encoded)
  # Handle both compressed and uncompressed Thrift profiles
  try:
    thrift = zlib.decompress(possibly_compressed)
  except zlib.error:
    thrift = possibly_compressed

  tree = TRuntimeProfileTree()
  deserialize(tree, thrift, protocol_factory=TCompactProtocol.TCompactProtocolFactory())
  tree.validate()

  return tree