[IMPALA-4330] Python failure in our builds

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Impala 2.8.0
• Component/s: Infrastructure
• Labels: broken-build
• Assignee: Lars Volker
• Reporter: Taras Bobrovytsky
• Created: 20/Oct/16 22:04
• Updated: 03/Nov/16 11:29
• Resolved: 03/Nov/16 11:29

Description

There is a strange Python build failure that happens in our builds, for example
http://sandbox.jenkins.cloudera.com/job/impala-external-gerrit-verify-merge-ASF/316/

Skipping STATS metric impala-server.io.mgr.cached-file-handles-hit-ratio
Skipping SET metric tmp-file-mgr.active-scratch-dirs.list
/data/jenkins/workspace/impala-external-gerrit-verify-merge-ASF/repos/Impala/common/thrift/MetricDefs.thrift created.
Traceback (most recent call last):
  File "/data/jenkins/workspace/impala-external-gerrit-verify-merge-ASF/repos/Impala/common/thrift/generate_metrics.py", line 250, in <module>
    generate_mdl()
  File "/data/jenkins/workspace/impala-external-gerrit-verify-merge-ASF/repos/Impala/common/thrift/generate_metrics.py", line 229, in generate_mdl
    mdl = json.loads(MDL_BASE)
  File "/usr/lib64/python2.6/json/__init__.py", line 307, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python2.6/json/decoder.py", line 319, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python2.6/json/decoder.py", line 336, in raw_decode
    obj, end = self._scanner.iterscan(s, **kw).next()
  File "/usr/lib64/python2.6/json/scanner.py", line 55, in iterscan
    rval, next_pos = action(m, context)
  File "/usr/lib64/python2.6/json/decoder.py", line 183, in JSONObject
    value, end = iterscan(s, idx=end, context=context).next()
  File "/usr/lib64/python2.6/json/scanner.py", line 55, in iterscan
    rval, next_pos = action(m, context)
  File "/usr/lib64/python2.6/json/decoder.py", line 219, in JSONArray
    raise ValueError(errmsg("Expecting object", s, end))
ValueError: Expecting object: line 19 column 3 (char 429)

The failure is caused by this command: json.loads(MDL_BASE)
It's strange because MDL_BASE is a hardcoded string.