junwen yang created IMPALA-10370:
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Summary: Thrift Message Incompatibility Detector
Key: IMPALA-10370
URL: https://issues.apache.org/jira/browse/IMPALA-10370
Project: IMPALA
Issue Type: Improvement
Reporter: junwen yang
Attachments: impala_thrift_incompatibility.txt
Regarding the issue
[IMPALA-8243|https://issues.apache.org/jira/browse/IMPALA-8234] caused by the
incompatibility of thrift message, we have created a static checker which keeps
track of the thrift file change, and detect potential incompatibility:
# Add/delete required field. The thrift guidelines suggests _Any new fields
that you add should be optional_.
# The tag number of a field has been changed. Also, the thrift guidelines
suggests _Don’t change the numeric tags for any existing fields_.
# A required field has been changed to optional, or an optional field has
been changed to required. According to the guidelines , _*Required Is Forever*
You should be very careful about marking fields as required. If at some point
you wish to stop writing or sending a required field, it will be problematic to
change the field to an optional field — old readers will consider messages
without this field to be incomplete and may reject or drop them
unintentionally. You should consider writing application-specific custom
validation routines for your buffers instead. Some have come to the conclusion
that using required does more harm than good; they prefer to use only optional.
However, this view is not universal._
We have applied our checker on the frequently maintained IMPALA versions:
refs/tags/2.10.0, refs/tags/2.11.0, refs/tags/2.12.0, refs/tags/2.7.0,
refs/tags/2.8.0, refs/tags/2.9.0, refs/tags/3.0.0, refs/tags/3.0.1,
refs/tags/3.1.0, refs/tags/3.2.0, refs/tags/3.3.0, refs/tags/3.4.0, we found
more than 1000 problems as attached.
The results reported by our checker got confirmation from developers in HBASE,
which can be found here HBASE-25340.
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