James Xu created STORM-84:
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Summary: Don't use hashCode for fields grouping
Key: STORM-84
URL: https://issues.apache.org/jira/browse/STORM-84
Project: Apache Storm (Incubating)
Issue Type: Improvement
Reporter: James Xu
https://github.com/nathanmarz/storm/issues/244
The contract of hashCode does not guarantee that it will be consistent across
JVM's, so it's just a coincidence that it happens to work. We need a new way to
do hashcodes. Hopefully there's an open source library that already solves this
problem, otherwise we'll have to build a solution for this to get hashcodes for
arbitrary objects.
A tempting way to do it would be to hash the serialized form of an object, but
this has two issues:
1. Equal objects are not guaranteed to have same serialized form (e.g., it
represents a set and elements are serialized out of order
2. We don't want to incur the serialization cost when sending between tasks
colocated in the same worker
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