Michael Skells created AVRO-4259:
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Summary: Thread Safety of FastReader created via static GenericData
Key: AVRO-4259
URL: https://issues.apache.org/jira/browse/AVRO-4259
Project: Apache Avro
Issue Type: Bug
Components: java
Affects Versions: 1.12.1
Environment: I can supply some sample code if useful
Reporter: Michael Skells
As I understand it readers are generally not threadsafe, for example a
FastReader has mubable state
the problem is that a FastReader isgenerally created by a FastReaderBuilder
within a GenericData, and there dont seem to be any guidlines documented to
show that thread safety isnt guaranteed here, as the reader, or some part of
the reader may be shared due to the identity of the schema being built, due to
the way that the FastReaderBuilder works
To make matters worse, there is a static singleton GlobalData, which is now the
default mechnaism to build a FastReader, and the code to build the FastReader
is thread safe, or seems to be
It hard /impossible to reason about which FastReaders are shared and which are
not due to the structure of a FastReader which may share child records and
other structure (which may be shared even if the outer structure isnt, unless
each top level FastReader is built from its own GenericData
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