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https://issues.apache.org/jira/browse/AVRO-947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13138548#comment-13138548
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Doug Cutting commented on AVRO-947:
-----------------------------------
Apache Commons MultiKeyMap (http://s.apache.org/c1J) might be useful here. The
cache could then be efficiently indexed by thread, the reader schema and the
writer schema, using identity hashing, so that lookups should be fast. However
this may still require synchronization.
> improve performance of resolver cache for multi-threaded applications
> ---------------------------------------------------------------------
>
> Key: AVRO-947
> URL: https://issues.apache.org/jira/browse/AVRO-947
> Project: Avro
> Issue Type: Improvement
> Components: java
> Reporter: Doug Cutting
>
> The DatumReader API is meant to be thread-safe, in that many threads should
> be able to simultaneously use a single DatumReader instance. When we first
> switched GenericDatumReader to use a resolver thread-safety was broken.
> AVRO-650 repaired this with a thread-local resolver cache, but performance
> suffered. AVRO-743 improved performance for single-threaded applications, but
> multi-threaded performance is still poor.
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