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https://issues.apache.org/jira/browse/AVRO-1760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033431#comment-15033431
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Tom White commented on AVRO-1760:
---------------------------------

How about seeing if Guava's thread-safe maps help here? (See Doug's comment, 
https://issues.apache.org/jira/browse/AVRO-607?focusedCommentId=12895846&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12895846.)
 If they do, then we can shade Guava to avoid JAR conflict issues. 

> Thread scalability problem with the use of SynchronizedMap
> ----------------------------------------------------------
>
>                 Key: AVRO-1760
>                 URL: https://issues.apache.org/jira/browse/AVRO-1760
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>    Affects Versions: 1.7.4, 1.7.5, 1.7.6, 1.7.7, 1.8.0, 1.8.1, 1.9.0
>            Reporter: Mulugeta Mammo
>            Priority: Critical
>              Labels: patch, performance
>             Fix For: 1.7.4, 1.7.5, 1.7.6, 1.7.7, 1.7.8, 1.8.0, 1.8.1, 1.9.0
>
>         Attachments: AVRO-1760.patch, AVRO-1760.pdf
>
>
> While running Adam Genomics (which uses Avro) on Apache Spark, we discovered 
> that threads (tasks in Spark Context) block in Avro while executing the 
> getDefaultValue(Field field) method in 
> https://github.com/apache/avro/blob/trunk/lang/java/avro/src/main/java/org/apache/avro/generic/GenericData.java



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