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https://issues.apache.org/jira/browse/AVRO-607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645819#comment-13645819
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Scott Carey commented on AVRO-607:
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Alternative to this patch, we could synchronize the method, or we can use a
ThreadLocal<WeakHashMap<Type, Schema>>.
A cache with a Type or Class key (that is not weak) that becomes static can
lead to classloader leaks.
In Avro code, a weak concurrent hash map is in high demand.
> SpecificData.getSchema not thread-safe
> --------------------------------------
>
> Key: AVRO-607
> URL: https://issues.apache.org/jira/browse/AVRO-607
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.3.3
> Reporter: Stephen Tu
> Priority: Minor
> Attachments: AVRO-607.patch
>
>
> SpecificData.getSchema uses a WeakHashMap to cache schemas, but WeakHashMap
> is not thread-safe, and the method itself is not synchronized. Seems like
> this could lead to the data structure getting corrupted.
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