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https://issues.apache.org/jira/browse/JCR-1563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593271#action_12593271
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Thomas Mueller commented on JCR-1563:
-------------------------------------

Because of the prefix, and because the id is string based (DataIdentifier, BLOB 
id).

Large values that are stored in the data store are persisted as: 
dataStore:<sha-1>

Small values (that are kept in memory) are persisted as: 
0x<hex encoded value>

Values that are stored in a FileSystemResource (resource-based BLOB store) are 
persisted as: 
fsResource:<blob id>

Values that are stored in a temporary file are persisted as: 
file:<file name> (actually those should never be written)



> Data Store: UTFDataFormatException when using large minRecordLength
> -------------------------------------------------------------------
>
>                 Key: JCR-1563
>                 URL: https://issues.apache.org/jira/browse/JCR-1563
>             Project: Jackrabbit
>          Issue Type: Bug
>            Reporter: Thomas Mueller
>            Priority: Minor
>
> If using a value larger than 33000 for minRecordLength, and then trying to 
> store a value with 33000 bytes, the following exception is thrown: 
> UTFDataFormatException. The reason is that values are serialized using 
> DataOutputStream.writeUTF. There is size limitation of 65 K when using this 
> method. Small entries are hex encoded, and there is a prefix, so the 
> limitation for minRecordLength should be 32000.
> This is a problem for both FileDataStore and DbDataStore.

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