Errata corrige,
replce <FileSystem...> with this:
<DataStore class="org.apache.jackrabbit.core.data.FileDataStore">
<param name="path" value="/mnt/NFS/global-datastore"/>
</DataStore>
-----Messaggio originale-----
Da: Raffaele Gambelli <r.gambe...@westpole.it>
Inviato: mercoledì 28 agosto 2019 16:05
A: users@jackrabbit.apache.org
Oggetto: Jackrabbit 2.14.0 - db PersistenceManager minBlobSize and file
DataStore minRecordLength
Hi all,
I need help to understand the ratio between db PersistenceManager minBlobSize
and file DataStore minRecordLength, here follows my scenario:
I have a clustered environment using jackrabbit 2.14.0 with an Oracle
PersistenceManager and a file DataStore in a NFS storage, applications running
on Ubuntu.
Currently I have this configuration in my workspace.xml:
<FileSystem class="org.apache.jackrabbit.core.fs.local.LocalFileSystem">
<param name="path" value="${wsp.home}"/> </FileSystem> <PersistenceManager
class="org.apache.jackrabbit.core.persistence.pool.OraclePersistenceManager">
...
<param name="minBlobSize" value="16384"/> </PersistenceManager>
Documentation I found states that:
MIN RECORD LENGTH (from
http://jackrabbit.apache.org/archive/wiki/JCR/DataStore_115513387.html):
The minimum object length. The default is 100 bytes; smaller objects are stored
inline (not in the data store). Using a low value means more objects are kept
in the data store (which may result in a smaller repository, if the same object
is used in many places). Using a high value means less objects are stored in
the datastore (which may result in better performance, because less datastore
access is required). There is a limitation on the minRecordLength: the maximum
value is around 32000. The reason for this is that Java doesn't support strings
longer than 64 KB in writeUTF.
MIN BLOB SIZE
(https://jackrabbit.apache.org/api/2.8/org/apache/jackrabbit/core/persistence/pool/BundleDbPersistenceManager.html
setMinBlobSize method):
This size defines the threshold of which size a property is included in the
bundle or is stored in the blob store.
So, given that I've not configured minRecordLength, it means I'm using its
default, so 100 bytes.
But I have 16384 bytes configued as min blob size.
Is it correct what follows?
When a value (binary or not) is written, if it is less than 16384 bytes it
finishes in database, otherwise it finishes in the file datastore. So if I'm
right the default value of minRecordLenght is ignored? And what's happen if I
would have minRecordLenght greater than minBlobSize to those file included
between minBlobSize and minRecordLength?
Thanks for the clarification, best regards
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Raffaele Gambelli
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