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https://issues.apache.org/jira/browse/OAK-2843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15035683#comment-15035683
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Thomas Mueller commented on OAK-2843:
-------------------------------------
I could now verify the cache works as expected. My test was:
* Two cluster nodes, using the MongoDB document store.
* Delete the persistent cache files.
* Using the persistent cache setting is follows (OSGi configuration):
{noformat}
persistentCache="crx-quickstart/repository/cache,size\=1024,binary\=0,broadcast\=tcp:key
123"
{noformat}
* Read all nodes of the repository (called "traversal check" in our
application).
* This took 20 seconds (because it had to load all nodes from MongoDB).
* Do the same on the other cluster node, which only took 5 seconds.
I ran the same test without the broadcasting cache enabled, that is just with
{noformat}
persistentCache="crx-quickstart/repository/cache,size\=1024,binary\=0"
{noformat}
The first time it took 24 seconds on _each_ cluster node (because both cluster
nodes have to load all data from MongoDB, if the persistent cache is empty).
The second time it took 5 seconds. After a restart (but without deleting the
local persistent cache), it also took 5 seconds.
> Broadcasting cache
> ------------------
>
> Key: OAK-2843
> URL: https://issues.apache.org/jira/browse/OAK-2843
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: mongomk
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Fix For: 1.3.12
>
>
> In a cluster environment, we could speed up reading if the cache(s) broadcast
> data to other instances. This would avoid bottlenecks at the storage layer
> (MongoDB, RDBMs).
> The configuration metadata (IP addresses and ports of where to send data to,
> a unique identifier of the repository and the cluster nodes, possibly
> encryption key) rarely changes and can be stored in the same place as we
> store cluster metadata (cluster info collection). That way, in many cases no
> manual configuration is needed. We could use TCP/IP and / or UDP.
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