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| Note |
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This feature is still undergoing development. |
| Warning |
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The are still some issues present in Fedora 4 which may lead to partial ingests, due to synchronization timeouts. This can be partialy mitigated by increasing the replTimeout property in infinispan.xml. |
Configuration
Fedora 4 is built in top of the JCR implementation Modeshape. Modeshape uses Infinispan as a distributed datastore, which in turn uses the Messaging Toolkit JGroups to transfer state between nodes.
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- Xmx1024m Set the Java heap to 1GB
- XX:MaxPermSize=256m Set the Java PermGen size to 256MB
- fcrepo.modeshape.configuration=file:///path/to/repository.json The Modeshape configuration used for clustering
- java.net.preferIPv4Stack=true Tell Java to use IPv4 rather than IPv6
- fcrepo.ispn.jgroups.configuration=/path/to/jgroups-fcrepo-udp.xml Set the JGroups configuration file holding the UDP Transport defintions
- jgroups.udp.mcast_addr=239.42.42.42 Set the UDP multicast address for the JGroups cluster
- fcrepo.infinispan.cache_configuration=/path/to/infinispan.xml Set the Infinispan configuration file holding the Infinispan cluster configuration
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In order to use the UDP Multicasting for node discovery and TCP for replication the following JGroups example configuration can be used:
<config xmlns="urn:org:jgroups" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/JGroups-3.0.xsd">
<TCP bind_port="7800"
loopback="false"
recv_buf_size="${tcp.recv_buf_size:5M}"
send_buf_size="${tcp.send_buf_size:640K}"
max_bundle_size="64K"
max_bundle_timeout="30"
use_send_queues="true"
sock_conn_timeout="300"
timer_type="new3"
timer.min_threads="4"
timer.max_threads="10"
timer.keep_alive_time="3000"
timer.queue_max_size="500"
thread_pool.enabled="true"
thread_pool.min_threads="1"
thread_pool.max_threads="10"
thread_pool.keep_alive_time="5000"
thread_pool.queue_enabled="true"
thread_pool.queue_max_size="10000"
thread_pool.rejection_policy="discard"
oob_thread_pool.enabled="true"
oob_thread_pool.min_threads="1"
oob_thread_pool.max_threads="8"
oob_thread_pool.keep_alive_time="5000"
oob_thread_pool.queue_enabled="false"
oob_thread_pool.queue_max_size="100"
oob_thread_pool.rejection_policy="discard"/>
<MPING timeout="1000"
num_initial_members="1"/>
<MERGE2 max_interval="30000"
min_interval="10000"/>
<FD_ALL timeout="150000"/>
<VERIFY_SUSPECT timeout="150000" />
<BARRIER />
<pbcast.NAKACK2 use_mcast_xmit="false"
discard_delivered_msgs="true"/>
<UNICAST timeout="600,900,2500"/>
<pbcast.STABLE stability_delay="2000" desired_avg_gossip="50000"
max_bytes="4M"/>
<pbcast.GMS print_local_addr="true" join_timeout="6000"
view_bundling="true"/>
<MFC max_credits="2M"
min_threshold="0.4"/>
<FRAG2 frag_size="60K" />
<pbcast.STATE_TRANSFER />
</config>
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