Hazelcast Map Configuration For Data Backup

Question

1.Trying to create a cluster using Hazelcast. In case of data backup:

<hazelcast>
  <map name="**default**">
    <backup-count>1</backup-count>
  </map>
</hazelcast>

From the above snippet, just wanted to clarify what does "default" map name stands for? does it mean that all maps will have backup count 1, or the map name "default" will have a backup count of 1.

HazelCast Reference Link

Is there a way I can iterate over all the maps across the cluster ?

score 1 · Answer 1 · answered Apr 23 '18 at 06:06

The name "default" (not "**default**") means any map.

If you have doubt over this, create a cluster of two nodes, put some data into a Hazelcast map and kill one node. If backup count was 1 for that map, you won't have lost data for that map.

Try

Set<String> iMapNames = this.hazelcastInstance.getDistributedObjects().stream()
        .filter(distributedObject -> distributedObject instanceof IMap)
        .map(distributedObject -> distributedObject.getName()).collect(Collectors.toCollection(TreeSet::new));

iMapNames.stream().forEach(name -> {
    IMap<?, ?> iMap = this.hazelcastInstance.getMap(name);
    System.out.printf("IMap: '%s'%n", iMap.getName());
}

Hazelcast Map Configuration For Data Backup

1 Answers1