node-repository/src/main/java/com/yahoo/vespa/hosted/provision/maintenance/ApplicationMaintainer.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57

// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.maintenance;

import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.Deployer;
import com.yahoo.config.provision.Deployment;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.yolean.Exceptions;

import java.time.Duration;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Level;
import java.util.stream.Collectors;

/**
 * The application maintainer regularly redeploys all applications.
 * This is necessary because applications may gain and lose active nodes due to nodes being moved to and from the
 * failed state. This is corrected by redeploying the applications periodically.
 * It can not (at this point) be done reliably synchronously as part of the fail/unfail call due to the need for this
 * to happen at a node having the deployer.
 *
 * @author bratseth
 */
public class ApplicationMaintainer extends Maintainer {

    private final Deployer deployer;

    public ApplicationMaintainer(Deployer deployer, NodeRepository nodeRepository, Duration rate) {
        super(nodeRepository, rate);
        this.deployer = deployer;
    }

    @Override
    protected void maintain() {
        Set<ApplicationId> applications =
            nodeRepository().getNodes(Node.Type.tenant, Node.State.active).stream().map(node -> node.allocation().get().owner()).collect(Collectors.toSet());

        for (ApplicationId application : applications) {
            try {
                Optional<Deployment> deployment = deployer.deployFromLocalActive(application, Duration.ofMinutes(30));
                if ( ! deployment.isPresent()) continue; // this will be done at another config server

                deployment.get().prepare();
                deployment.get().activate();
            }
            catch (RuntimeException e) {
                log.log(Level.WARNING, "Exception on maintenance redeploy of " + application, e);
            }
        }
    }

    @Override
    public String toString() { return "Periodic application redeployer"; }

}