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Modify state of VerifyRepositoryResponse for bwc (#30762) 

The VerifyRepositoryResponse class holds a DiscoveryNode[], but the
nodes themselves are not serialized to a REST API consumer. Since we do
not want to put all of a DiscoveryNode over the wire, be it REST or
Transport since its unused, this change introduces a BWC compatible
change in ser/deser of the Response. Anything 6.4 and above will
read/write a NodeView, and anything prior will read/write a
DiscoveryNode. Further changes to 7.0 will be introduced to remove the
BWC shim and only read/write NodeView, and hold a List<NodeView> as the
VerifyRepositoryResponse internal state.
This commit is contained in:
Michael Basnight 2018-05-22 14:55:20 -05:00 committed by GitHub
parent 0fc22de336
commit a8cea90e10
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4 changed files with 118 additions and 26 deletions
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138
server/src/main/java/org/elasticsearch/action/admin/cluster/repositories/verify/VerifyRepositoryResponse.java
View File

@ -19,23 +19,112 @@
package org.elasticsearch.action.admin.cluster.repositories.verify;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.ToXContentObject;
import org.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
/**
* Unregister repository response
* Verify repository response
*/
public class VerifyRepositoryResponse extends ActionResponse implements ToXContentObject {
private DiscoveryNode[] nodes;
static final String NODES = "nodes";
static final String NAME = "name";
public static class NodeView implements Writeable, ToXContentObject {
private static final ObjectParser.NamedObjectParser<NodeView, Void> PARSER;
static {
ObjectParser<NodeView, Void> internalParser = new ObjectParser<>(NODES);
internalParser.declareString(NodeView::setName, new ParseField(NAME));
PARSER = (p, v, name) -> internalParser.parse(p, new NodeView(name), null);
}
final String nodeId;
String name;
public NodeView(String nodeId) { this.nodeId = nodeId; }
public NodeView(String nodeId, String name) {
this(nodeId);
this.name = name;
}
public NodeView(StreamInput in) throws IOException {
this(in.readString(), in.readString());
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeString(nodeId);
out.writeString(name);
}
void setName(String name) { this.name = name; }
public String getName() { return name; }
public String getNodeId() { return nodeId; }
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(nodeId);
{
builder.field(NAME, name);
}
builder.endObject();
return builder;
}
/**
* Temporary method that allows turning a {@link NodeView} into a {@link DiscoveryNode}. This representation will never be used in
* practice, because in >= 6.4 a consumer of the response will only be able to retrieve a representation of {@link NodeView}
* objects.
*
* Effectively this will be used to hold the state of the object in 6.x so there is no need to have 2 backing objects that
* represent the state of the Response. In practice these will always be read by a consumer as a NodeView, but it eases the
* transition to master which will not contain any representation of a {@link DiscoveryNode}.
*/
DiscoveryNode convertToDiscoveryNode() {
return new DiscoveryNode(name, nodeId, "", "", "", new TransportAddress(TransportAddress.META_ADDRESS, 0),
Collections.emptyMap(), Collections.emptySet(), Version.CURRENT);
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
NodeView other = (NodeView) obj;
return Objects.equals(nodeId, other.nodeId) &&
Objects.equals(name, other.name);
}
@Override
public int hashCode() {
return Objects.hash(nodeId, name);
}
}
private List<DiscoveryNode> nodes;
private ClusterName clusterName;
@ -45,53 +134,56 @@ public class VerifyRepositoryResponse extends ActionResponse implements ToXConte
public VerifyRepositoryResponse(ClusterName clusterName, DiscoveryNode[] nodes) {
this.clusterName = clusterName;
this.nodes = nodes;
this.nodes = Arrays.asList(nodes);
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
clusterName = new ClusterName(in);
nodes = new DiscoveryNode[in.readVInt()];
for (int i=0; i<nodes.length; i++){
nodes[i] = new DiscoveryNode(in);
if (in.getVersion().onOrAfter(Version.V_7_0_0_alpha1)) {
this.nodes = in.readList(NodeView::new).stream().map(n -> n.convertToDiscoveryNode()).collect(Collectors.toList());
} else {
clusterName = new ClusterName(in);
this.nodes = in.readList(DiscoveryNode::new);
}
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
clusterName.writeTo(out);
out.writeVInt(nodes.length);
for (DiscoveryNode node : nodes) {
node.writeTo(out);
if (Version.CURRENT.onOrAfter(Version.V_7_0_0_alpha1)) {
out.writeList(getNodes());
} else {
clusterName.writeTo(out);
out.writeList(nodes);
}
}
public DiscoveryNode[] getNodes() {
return nodes;
public List<NodeView> getNodes() {
return nodes.stream().map(dn -> new NodeView(dn.getId(), dn.getName())).collect(Collectors.toList());
}
public ClusterName getClusterName() {
return clusterName;
}
static final class Fields {
static final String NODES = "nodes";
static final String NAME = "name";
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
builder.startObject(Fields.NODES);
for (DiscoveryNode node : nodes) {
builder.startObject(node.getId());
builder.field(Fields.NAME, node.getName());
{
builder.startObject(NODES);
{
for (DiscoveryNode node : nodes) {
builder.startObject(node.getId());
{
builder.field(NAME, node.getName());
}
builder.endObject();
}
}
builder.endObject();
}
builder.endObject();
builder.endObject();
return builder;
}

2
server/src/test/java/org/elasticsearch/action/admin/cluster/repositories/RepositoryBlocksIT.java
View File

@ -67,7 +67,7 @@ public class RepositoryBlocksIT extends ESIntegTestCase {
try {
setClusterReadOnly(true);
VerifyRepositoryResponse response = client().admin().cluster().prepareVerifyRepository("test-repo-blocks").execute().actionGet();
assertThat(response.getNodes().length, equalTo(cluster().numDataAndMasterNodes()));
assertThat(response.getNodes().size(), equalTo(cluster().numDataAndMasterNodes()));
} finally {
setClusterReadOnly(false);
}

2
server/src/test/java/org/elasticsearch/action/admin/cluster/snapshots/SnapshotBlocksIT.java
View File

@ -73,7 +73,7 @@ public class SnapshotBlocksIT extends ESIntegTestCase {
logger.info("--> verify the repository");
VerifyRepositoryResponse verifyResponse = client().admin().cluster().prepareVerifyRepository(REPOSITORY_NAME).get();
assertThat(verifyResponse.getNodes().length, equalTo(cluster().numDataAndMasterNodes()));
assertThat(verifyResponse.getNodes().size(), equalTo(cluster().numDataAndMasterNodes()));
logger.info("--> create a snapshot");
CreateSnapshotResponse snapshotResponse = client().admin().cluster().prepareCreateSnapshot(REPOSITORY_NAME, SNAPSHOT_NAME)

2
server/src/test/java/org/elasticsearch/snapshots/RepositoriesIT.java
View File

@ -61,7 +61,7 @@ public class RepositoriesIT extends AbstractSnapshotIntegTestCase {
logger.info("--> verify the repository");
int numberOfFiles = FileSystemUtils.files(location).length;
VerifyRepositoryResponse verifyRepositoryResponse = client.admin().cluster().prepareVerifyRepository("test-repo-1").get();
assertThat(verifyRepositoryResponse.getNodes().length, equalTo(cluster().numDataAndMasterNodes()));
assertThat(verifyRepositoryResponse.getNodes().size(), equalTo(cluster().numDataAndMasterNodes()));
logger.info("--> verify that we didn't leave any files as a result of verification");
assertThat(FileSystemUtils.files(location).length, equalTo(numberOfFiles));