complone commented on a change in pull request #13068:
URL: https://github.com/apache/pulsar/pull/13068#discussion_r760791529
##########
File path:
pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/EtcdMetadataStore.java
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@@ -0,0 +1,80 @@
+package org.apache.pulsar.metadata.impl;
+
+import io.etcd.jetcd.Client;
+import io.etcd.jetcd.KV;
+import io.etcd.jetcd.Lease;
+import io.etcd.jetcd.Watch;
+import org.apache.pulsar.metadata.api.GetResult;
+import org.apache.pulsar.metadata.api.MetadataStoreConfig;
+import org.apache.pulsar.metadata.api.Stat;
+import org.apache.pulsar.metadata.api.extended.CreateOption;
+import org.apache.pulsar.metadata.api.extended.MetadataStoreExtended;
+
+import java.time.temporal.ChronoUnit;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+public class EtcdMetadataStore extends AbstractMetadataStore implements
MetadataStoreExtended {
+
+ //与bookie client保持通信的组件
+ private Client client;
+ //存储数据用的抽象
+ private KV kvClient;
+ //用于节点实例在定期watch之后进行续租
+ private Lease leaseClient;
+ //类似于zk当中的节点状态同步
+ private Watch watchClient;
+
+
+
+ public EtcdMetadataStore(String metadataURL, MetadataStoreConfig
metadataStoreConfig){
+ this.client = Client.builder().endpoints(metadataURL)
+
.maxInboundMessageSize(metadataStoreConfig.getMaxInboundMessageSize())
+ .retryChronoUnit(ChronoUnit.MINUTES)
+ .retryMaxDuration(metadataStoreConfig.getRetryMaxDuration())
+ .retryDelay(metadataStoreConfig.getRetryDelay())
+ .build();
+
+ this.kvClient = client.getKVClient();
+ this.leaseClient = client.getLeaseClient();
+
+
+ }
+
+ @Override
+ public CompletableFuture<Optional<GetResult>> get(String path) {
Review comment:
enmm...Yes, it is WIP
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