You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@ozone.apache.org by GitBox <gi...@apache.org> on 2020/10/22 08:31:00 UTC

[GitHub] [hadoop-ozone] timmylicheng opened a new pull request #1514: HDDS-4191 Add failover proxy for SCM container location.

timmylicheng opened a new pull request #1514:
URL: https://github.com/apache/hadoop-ozone/pull/1514


   ## What changes were proposed in this pull request?
   Add failover proxy for SCM container client
   (Please fill in changes proposed in this fix)
   
   ## What is the link to the Apache JIRA
   https://issues.apache.org/jira/browse/HDDS-4191
   (Please create an issue in ASF JIRA before opening a pull request,
   and you need to set the title of the pull request which starts with
   the corresponding JIRA issue number. (e.g. HDDS-XXXX. Fix a typo in YYY.)
   
   Please replace this section with the link to the Apache JIRA)
   
   ## How was this patch tested?
   UT
   (Please explain how this patch was tested. Ex: unit tests, manual tests)
   (If this patch involves UI changes, please attach a screen-shot; otherwise, remove this)
   


----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org



---------------------------------------------------------------------
To unsubscribe, e-mail: ozone-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: ozone-issues-help@hadoop.apache.org


[GitHub] [hadoop-ozone] xiaoyuyao commented on a change in pull request #1514: HDDS-4191 Add failover proxy for SCM container location.

Posted by GitBox <gi...@apache.org>.
xiaoyuyao commented on a change in pull request #1514:
URL: https://github.com/apache/hadoop-ozone/pull/1514#discussion_r510497229



##########
File path: hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/scm/proxy/SCMContainerLocationFailoverProxyProvider.java
##########
@@ -0,0 +1,284 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdds.scm.proxy;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.conf.ConfigurationSource;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolPB;
+import org.apache.hadoop.hdds.utils.LegacyHadoopConfigurationSource;
+import org.apache.hadoop.io.retry.FailoverProxyProvider;
+import org.apache.hadoop.io.retry.RetryPolicy;
+import org.apache.hadoop.ipc.ProtobufRpcEngine;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import static org.apache.hadoop.hdds.HddsUtils.getHostName;
+import static org.apache.hadoop.hdds.HddsUtils.getPortNumberFromConfigKeys;
+import static org.apache.hadoop.hdds.HddsUtils.getScmAddressForClients;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_NAMES;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_SERVICE_IDS_KEY;
+
+/**
+ * Failover proxy provider for SCM container location.
+ */
+public class SCMContainerLocationFailoverProxyProvider implements
+    FailoverProxyProvider<StorageContainerLocationProtocolPB>, Closeable {
+  public static final Logger LOG =
+      LoggerFactory.getLogger(StorageContainerLocationProtocolPB.class);

Review comment:
       LOG name should be SCMContainerLocationFailoverProxyProvider.class.




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org



---------------------------------------------------------------------
To unsubscribe, e-mail: ozone-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: ozone-issues-help@hadoop.apache.org


[GitHub] [hadoop-ozone] timmylicheng closed pull request #1514: HDDS-4191 Add failover proxy for SCM container location.

Posted by GitBox <gi...@apache.org>.
timmylicheng closed pull request #1514:
URL: https://github.com/apache/hadoop-ozone/pull/1514


   


----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org



---------------------------------------------------------------------
To unsubscribe, e-mail: ozone-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: ozone-issues-help@hadoop.apache.org


[GitHub] [hadoop-ozone] codecov-io commented on pull request #1514: HDDS-4191 Add failover proxy for SCM container location.

Posted by GitBox <gi...@apache.org>.
codecov-io commented on pull request #1514:
URL: https://github.com/apache/hadoop-ozone/pull/1514#issuecomment-714483581


   # [Codecov](https://codecov.io/gh/apache/hadoop-ozone/pull/1514?src=pr&el=h1) Report
   > Merging [#1514](https://codecov.io/gh/apache/hadoop-ozone/pull/1514?src=pr&el=desc) into [HDDS-2823](https://codecov.io/gh/apache/hadoop-ozone/commit/7ddaa07d7de696c71113670c2f092cbc14f06658?el=desc) will **decrease** coverage by `0.02%`.
   > The diff coverage is `74.61%`.
   
   [![Impacted file tree graph](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/graphs/tree.svg?width=650&height=150&src=pr&token=5YeeptJMby)](https://codecov.io/gh/apache/hadoop-ozone/pull/1514?src=pr&el=tree)
   
   ```diff
   @@               Coverage Diff               @@
   ##             HDDS-2823    #1514      +/-   ##
   ===============================================
   - Coverage        73.76%   73.74%   -0.03%     
   - Complexity       10466    10489      +23     
   ===============================================
     Files             1002     1003       +1     
     Lines            51756    51857     +101     
     Branches          5008     5019      +11     
   ===============================================
   + Hits             38180    38241      +61     
   - Misses           11170    11205      +35     
   - Partials          2406     2411       +5     
   ```
   
   
   | [Impacted Files](https://codecov.io/gh/apache/hadoop-ozone/pull/1514?src=pr&el=tree) | Coverage Δ | Complexity Δ | |
   |---|---|---|---|
   | [...ntainerLocationProtocolServerSideTranslatorPB.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLWhkZHMvc2VydmVyLXNjbS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvaGFkb29wL2hkZHMvc2NtL3Byb3RvY29sL1N0b3JhZ2VDb250YWluZXJMb2NhdGlvblByb3RvY29sU2VydmVyU2lkZVRyYW5zbGF0b3JQQi5qYXZh) | `53.16% <14.28%> (-1.19%)` | `26.00 <2.00> (+1.00)` | :arrow_down: |
   | [...oxy/SCMContainerLocationFailoverProxyProvider.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLWhkZHMvZnJhbWV3b3JrL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9oYWRvb3AvaGRkcy9zY20vcHJveHkvU0NNQ29udGFpbmVyTG9jYXRpb25GYWlsb3ZlclByb3h5UHJvdmlkZXIuamF2YQ==) | `76.85% <76.85%> (ø)` | `22.00 <22.00> (?)` | |
   | [...ntainerLocationProtocolClientSideTranslatorPB.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLWhkZHMvZnJhbWV3b3JrL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9oYWRvb3AvaGRkcy9zY20vcHJvdG9jb2xQQi9TdG9yYWdlQ29udGFpbmVyTG9jYXRpb25Qcm90b2NvbENsaWVudFNpZGVUcmFuc2xhdG9yUEIuamF2YQ==) | `54.70% <80.00%> (-0.39%)` | `28.00 <2.00> (ø)` | |
   | [...m/proxy/SCMBlockLocationFailoverProxyProvider.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLWhkZHMvZnJhbWV3b3JrL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9oYWRvb3AvaGRkcy9zY20vcHJveHkvU0NNQmxvY2tMb2NhdGlvbkZhaWxvdmVyUHJveHlQcm92aWRlci5qYXZh) | `75.45% <100.00%> (ø)` | `22.00 <0.00> (ø)` | |
   | [.../hadoop/hdds/scm/cli/ContainerOperationClient.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLWhkZHMvdG9vbHMvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL2hhZG9vcC9oZGRzL3NjbS9jbGkvQ29udGFpbmVyT3BlcmF0aW9uQ2xpZW50LmphdmE=) | `36.97% <100.00%> (-4.89%)` | `14.00 <1.00> (ø)` | |
   | [.../java/org/apache/hadoop/ozone/om/OzoneManager.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLW96b25lL296b25lLW1hbmFnZXIvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL2hhZG9vcC9vem9uZS9vbS9Pem9uZU1hbmFnZXIuamF2YQ==) | `68.12% <100.00%> (-0.17%)` | `207.00 <0.00> (ø)` | |
   | [...ache/hadoop/ozone/recon/ReconControllerModule.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLW96b25lL3JlY29uL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9oYWRvb3Avb3pvbmUvcmVjb24vUmVjb25Db250cm9sbGVyTW9kdWxlLmphdmE=) | `81.33% <100.00%> (+1.84%)` | `6.00 <0.00> (ø)` | |
   | [...ache/hadoop/ozone/om/codec/S3SecretValueCodec.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLW96b25lL296b25lLW1hbmFnZXIvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL2hhZG9vcC9vem9uZS9vbS9jb2RlYy9TM1NlY3JldFZhbHVlQ29kZWMuamF2YQ==) | `90.90% <0.00%> (-9.10%)` | `3.00% <0.00%> (-1.00%)` | |
   | [...va/org/apache/hadoop/hdds/utils/db/RDBMetrics.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLWhkZHMvZnJhbWV3b3JrL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9oYWRvb3AvaGRkcy91dGlscy9kYi9SREJNZXRyaWNzLmphdmE=) | `92.85% <0.00%> (-7.15%)` | `14.00% <0.00%> (-1.00%)` | |
   | [...ozone/container/ozoneimpl/ContainerController.java](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree#diff-aGFkb29wLWhkZHMvY29udGFpbmVyLXNlcnZpY2Uvc3JjL21haW4vamF2YS9vcmcvYXBhY2hlL2hhZG9vcC9vem9uZS9jb250YWluZXIvb3pvbmVpbXBsL0NvbnRhaW5lckNvbnRyb2xsZXIuamF2YQ==) | `76.31% <0.00%> (-5.27%)` | `13.00% <0.00%> (-1.00%)` | |
   | ... and [26 more](https://codecov.io/gh/apache/hadoop-ozone/pull/1514/diff?src=pr&el=tree-more) | |
   
   ------
   
   [Continue to review full report at Codecov](https://codecov.io/gh/apache/hadoop-ozone/pull/1514?src=pr&el=continue).
   > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
   > `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
   > Powered by [Codecov](https://codecov.io/gh/apache/hadoop-ozone/pull/1514?src=pr&el=footer). Last update [7ddaa07...31ce4f6](https://codecov.io/gh/apache/hadoop-ozone/pull/1514?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
   


----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org



---------------------------------------------------------------------
To unsubscribe, e-mail: ozone-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: ozone-issues-help@hadoop.apache.org


[GitHub] [hadoop-ozone] timmylicheng commented on a change in pull request #1514: HDDS-4191 Add failover proxy for SCM container location.

Posted by GitBox <gi...@apache.org>.
timmylicheng commented on a change in pull request #1514:
URL: https://github.com/apache/hadoop-ozone/pull/1514#discussion_r510791922



##########
File path: hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/scm/proxy/SCMContainerLocationFailoverProxyProvider.java
##########
@@ -0,0 +1,284 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdds.scm.proxy;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.conf.ConfigurationSource;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolPB;
+import org.apache.hadoop.hdds.utils.LegacyHadoopConfigurationSource;
+import org.apache.hadoop.io.retry.FailoverProxyProvider;
+import org.apache.hadoop.io.retry.RetryPolicy;
+import org.apache.hadoop.ipc.ProtobufRpcEngine;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import static org.apache.hadoop.hdds.HddsUtils.getHostName;
+import static org.apache.hadoop.hdds.HddsUtils.getPortNumberFromConfigKeys;
+import static org.apache.hadoop.hdds.HddsUtils.getScmAddressForClients;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_NAMES;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_SERVICE_IDS_KEY;
+
+/**
+ * Failover proxy provider for SCM container location.
+ */
+public class SCMContainerLocationFailoverProxyProvider implements
+    FailoverProxyProvider<StorageContainerLocationProtocolPB>, Closeable {
+  public static final Logger LOG =
+      LoggerFactory.getLogger(StorageContainerLocationProtocolPB.class);
+
+  private Map<String, ProxyInfo<StorageContainerLocationProtocolPB>> scmProxies;
+  private Map<String, SCMProxyInfo> scmProxyInfoMap;
+  private List<String> scmNodeIDList;
+
+  private String currentProxySCMNodeId;
+  private int currentProxyIndex;
+
+  private final ConfigurationSource conf;
+  private final SCMClientConfig scmClientConfig;
+  private final long scmVersion;
+
+  private final String scmServiceId;
+
+  private final int maxRetryCount;
+  private final long retryInterval;
+
+  public static final String SCM_DUMMY_NODEID_PREFIX = "scm";
+
+  public SCMContainerLocationFailoverProxyProvider(ConfigurationSource conf) {
+    this.conf = conf;
+    this.scmVersion = RPC.getProtocolVersion(
+        StorageContainerLocationProtocolPB.class);
+    this.scmServiceId = conf.getTrimmed(OZONE_SCM_SERVICE_IDS_KEY);

Review comment:
       Wanted to keep it as final variable so that value is only set in constructor. What do you think?

##########
File path: hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/scm/proxy/SCMContainerLocationFailoverProxyProvider.java
##########
@@ -0,0 +1,284 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdds.scm.proxy;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.conf.ConfigurationSource;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolPB;
+import org.apache.hadoop.hdds.utils.LegacyHadoopConfigurationSource;
+import org.apache.hadoop.io.retry.FailoverProxyProvider;
+import org.apache.hadoop.io.retry.RetryPolicy;
+import org.apache.hadoop.ipc.ProtobufRpcEngine;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import static org.apache.hadoop.hdds.HddsUtils.getHostName;
+import static org.apache.hadoop.hdds.HddsUtils.getPortNumberFromConfigKeys;
+import static org.apache.hadoop.hdds.HddsUtils.getScmAddressForClients;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_NAMES;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_SERVICE_IDS_KEY;
+
+/**
+ * Failover proxy provider for SCM container location.
+ */
+public class SCMContainerLocationFailoverProxyProvider implements
+    FailoverProxyProvider<StorageContainerLocationProtocolPB>, Closeable {
+  public static final Logger LOG =
+      LoggerFactory.getLogger(StorageContainerLocationProtocolPB.class);

Review comment:
       Updated.




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org



---------------------------------------------------------------------
To unsubscribe, e-mail: ozone-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: ozone-issues-help@hadoop.apache.org


[GitHub] [hadoop-ozone] xiaoyuyao commented on a change in pull request #1514: HDDS-4191 Add failover proxy for SCM container location.

Posted by GitBox <gi...@apache.org>.
xiaoyuyao commented on a change in pull request #1514:
URL: https://github.com/apache/hadoop-ozone/pull/1514#discussion_r510581749



##########
File path: hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/scm/proxy/SCMContainerLocationFailoverProxyProvider.java
##########
@@ -0,0 +1,284 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdds.scm.proxy;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.conf.ConfigurationSource;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolPB;
+import org.apache.hadoop.hdds.utils.LegacyHadoopConfigurationSource;
+import org.apache.hadoop.io.retry.FailoverProxyProvider;
+import org.apache.hadoop.io.retry.RetryPolicy;
+import org.apache.hadoop.ipc.ProtobufRpcEngine;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import static org.apache.hadoop.hdds.HddsUtils.getHostName;
+import static org.apache.hadoop.hdds.HddsUtils.getPortNumberFromConfigKeys;
+import static org.apache.hadoop.hdds.HddsUtils.getScmAddressForClients;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_NAMES;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_SERVICE_IDS_KEY;
+
+/**
+ * Failover proxy provider for SCM container location.
+ */
+public class SCMContainerLocationFailoverProxyProvider implements
+    FailoverProxyProvider<StorageContainerLocationProtocolPB>, Closeable {
+  public static final Logger LOG =
+      LoggerFactory.getLogger(StorageContainerLocationProtocolPB.class);
+
+  private Map<String, ProxyInfo<StorageContainerLocationProtocolPB>> scmProxies;
+  private Map<String, SCMProxyInfo> scmProxyInfoMap;
+  private List<String> scmNodeIDList;
+
+  private String currentProxySCMNodeId;
+  private int currentProxyIndex;
+
+  private final ConfigurationSource conf;
+  private final SCMClientConfig scmClientConfig;
+  private final long scmVersion;
+
+  private final String scmServiceId;
+
+  private final int maxRetryCount;
+  private final long retryInterval;
+
+  public static final String SCM_DUMMY_NODEID_PREFIX = "scm";
+
+  public SCMContainerLocationFailoverProxyProvider(ConfigurationSource conf) {
+    this.conf = conf;
+    this.scmVersion = RPC.getProtocolVersion(
+        StorageContainerLocationProtocolPB.class);
+    this.scmServiceId = conf.getTrimmed(OZONE_SCM_SERVICE_IDS_KEY);

Review comment:
       Can we move line 82 into loadConfigs()?




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org



---------------------------------------------------------------------
To unsubscribe, e-mail: ozone-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: ozone-issues-help@hadoop.apache.org