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https://issues.apache.org/jira/browse/HDFS-15900?focusedWorklogId=568728&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-568728
]
ASF GitHub Bot logged work on HDFS-15900:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Mar/21 01:46
Start Date: 19/Mar/21 01:46
Worklog Time Spent: 10m
Work Description: hdaikoku commented on a change in pull request #2787:
URL: https://github.com/apache/hadoop/pull/2787#discussion_r597352892
##########
File path:
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/resolver/TestFederationNamespaceInfo.java
##########
@@ -0,0 +1,39 @@
+/*
+ * 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.hdfs.server.federation.resolver;
+
+import org.junit.Test;
+
+import java.util.Set;
+import java.util.TreeSet;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class TestFederationNamespaceInfo {
+ /**
+ * Regression test for HDFS-15900.
Review comment:
Provided courtesy of @aajisaka
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Issue Time Tracking
-------------------
Worklog Id: (was: 568728)
Time Spent: 20m (was: 10m)
> RBF: empty blockpool id on dfsrouter caused by UNAVAILABLE NameNode
> -------------------------------------------------------------------
>
> Key: HDFS-15900
> URL: https://issues.apache.org/jira/browse/HDFS-15900
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: rbf
> Affects Versions: 3.3.0
> Reporter: Harunobu Daikoku
> Assignee: Harunobu Daikoku
> Priority: Major
> Labels: pull-request-available
> Attachments: image.png
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> We observed that when a NameNode becomes UNAVAILABLE, the corresponding
> blockpool id in MembershipStoreImpl#activeNamespaces on dfsrouter
> unintentionally sets to empty, its initial value.
> !image.png|height=250!
> As a result of this, concat operations through dfsrouter fail with the
> following error as it cannot resolve the block id in the recognized active
> namespaces.
> {noformat}
> Caused by:
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RemoteException):
> Cannot locate a nameservice for block pool BP-...
> {noformat}
> A possible fix is to ignore UNAVAILABLE NameNode registrations, and set
> proper namespace information obtained from available NameNode registrations
> when constructing the cache of active namespaces.
>
> [https://github.com/apache/hadoop/blob/rel/release-3.3.0/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/impl/MembershipStoreImpl.java#L207-L221]
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