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https://issues.apache.org/jira/browse/HDFS-14465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16866064#comment-16866064
]
Hudson commented on HDFS-14465:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #16761 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16761/])
HDFS-14465. When the Block expected replications is larger than the (weichiu:
rev f9a7b442fdd7855e3c7b28e19a12580df48d92bf)
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminManager.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestMaintenanceState.java
> When the Block expected replications is larger than the number of DataNodes,
> entering maintenance will never exit.
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14465
> URL: https://issues.apache.org/jira/browse/HDFS-14465
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.9.2
> Reporter: Yicong Cai
> Assignee: Yicong Cai
> Priority: Major
> Fix For: 3.0.4, 3.3.0, 3.2.1, 3.1.3
>
> Attachments: HDFS-14465.01.patch, HDFS-14465.02.patch
>
>
> Scenes:
> There is a small HDFS cluster with 5 DataNodes; one of them is maintained,
> added to the maintenance list, and set
> dfs.namenode.maintenance.replication.min to 1.
> When refresh Nodes, the NameNode starts checking whether the blocks on the
> node require a new replication.
> The replications of the MapReduce task job file is 10 by default,
> isNeededReplicationForMaintenance will determine to false, and
> isSufficientlyReplicated will determine to false, so the block of the job
> file needs to increase the replication.
> When adding a replication, since the cluster has only 5 DataNodes, all the
> nodes have the replications of the block, chooseTargetInOrder will throw a
> NotEnoughReplicasException, so that the replication cannot be increase, and
> the Entering Maintenance cannot be ended.
> This issue will cause the independent small cluster to be unable to use the
> maintenance mode.
>
> {panel:title=chooseTarget exception log}
> 2019-05-03 23:42:31,008 [31545331] - WARN
> [ReplicationMonitor:BlockPlacementPolicyDefault@431] - Failed to place enough
> replicas, still in need of 1 to reach 5 (unavailableStorages=[],
> storagePolicy=BlockStoragePolicy\{HOT:7, storageTypes=[DISK],
> creationFallbacks=[], replicationFallbacks=[ARCHIVE]}, newBlock=false) For
> more information, please enable DEBUG log level on
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy and
> org.apache.hadoop.net.NetworkTopology
> {panel}
>
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