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https://issues.apache.org/jira/browse/HDFS-17556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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caozhiqiang updated HDFS-17556:
-------------------------------
Status: Patch Available (was: In Progress)
> Avoid adding block to neededReconstruction repeatedly in decommission
> ---------------------------------------------------------------------
>
> Key: HDFS-17556
> URL: https://issues.apache.org/jira/browse/HDFS-17556
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namanode
> Affects Versions: 3.5.0
> Reporter: caozhiqiang
> Assignee: caozhiqiang
> Priority: Major
>
> In decommission and maintenance process, before added to
> BlockManager::neededReconstruction block will be check if it has been added.
> The check contains if block is in BlockManager::neededReconstruction or in
> PendingReconstructionBlocks::pendingReconstructions as below code.
> But it also need to check if it is in
> PendingReconstructionBlocks::timedOutItems. Or else
> DatanodeAdminDefaultMonitor will add block to
> BlockManager::neededReconstruction repeatedly if block time out in
> PendingReconstructionBlocks::pendingReconstructions.
>
> {code:java}
> if (!blockManager.neededReconstruction.contains(block) &&
> blockManager.pendingReconstruction.getNumReplicas(block) == 0 &&
> blockManager.isPopulatingReplQueues()) {
> // Process these blocks only when active NN is out of safe mode.
> blockManager.neededReconstruction.add(block,
> liveReplicas, num.readOnlyReplicas(),
> num.outOfServiceReplicas(),
> blockManager.getExpectedRedundancyNum(block));
> } {code}
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