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https://issues.apache.org/jira/browse/HDFS-14989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-14989 started by Aravindan Vijayan.
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> Add a 'swapBlockList' operation to Namenode.
> --------------------------------------------
>
> Key: HDFS-14989
> URL: https://issues.apache.org/jira/browse/HDFS-14989
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Aravindan Vijayan
> Assignee: Aravindan Vijayan
> Priority: Major
>
> Borrowing from the design doc.
> bq. The swapBlockList takes two parameters, a source file and a destination
> file. This operation swaps the blocks belonging to the source and the
> destination atomically.
> bq. The namespace metadata of interest is the INodeFile class. A file
> (INodeFile) contains a header composed of PREFERRED_BLOCK_SIZE,
> BLOCK_LAYOUT_AND_REDUNDANCY and STORAGE_POLICY_ID. In addition, an INodeFile
> contains a list of blocks (BlockInfo[]). The operation will swap
> BLOCK_LAYOUT_AND_REDUNDANCY header bits and the block lists. But it will not
> touch other fields. To avoid complication, this operation will abort if
> either file is open (isUnderConstruction() == true)
> bq. Additionally, this operation introduces a new opcode OP_SWAP_BLOCK_LIST
> to record the change persistently.
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