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Add delete_device support #32

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Add delete_device support #32

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Commits on Oct 29, 2013

  1. MogileFS::Worker can handle incoming cmd 'delete_device'

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  2. MogileFS::Store can delete device from database 

    with correct devid and hostid
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Commits on Oct 30, 2013

  1. dbh should be hidden in Store.pm

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  2. ensure the device is marked as dead before deleting

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  3. file_to_device returns file count will migrate to specified device

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  4. ensure no files is going to specified device before deleting

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  5. sort the order to validate the deleting of device

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  6. mark DONE on implemented items

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Commits on Oct 31, 2013

  1. delete_device() keeps primary key of device to prevent reuse. 

    just set it hostid = 0 to make it belong to no host.
get_all_devices() returns devices which hostid > 0
to avoid interactions with deleted devices.
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