Yongjun Zhang commented on HDFS-12217:

Hi [~manojg] and [~jojochuang],

Thanks for continuing to drive on this when I was out. I am glad to see that we 
have converged on the solution.

> HDFS snapshots doesn't capture all open files when one of the open files is 
> deleted
> -----------------------------------------------------------------------------------
>                 Key: HDFS-12217
>                 URL: https://issues.apache.org/jira/browse/HDFS-12217
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Manoj Govindassamy
>            Assignee: Manoj Govindassamy
>             Fix For: 2.9.0, 3.0.0-beta1
>         Attachments: HDFS-12217.01.patch, HDFS-12217.02.patch, 
> HDFS-12217.03.patch, HDFS-12217.04.patch, HDFS-12217.05.patch
> With the fix for HDFS-11402, HDFS Snapshots can additionally capture all the 
> open files. Just like all other files, these open files in the snapshots will 
> remain immutable. But, sometimes it is found that snapshots fail to capture 
> all the open files in the system.
> Under the following conditions, LeaseManager will fail to find INode 
> corresponding to an active lease 
> * a file is opened for writing (LeaseManager allots a lease), and
> * the same file is deleted while it is still open for writing and having 
> active lease, and
> * the same file is not referenced in any other Snapshots/Trash
> {{INode[] LeaseManager#getINodesWithLease()}} can thus return null for few 
> leases there by causing the caller to trip over and not return all the open 
> files needed by the snapshot manager.

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