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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12084) Scheduled Count will not decrement when file is deleted before all IBR's received
Date Mon, 25 Sep 2017 14:15:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179080#comment-16179080
] 

Kihwal Lee commented on HDFS-12084:
-----------------------------------

I was looking at the 2.8 patch.
- Explicit calls to abandonBlock() : unprotectedRemoveBlock() will decrement it.
- Delete before commit : not covered?
- Delete after commit : this jira
- Abandoned. Lease recovery and commitBlockSynchronization() will take care of it.
- pipeline updates (i.e. abandoned replicas): not covered?

It feels that we need to improve deletion path to take care of both before and after commit
cases. We need to think a bit more about pipeline updates.

> Scheduled Count will not decrement when file is deleted before all IBR's received
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-12084
>                 URL: https://issues.apache.org/jira/browse/HDFS-12084
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>         Attachments: HDFS-12084-001.patch, HDFS-12084-002.patch, HDFS-12084-003.patch,
HDFS-12084-branch-2.patch
>
>
> When small files creation && deletion happens so frequently and DN's did not
report blocks to NN before deletion, then scheduled count will keep on increment and which
will not deleted as blocks are deleted.
> *Note*: Every 20 mins,this can be rolled, but with in 20 mins, count can be more as so
many operations.
> when batchIBR enabled with committed allowed=1 this will be observed more.



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