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https://issues.apache.org/jira/browse/HDDS-10770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sammi Chen resolved HDDS-10770.
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Fix Version/s: 1.5.0
Resolution: Fixed
> [Hsync] Allow overwrite hsynced file
> ------------------------------------
>
> Key: HDDS-10770
> URL: https://issues.apache.org/jira/browse/HDDS-10770
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Sammi Chen
> Assignee: Sammi Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.5.0
>
> Attachments: screenshot-1.png
>
>
> Case1
> 1. client1 open fileA with block1, write some data
> 2. client2 open fileA with block2, write some data
> 3. client1 close fileA
> 4. client2 close fileA
> Expected result:
> fileA with block2 in keyTable // final fileA data is block2
> fileA with block1 in deletedKeyTable // block1 is deleted
> Case2
> 1. client1 open fileA with block1, write some data
> 2. client2 open fileA with block2, write some data, call hsync, close fileA
> 3. client1 close fileA
> Expected result:
> fileA with block1 in keyTable // final fileA data is block1
> fileA with block2 in deletedKeyTable // block2 is deleted
> Case3:
> 1. client1 open fileA with block1, write some data
> 2. client2 open fileA with block2, write some data, call hsync
> 3. client1 close fileA
> 4. client2 close fileA
> Expected result:
> fileA with block1 in keyTable // final fileA data is block1
> client2 close fileA should fail
> fileA with block2 in deletedKeyTable // block2 is deleted
> Case4:
> 1. client1 open fileA with block1, write some data, call hsync
> 2. client2 open fileA with block2, write some data, call hsync
> 3. client1 close fileA
> 4. client2 close fileA
> Expected result:
> client1 close call will fail while client2 close will succeed.
> final fileA data is block2, block1 will be delted.
> !screenshot-1.png!
> The overall rule is
> a. the later commit overwrites early commit
> b. avoid mutual overwrites. Once a file is overwritten, it cannot later
> overwritten others again.
> To support this, when a hsynced file is overwritten, it will have
> "overwritten" metadata as a flag. All following allocate block, further hsync
> or commit of this file will fail.
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