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https://issues.apache.org/jira/browse/ZOOKEEPER-1994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085744#comment-14085744
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Hongchao Deng commented on ZOOKEEPER-1994:
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I rethought the version thing a bit more.
It seems to me too hackish to parse the "version" number from filename.
My original proposal was to have some sort of backup with a history view. The
reason I suggest separating version out is that I am concerned when users copy
dynamic files around and boot it up, they didn't realize the version inside is
important. I was suggesting to separate version apart to another related file,
and if a dynamic file doesn't have any version related to it, it is version 0.
I don't know where to go here. As a compromise to what we have done so far, I
would like to keep "version" still in dynamic file and everything is still what
[~shralex] suggested:
1. have version appended to filename (not parsed from filename)
2. update static config to point to new dynamic file.
> Backup config files.
> --------------------
>
> Key: ZOOKEEPER-1994
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1994
> Project: ZooKeeper
> Issue Type: Improvement
> Affects Versions: 3.5.0
> Reporter: Hongchao Deng
> Assignee: Hongchao Deng
> Fix For: 3.5.1
>
> Attachments: draft.patch, first-try.patch, static-backup.patch
>
>
> We should create a backup file for a static or dynamic configuration file
> before changing the file.
> Since the static file is changed at most twice (once when removing the
> ensemble definitions, at which point a dynamic file doesn't exist yet, and
> once when removing clientPort information) its probably fine to back up the
> static file independently from the dynamic file.
> To track backup history:
> Option 1: we could have a .bakXX extention for backup where XX is a sequence
> number.
> Option 2: have the configuration version be part of the file name for dynamic
> configuration files (instead of in the file like now). Such as
> zoo_replicated1.cfg.dynamic.1000000 then on reconfiguration simply create a
> new dynamic file (with new version) and update the link in the static file to
> point to the new dynamic one.
> Review place:
> https://reviews.apache.org/r/24208/
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