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https://issues.apache.org/jira/browse/ZOOKEEPER-1994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14082426#comment-14082426
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Hongchao Deng commented on ZOOKEEPER-1994:
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Just to clarify, this issue contains two parts:
1. Backup static config. It happens twice
{quote}
once when removing the ensemble definitions, at which point a dynamic file
doesn't exist yet, and once when removing clientPort information
{quote}
2. Backup dynamic file. It happens when a new dynamic is created on reconfig.
[~shralex]
Your options are applied to dynamic files. I think it also applies to static
files. I prefer sequence number (we can save the zxid in file).
One questions: where should those backup stay? What about creating a new
directory in "data/"?
> 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: 3.5.0
>
>
> 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.
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