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https://issues.apache.org/jira/browse/ZOOKEEPER-1994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085361#comment-14085361
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Hongchao Deng commented on ZOOKEEPER-1994:
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Besides removing "configBackwardCompatibilityMode" in QuorumPeerConfig, I also
realized there is "configBackwardCompatibility" in QuorumPeer which is used in
this logic:
{code}
// we need to write the dynamic config file. Either it already
exists
// or we have the old-style config file and we're in the backward
compatibility mode,
// so we'll create the dynamic config file for the first time now
if (dynamicConfigFilename != null || (configFilename != null &&
configBackwardCompatibility)) {
{code}
[~shralex] Could you explain the logic here? I am thinking about removing that
"configBackwardCompatibility" as well. What changes should be made?
> 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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