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https://issues.apache.org/jira/browse/KNOX-2844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17640497#comment-17640497
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ASF subversion and git services commented on KNOX-2844:
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Commit 616a4e06e8c24c6ba65250d4f853851d6a7d81b9 in knox's branch
refs/heads/master from Attila Magyar
[ https://gitbox.apache.org/repos/asf?p=knox.git;h=616a4e06e ]
KNOX-2844 - Remote config monitor should not automatically delete local files
if they're missing from the DB (#680)
> Remote config monitor should not automatically delete local files if they're
> missing from the DB
> ------------------------------------------------------------------------------------------------
>
> Key: KNOX-2844
> URL: https://issues.apache.org/jira/browse/KNOX-2844
> Project: Apache Knox
> Issue Type: Sub-task
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Somehow we might need to differentiate between topologies which are
> externally managed and topologies which are synced by the DB monitor.
> Otherwise every hand deployed topology are getting deleted after enabling
> this feature with an empty DB.
> By using logical deletes we can avoid unwanted local file removals. This
> implementation is more similar than the ZK based implementation where the
> delete event is generated by zookeeper, so if something never existed in ZK
> it will never be deleted from the file system.
> The DB based implementation uses polling because we don't have these kind of
> events (onDelete/onUpdate/onCreate). Originally the SQL based monitor removed
> all the local files which were missing from the DB. But if we switch to
> logical deletes, we can make sure that a file is only getting deleted if they
> were previously added then (logically) removed from the DB.
> After a certain period, we can do a full cleanup on the table and do physical
> removals on older, logiacally deleted records).
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