[jira] [Comment Edited] (OAK-4873) Avoid running GC too frequently

["Michael Dürig (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-4873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15767254#comment-15767254 ] 

Michael Dürig edited comment on OAK-4873 at 12/21/16 3:47 PM:
--------------------------------------------------------------

Fixed at http://svn.apache.org/viewvc?rev=1775464&view=rev. 

If {{FileStore.gc()}} is now invoked more than once per 10 hours a warning will be logged and gc will be skipped:

{noformat}
TarMK GC #2: skipping garbage collection as it already ran less than 10 hours ago (32 s).
{noformat}

The default backoff time of 10 hours can be set for debugging purposes via the {{oak.gc.backoff}} feature flag. 


was (Author: mduerig):
Fixed at http://svn.apache.org/viewvc?rev=1775464&view=rev. 

If {{FileStore.gc()}} is now invoked more than once per 10 hours a warning will be logged and gc will be skipped:

{noformat}
TarMK GC #2: skipping garbage collection as it already ran less than 10 hours ago (32 s).
{noformat}

The default backoff time of 10 hours can be set for debugging purposes via the {{gc.backoff}} feature flag. 

> Avoid running GC too frequently
> -------------------------------
>
>                 Key: OAK-4873
>                 URL: https://issues.apache.org/jira/browse/OAK-4873
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar
>    Affects Versions: Segment Tar 0.0.16
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>            Priority: Blocker
>              Labels: compaction, gc
>             Fix For: 1.5.17
>
>
> As {{RevisionGCMBean.startRevisionGC()}} can be used to manually invoke a gc cycle, there is the danger of running into a {{SNFE}} when gc is run multiple times in quick succession (due to the retention time being based on number of generations). We should come up with a mechanism to prevent this scenario. 



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