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Posted to oak-issues@jackrabbit.apache.org by "Alex Parvulescu (JIRA)" <ji...@apache.org> on 2016/10/26 07:07:58 UTC

[jira] [Commented] (OAK-5004) Offline compaction explodes checkpoints

    [ https://issues.apache.org/jira/browse/OAK-5004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15607673#comment-15607673 ] 

Alex Parvulescu commented on OAK-5004:
--------------------------------------

we originally had the compaction map, and more recently the node deduplication cache. checkpoints usually consist of links to the root state, so most of the nodes under a checkpoint should already by present in the deduplication cache. 

> Offline compaction explodes checkpoints 
> ----------------------------------------
>
>                 Key: OAK-5004
>                 URL: https://issues.apache.org/jira/browse/OAK-5004
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar
>            Reporter: Michael Dürig
>              Labels: compaction, gc, tooling
>             Fix For: Segment Tar 0.0.20
>
>
> Running offline compaction on a repository with checkpoints will explode those into full copies. Observed e.g. with OAK-5001. 
> I think we should consider improving this by compacting checkpoints on top of each other in the proper order ({{oak-upgrade}} does this successfully). 
> [~alex.parvulescu], WDYT? What was our take on this in the previous Oak versions? 



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