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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-2498) Root record references provide too little context for parsing a segment
Date Mon, 03 Oct 2016 13:02:20 GMT

    [ https://issues.apache.org/jira/browse/OAK-2498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15542376#comment-15542376
] 

Alex Parvulescu commented on OAK-2498:
--------------------------------------

fyi based on the latest changes on this issue, there's a size regression we need to consider
again (see  [this for reference|https://issues.apache.org/jira/browse/OAK-4844?focusedCommentId=15522577&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15522577]):
{noformat}
Total size:
21 GB in  87794 data segments
768 KB in      3 bulk segments
4 GB in maps (46450859 leaf and branch records)
1 GB in lists (55469092 list and bucket records)
3 GB in values (value and block records of 70765674 properties, 3429/378684/0/1214419 small/medium/long/external
blobs, 46258452/1862224/159 small/medium/long strings)
194 MB in templates (16772712 template records)
3 GB in nodes (251591739 node records)
{noformat}


> Root record references provide too little context for parsing a segment
> -----------------------------------------------------------------------
>
>                 Key: OAK-2498
>                 URL: https://issues.apache.org/jira/browse/OAK-2498
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: segment-tar
>            Reporter: Michael Dürig
>            Assignee: Francesco Mari
>              Labels: tools
>             Fix For: Segment Tar 0.0.14
>
>
> According to the [documentation | http://jackrabbit.apache.org/oak/docs/nodestore/segmentmk.html]
the root record references in a segment header provide enough context for parsing all records
within this segment without any external information. 
> Turns out this is not true: if a root record reference turns e.g. to a list record. The
items in that list are record ids of unknown type. So even though those records might live
in the same segment, we can't parse them as we don't know their type. 



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