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https://issues.apache.org/jira/browse/OAK-727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888317#comment-13888317
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Jukka Zitting commented on OAK-727:
-----------------------------------
Note that based on the work in OAK-924 the namespace snapshots are no longer
needed for performance, so I dropped them along other changes in revision
1563143. That revision notably boosted XML import performance (with Jackrabbit
results included for scale):
{noformat}
# XmlImportTest C min 10% 50% 90% max N
Jackrabbit 1 7549 7549 8186 9158 9158 4
Oak-Tar (before) 1 6435 6435 6580 6720 6720 9
Oak-Tar (after) 1 5381 5383 5479 5722 5737 10
{noformat}
> Use snapshot of namespaces in SessionImpl
> -----------------------------------------
>
> Key: OAK-727
> URL: https://issues.apache.org/jira/browse/OAK-727
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: jcr
> Affects Versions: 0.6
> Reporter: Marcel Reutegger
> Priority: Minor
> Fix For: 0.7
>
> Attachments: OAK-727.patch, OAK-727.patch
>
>
> Importing content with the Oak XML ImportHandler makes quite heavy use of
> namespaces and results in frequent calls to Namespaces.getNamespaceMap().
> Most of the time the complete namespace map is not actually needed and only a
> single mapping is requested. This adds quite some overhead, which we can
> easily avoid. The JCR specification says (3.5.1):
> bq. The local namespace mapping of a session is determined by the initial set
> of mappings copied from the namespace registry and any session-local changes
> made to that set.
> Right now we don't have this initial set, but always ask the namespace
> registry.
> I suggest we copy the mappings on first usage and work with this copy.
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