[
https://issues.apache.org/jira/browse/OAK-6269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chetan Mehrotra reassigned OAK-6269:
------------------------------------
Assignee: Vikas Saurabh
> Support non chunk storage in OakDirectory
> -----------------------------------------
>
> Key: OAK-6269
> URL: https://issues.apache.org/jira/browse/OAK-6269
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: lucene
> Reporter: Chetan Mehrotra
> Assignee: Vikas Saurabh
> Fix For: 1.8
>
>
> Logging this issue based on offline discussion with [~catholicon].
> Currently OakDirectory stores files in chunk of 1 MB each. So a 1 GB file
> would be stored in 1000+ chunks of 1 MB.
> This design was done to support direct usage of OakDirectory with Lucene as
> Lucene makes use of random io. Chunked storage allows it to seek to random
> position quickly. If the files are stored as Blobs then its only possible to
> access via streaming which would be slow
> As most setup now use copy-on-read and copy-on-write support and rely on
> local copy of index we can have an implementation which stores the file as
> single blob.
> *Pros*
> * Quite a bit of reduction in number of small blobs stored in BlobStore.
> Which should reduce the GC time specially for S3
> * Reduced overhead of storing a single file in repository. Instead of array
> of 1k blobids we would be stored a single blobid
> * Potential improvement in IO cost as file can be read in one connection and
> uploaded in one.
> *Cons*
> It would not be possible to use OakDirectory directly (or would be very slow)
> and we would always need to do local copy.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
