Sharing Lucene Index

[Phil Boyd]

I've been trying to share the /gerrit/index directory by putting it on a shared file system and having 2 Gerrit instances symbolically linked to it. This has not been successful.

I understand that indexing with elasticsearch is meant to be the solution for sharing indexes in multi-master.

What is the reason that the Lucene Index can't be shared? 

[Matthias Sohn]

you can only use a single IndexWriter on the same index

citing

https://lucene.apache.org/core/5_5_3/core/org/apache/lucene/index/IndexWriter.html

"Opening an IndexWriter creates a lock file for the directory in use. Trying to open another IndexWriter on the
same directory will lead to a LockObtainFailedException."

 

[Luca Milanesio]

Hi Phil,

it would be used for you to go through Martin's presentation at the last Gerrit User Summit 2017 in London:

https://gitenterprise.me/2017/12/18/gerrit-user-summit-multimaster-at-qualcomm/

He explains very well what can and cannot be shared.

If you are curios on the reasons why Lucene Index can't be shared:

https://www.quora.com/How-can-two-applications-share-the-index-built-by-Lucene

HTH

Luca.

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