Which of these directories under home are/can rebuild on JIRA restart/re-indexing?

Question

# ls -l home/ | grep ^d

drwx------. 5 jira jira 4096 Feb 13  2015 caches

drwx------. 4 jira jira 4096 Jul  1  2013 data

drwxr-xr-x. 3 jira jira 4096 Jul 27 16:03 export

drwx------. 4 jira jira 4096 Jun 10  2013 import

drwx------. 2 jira jira 4096 Oct  7 17:41 log

drwx------. 2 jira jira 4096 Jun 10  2013 logos

drwxr-xr-x. 3 jira jira 4096 Dec 19  2013 logs

drwx------. 2 jira jira 4096 Jun 10  2013 monitor

drwx------. 5 jira jira 4096 Jun 10  2013 plugins

drwx------. 3 jira jira 4096 Jun 10  2013 tmp

I found the document for Confluence with all the information https://confluence.atlassian.com/doc/confluence-home-and-other-important-directories-590259707.html, but did not find for JIRA.

Malyaj Shanker · Answer

Yup, I was going to test re-index/start time of JIRA. That's why I was gathering the list of directories which are safe to play with.

Nic Brough -Adaptavist- · Answer

No.  Of that list, only "thumbnails" is totally safe.

There's a lot of data in the other three directories which is ok to lose or delete, but it has consequences.  Deletion of plugins-osgi-cache and temp means longer startup times and potentially some odd behaviour in places (nothing fatal, but you might get complaints).

But the big one is losing the index.  If you put that on ephemeral storage, you are going to have to do a full re-index of JIRA on *every* restart.  Before you do this, test it.  Will your users accept a full re-index on restart?  Remember on large JIRA systems, you are looking at *hours*, not seconds.

Malyaj Shanker · Answer

I will be migrating our JIRA to AWS. Since AWS instance provides fast temporary storage (ephemeral disk), I am planning to mount all the directories which can be rebuilt on restart/re-index of JIRA on that.

Like for confluence, the data in the following directories are regenerated on every Confluence restart/re-index.

home/index
home/plugins-osgi-cache
home/thumbnails
home/temp

So the above directories are safe to mount on a destructible storage.