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From "Mark Miller (JIRA)" <>
Subject [jira] [Created] (SOLR-3621) Fix concurrency race around newIndexWriter
Date Sat, 14 Jul 2012 22:31:34 GMT
Mark Miller created SOLR-3621:

             Summary: Fix concurrency race around newIndexWriter 
                 Key: SOLR-3621
             Project: Solr
          Issue Type: Bug
          Components: update
            Reporter: Mark Miller
            Assignee: Mark Miller
            Priority: Minor
             Fix For: 4.0, 5.0

When I did the first big refactor on update handler, I was trying to never close the index
writer - I had to give in on this goal due to the replication handler - it requires rebooting
the indexwriter. At the time, I settled for allowing a little race that didn't show up as
an issue in tests - this IW reboot was always a bit of a hack in the past anyhow.

Now that the dust has settled, we should make this air tight though. I'd like to make opening
a new indexwriter a full class citizen rather than a hacky method only used minimally for
replication to reboot things. It should be a solid API that is valid for any uses down the

For some IW config changes, we may want to do it in 'some' cases on reload.

To do this, we have to start ref counting iw use - so that we only actually open a new one
and close the old one when it's not in use at all.

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