Mark Miller created SOLR-3621:
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Summary: Fix concurrency race around newIndexWriter
Key: SOLR-3621
URL: https://issues.apache.org/jira/browse/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 road.
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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