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Posted to dev@lucene.apache.org by "Michael Garski (JIRA)" <ji...@apache.org> on 2013/06/10 02:42:20 UTC
[jira] [Commented] (SOLR-4764) When using NRT, just init the reader
from IndexWriter
[ https://issues.apache.org/jira/browse/SOLR-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13679245#comment-13679245 ]
Michael Garski commented on SOLR-4764:
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I discovered the same thing, and that there is no re-use of segment caches on a read-only replication slave as well. I opened SOLR-4909 to handle the slave replication case. I'm not sure that changing the IndexReaderFactory's method will work with a read-only slave, but adding another method for NRT/replication masters that take a writer might work.
> When using NRT, just init the reader from IndexWriter
> -----------------------------------------------------
>
> Key: SOLR-4764
> URL: https://issues.apache.org/jira/browse/SOLR-4764
> Project: Solr
> Issue Type: Improvement
> Reporter: Robert Muir
>
> Spinoff from SOLR-4761
> Solr first opens a DirectoryReader from the directory, then later will pass this to IW openIfChanged.
> I noticed this when i was confused that mergedsegmentwarmer doesn't appear to work at first until after you've reopened...
> I'm not totally sure what the current behavior causes (does IW's pool reuse segments from this passed-in "external" reader, or is this causing some horrible doubling-up/inefficient stuff etc?). To some extent i think we should change it even if its actually performant: I think its confusing.
> I think ideally we'd change IndexReaderFactory's method to take writer instead of directory so that custom DirectoryReaders can still work.
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