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https://issues.apache.org/jira/browse/SOLR-5150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13743347#comment-13743347
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Michael McCandless commented on SOLR-5150:
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That's correct: if IndexWriter already has a SegmentReader open on that segment
because it's pooling readers, in turn because an NRT reader was pulled, then if
that segment is merged it will re-use that already opened SegmentReader rather
than open a new one.
> HdfsIndexInput may not fully read requested bytes.
> --------------------------------------------------
>
> Key: SOLR-5150
> URL: https://issues.apache.org/jira/browse/SOLR-5150
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.4
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 4.5, 5.0
>
> Attachments: SOLR-5150.patch
>
>
> Patrick Hunt noticed that our HdfsDirectory code was a bit behind Blur here -
> the read call we are using may not read all of the requested bytes - it
> returns the number of bytes actually written - which we ignore.
> Blur moved to using a seek and then readFully call - synchronizing across the
> two calls to deal with clones.
> We have seen that really kills performance, and using the readFully call that
> lets you pass the position rather than first doing a seek, performs much
> better and does not require the synchronization.
> I also noticed that the seekInternal impl should not seek but be a no op
> since we are seeking on the read.
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