[
https://issues.apache.org/jira/browse/LUCENE-4870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13610102#comment-13610102
]
Michael McCandless commented on LUCENE-4870:
--------------------------------------------
Not good!
Is there no reliable way to differentiate "file does not exist" from "I ran out
of file handles" from the exception we get from trying to open
RAF/FileChannel.open?
Is File.exists() even trustworthy once you've run out of descriptors?
Maybe ... we should fix SegmentInfos.read, where it calls dir.openInput, to
throw a different exception (OpenSegmentsFailedIOException) if the open failed
vs if a subsequent op (reading bytes from segments file, or opening the
SegmentReaders) failed. This way we could catch this exception above and know
that a segments file in fact exists yet we were unable to open it (and return
"true" for indexExists in this case).
> Lucene deletes entire index if and exception is thrown due do
> TooManyOpenFiles and OpenMode.CREATE_OR_APPEND
> ------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-4870
> URL: https://issues.apache.org/jira/browse/LUCENE-4870
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.0, 4.1, 4.2
> Reporter: Simon Willnauer
> Priority: Blocker
> Fix For: 5.0, 4.3, 4.2.1
>
> Attachments: LUCENE-4870.patch
>
>
> The Lucene IndexWriter might delete an entire index if it hits a
> FileNotFoundException triggered by TooManyOpenFiles during IndexWriter
> creation. We try to figure out if the index exists already if the
> OpenMode.CREATE_OR_APPEND is set (which is default). Yet, the logic in
> DirectoryReader#indexExists(Directory) will just return false if we are not
> able to open the segment file. This will cause the IW to assume there is no
> index and it will try to create a new index there trashing all existing
> commit points treating this as a OpenMode.CREATE.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
