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https://issues.apache.org/jira/browse/LUCENE-5987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14236268#comment-14236268
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ASF subversion and git services commented on LUCENE-5987:
---------------------------------------------------------
Commit 1643466 from [~mikemccand] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1643466 ]
LUCENE-5987: IndexWriter forcefully closes itself on hitting aborting exception
> Make indexwriter a mere mortal when exceptions strike
> -----------------------------------------------------
>
> Key: LUCENE-5987
> URL: https://issues.apache.org/jira/browse/LUCENE-5987
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Assignee: Michael McCandless
> Attachments: LUCENE-5987.patch, LUCENE-5987.patch, LUCENE-5987.patch
>
>
> IndexWriter's exception handling is overly complicated. Every method in
> general reads like this:
> {code}
> try {
> try {
> try {
> ...
> // lock order: COMPLICATED
> synchronized(this or that) {
> }
> ...
> } finally {
> if (!success5) {
> deleter.deleteThisFileOrThat();
> }
> ...
> }
> }
> {code}
> Part of the problem is it acts like its an invincible superhero, e.g. can
> take a disk full on merge or flush to the face and just keep on trucking, and
> you can somehow fix the root cause and then just go about making commits on
> the same instance.
> But we have a hard enough time ensuring exceptions dont do the wrong thing
> (e.g. cause corruption), and I don't think we really test this crazy behavior
> anywhere: e.g. making commits AFTER hitting disk full and so on.
> It would probably be simpler if when such things happen, IW just considered
> them "tragic" just like OOM and rolled itself back, instead of doing all
> kinds of really scary stuff to try to "keep itself healthy" (like the little
> dance it plays with IFD in mergeMiddle manually deleting CFS files).
> Besides, without something like a WAL, Indexwriter isn't really fit to be a
> superhero anyway: it can't prevent you from losing data in such situations.
> It just doesn't have the right tools for the job.
> edit: just to be clear I am referring to abort (low level exception during
> flush) and exceptions during merge. For simple non-aborting cases like
> analyzer errors, of course we can deal with this. We already made great
> progress on turning a lot of BS exceptions that would cause aborts into
> non-aborting ones recently.
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