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https://issues.apache.org/jira/browse/SOLR-2801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119449#comment-13119449
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Ruben Inoto commented on SOLR-2801:
-----------------------------------
Hi Hoss, you are right.
The point here was that there is no way to recover from that situation without
1) deleting the index directory and 2) restarting the server (or at least the
reloading config).
> IndexNotFoundException thrown when the index directory has no segments file
> ---------------------------------------------------------------------------
>
> Key: SOLR-2801
> URL: https://issues.apache.org/jira/browse/SOLR-2801
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 3.4
> Reporter: Ruben Inoto
> Priority: Trivial
>
> If the directory where the index is stored gets somehow corrupted, and it
> becomes empty or the segments files are deleted, any attempt to access the
> Solr server (via /select, /update, etc..) will throw the following exception:
> {code}
> org.apache.lucene.index.IndexNotFoundException: no segments* file found in
> org.apache.lucene.store.NIOFSDirectory@/index_dir
> {code}
> The only workaround we have found is to stop the server, remove the /index
> directory, and start again.
> We have found more useful to create a new implementation of the
> IndexReaderFactory (that extends StandardIndexReaderFactory), that, in case
> of a IndexNotFoundException, it tries to "fix" the index directory by opening
> an IndexWriter on it and doing a commit:
> {code}
> @Override
> public IndexReader newReader(Directory indexDir, boolean readOnly) throws
> IOException {
> try {
> return super.newReader(indexDir, readOnly);
> } catch (IndexNotFoundException e) {
> logger.warn(
> "Warning: Trying to get a new reader threw an exception.
> Trying to create a writer first, and then get the reader",
> e);
> IndexWriterConfig config = new
> IndexWriterConfig(Version.LUCENE_34, new WhitespaceAnalyzer(
> Version.LUCENE_34));
> config.setOpenMode(OpenMode.CREATE_OR_APPEND);
> IndexWriter writer = new IndexWriter(indexDir, config);
> writer.commit();
> writer.close();
> try {
> return super.newReader(indexDir, readOnly);
> } catch (IndexNotFoundException e2) {
> logger.error(
> "Trying to commit in the writer didn't work, as the
> reader is still throwing an exception :(. Re-throwing exception",
> e2);
> throw e2;
> }
> }
> }
> {code}
> Would it make sense to add something like this to the
> StandardIndexReaderFactory?
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