IndexNotFoundException thrown when the index directory has no segments file
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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: Minor
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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