On 13 Oct 2015, at 23:25, Akash akbwiz+dovecot@gmail.com wrote:

Hi,

Mailing list archives suggest that this problem has been fixed in the older versions itself but I am getting the error still while trying to doveadm index a large folder of emails. Sometimes it throws error after 30000, something 40000, the latest it gave up after 111000. But it just never completes.

111000/322080doveadm: /home/stephan/packages/wheezy/i386/clucene-core-2.3.3.4/src/core/CLucene/index/DocumentsWriter.cpp:210: std::string lucene::index::DocumentsWriter::closeDocStore(): Assertion `numDocsInStore*8 == directory->fileLength( (docStoreSegment + "." + IndexFileNames::FIELDS_INDEX_EXTENSION).c_str() )' failed. Aborted

I am using dovecot 2:2.2.19-1~auto+7& libclucene-core1:i386 2.3.3.4-4 from debian wheezy backports. Please advice.

Looks like a bug in clucene library. I don't know if there's anything that can be done about it on Dovecot side. I recommend switching to fts-solr.