Too Many Open Files Error on Lucene

Too many open files Error on Lucene

I already used the ulimit but error still shows.
Then I inspected the customized core adapters for lucene functions.
Turns out there's too many IndexWriter.open directory that is LEFT OPEN.

Should note that after processing, will always call on closing the directory opened.

Too many open files Error on Lucene

I already used the ulimit but error still shows.
Then I inspected the customized core adapters for lucene functions.
Turns out there's too many IndexWriter.open directory that is LEFT OPEN.

Should note that after processing, will always call on closing the directory opened.

Too Many open file exception while indexin using solr

File Descriptor will be your most likely cause.

Check the limit which your operating system has set. and adjust accordingliy.
on Unix, the command to view and set is ulimit.

Elasticsearch too many open files

OK, so you have 5 nodes on the same host and you can have maximum 9000 open files. If you sum up the second column you're above that number, hence the error you're getting.

In order to see during startup how many max open files your ES is configured with, you can start your process with -Des.max-open-files=true and your log will show you how many max open files you can have.

Check here and here (depends on what Linux distro you have) on how to configure that settings for your Linux distro, but you might have to tweak /etc/security/limits.conf as well.

Lucene Java opening too many files. Am I using IndexWriter properly?

1) Is this the advised way to use
IndexWriter (instantiating a new one
on each add to index)?

i advise No, there are constructors, which will check if exists or create a new writer, in the directory containing the index. problem 2 would be solved if you reuse the indexwriter.

EDIT:

Ok it seems in Lucene 3.2 the most but one constructors are deprecated,so the resue of Indexwriter can be achieved by using Enum IndexWriterConfig.OpenMode with value CREATE_OR_APPEND.

also, opening new writer and closing on each document add is not efficient,i suggest reuse, if you want to speed up indexing, set the setRamBufferSize default value is 16MB, so do it by trial and error method

from the docs:

Note that you can open an index with
create=true even while readers are
using the index. The old readers will
continue to search the "point in time"
snapshot they had opened, and won't
see the newly created index until they
re-open.

also reuse the IndexSearcher,i cannot see the code for searching, but Indexsearcher is threadsafe and can be used as Readonly as well

also i suggest you to use MergeFactor on writer, this is not necessary but will help on limiting the creation of inverted index files, do it by trial and error method

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