Adds some I/O timing metrics to solr so you can evaluate your disk performance.

Only works for NIOFSDirectory (non-Windows systems).

Build project. Add jar file to solr/lib.

Add elements to solrconfig:

<directoryFactory class="org.apache.solr.core.contrib.TimedDirectoryFactory"></directoryFactory>

<requestHandler name="/dirStats" class="org.apache.solr.core.contrib.DirectoryStatsHandler">
</requestHandler>

Run Solr. Open:

/dirStats

to see I/O timing information.

Open:

/dirStats?reset=true

to reset stats.

This wraps readInternal() call in NIOFSDirectory in lucene. I believe this will end up capturing all the bytes read from disk and the amount of time spent reading these bytes.