On 3/25/2014 6:12 PM, Software Dev wrote:
What are the main contributing factors for Solr Cloud generating a lot
of disk IO?
A lot of reads? Writes? Insufficient RAM?
I would think if there was enough disk cache available for the whole
index there would be little to no disk IO.
Toke's answer is spot on.
Something additional: In a previous thread, you mentioned optimizing.
That will generate a lot of disk I/O, most of which is unavoidable.
Actual disk write I/O is completely unavoidable with an optimize, no
matter how big your disk cache is. Unless you have TWICE your index
size in RAM available for the disk cache, a large percentage of the read
I/O from an optimize will also hit the disk, because the optimized index
will push the old index out of the disk cache. This slows down searches.
Thanks,
Shawn
