Greetings!
We are working with a riaksearch cluster that uses innostore as the primary
backend in tandem with merge_index that is required by search. From reading
the Basho wiki it looks like the following are the most important factors
affecting memory and performance:
• innostore
• put data_home_dir and log_group_home_dir on different spindles
• noatime
• buffer_pool_size
• flush_method
• merge_index
• data_root
• buffer_rollover_size
• max_compact_segments
• segment_file_buffer_size
• segment_full_read_size
• segment_block_size
Ideally, data_home_dir, log_group_home_dir, and data_root would all be on
different spindles, but if you had just 2 disks available what would you
recommend? Would it be best to have data_home_dir and data_root on one and
then log_group_home_dir on the other?
in calculating the proper setting for buffer_pool_size you are directed to
allocate 60-80 percent of available RAM. So lets assume you want to take the
remaining 20-40% of available RAM and split it up between innostore and
merge_index?
Would it be best to give each of them half of that value?
Determining the approximate memory requirements for merge_index isn't (to me)
real obvious. I looks like the following all have an effect:
* buffer_rollover_size
* buffer_delayed_write_size
* max_compact_segments
* segment_query_read_ahead_size
* segment_compaction_read_ahead_size
* segment_full_read_size
* segment_block_size
* segment_values_staging_size
Is there a formula for determining the (approximate) proper values to use given
a certain amount of available RAM?
Thanks in advance for any advice. Sorry for all the questions!
--gordon
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