Aaron McCurry created BLUR-230:
----------------------------------
Summary: Change the index merging code to not effect the Block
Cache
Key: BLUR-230
URL: https://issues.apache.org/jira/browse/BLUR-230
Project: Apache Blur
Issue Type: New Feature
Components: Blur
Affects Versions: 0.3.0
Reporter: Aaron McCurry
Fix For: 0.3.0
The current implementation of the index merge scheduler will cause the Block
Cache directory to read in all the information into the cache while it's
merging into a new segment. This may evict more useful block information and
thus cause performance issues.
This task will likely have to modify the Block Cache so that if the needed data
is present in the cache it is used. However if it's missing, it is read from
HDFS and does NOT update Block Cache. Also needed, if the data was present in
the cache have the fact the scheduler read the data not count as a hit. LRU
caches are basically a queue with a map and every time you read something from
the map it removes the item from the queue and adds it back to the front of the
queue. That way it's less likely to be evicted. During merges this behavior
should be bypassed.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
