Keith Turner created ACCUMULO-4778:
--------------------------------------
Summary: Resolving table name to table id is expensive
Key: ACCUMULO-4778
URL: https://issues.apache.org/jira/browse/ACCUMULO-4778
Project: Accumulo
Issue Type: Bug
Affects Versions: 1.8.1, 1.7.3
Reporter: Keith Turner
I was running a Fluo test application and profiling the tablet server and Fluo
worker. The Fluo worker does lots small scans against Accumulo. Resolving
table names to ids (which is done for each scan) was expensive enough to make a
significant showing in the profiling data.
I looked that the 1.8 code and it does the following to resolve a table name :
* reads over all cached table ids in zookeeper putting them in a treemap
* does a lookup in the treemap
Ideally the client code would keep a cache of name to id mappings and
invalidate them when something changes in zookeeper. The data in zookeeper is
stored by id, so it does need to be inverted to lookup by name.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
