Is your data all in the blockcache, otherwise you might have run into HBASE-7336 (https://issues.apache.org/jira/browse/HBASE-7336).Fixed 0.94.4. I assume you have enough handlers, etc. (i.e. does the same happen if issue multiple scan request across different region of the same region server?)
-- Lars ________________________________ From: James Taylor <jtay...@salesforce.com> To: HBase User <user@hbase.apache.org> Sent: Friday, February 8, 2013 5:49 PM Subject: independent scans to same region processed serially Wanted to check with folks and see if they've seen an issue around this before digging in deeper. I'm on 0.94.2. If I execute in parallel multiple scans to different parts of the same region, they appear to be processed serially. It's actually faster from the client side to execute a single serial scan than it is to execute multiple parallel scans to different segments of the region. I do have region observer coprocessors for the table I'm scanning, but my code is not doing any synchronization. Is there a known limitation in this area? Anyone else see anything similar? James
