[HBASE-5492] Caching StartKeys and EndKeys of Regions

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.92.0
• Component/s: Client

Environment

all

• Assignee: Unassigned
• Reporter: Honghua Zhu
• Created: 29/Feb/12 16:19
• Updated: 13/Jun/22 15:33
• Resolved: 08/Mar/13 02:11

Description

Each call for HTable.getStartEndKeys will read meta table.

In particular,
in the case of client side multi-threaded concurrency statistics,
we must call HTable.coprocessorExec== > getStartKeysInRange ==> getStartEndKeys,
resulting in the need to always scan the meta table.

This is not necessary,
we can implement the HConnectionManager.HConnectionImplementation.locateRegions(byte[] tableName) method,

then, get the StartKeys and EndKeys from the cachedRegionLocations of HConnectionImplementation.

Combined with https://issues.apache.org/jira/browse/HBASE-5491, can improve the performance of statistical

Issue Links

• duplicates: HBASE-6870 HTable#coprocessorExec always scan the whole table
• relates to: HBASE-5489 Add HTable accessor to get regions for a key range