【精选】《HBase的企业级应用》-演讲人：Ted Yu,HBase Committer《HBase的企业级应用》-演讲人：Ted Yu,HBase Committer.pdf

New HBase Features Ted Yu yuzhihong@ © Hortonworks Inc. 2011 Page 1 About myself • Graduated from Tsinghua University in 1992 • Hbase PMC member since June 2011 • Senior Member of Technical Staff @ Hortonworks • Hbase 0.92.2 Release Manager Architecting the Future of Big Data Page 2 © Hortonworks Inc. 2011 Snapshot Types • Offline snapshot: table disabled • Globally consistent snapshot ① consistent across all servers ② two-phase commit was planned ③ Barrier based Procedure implemented ④ Unavailability SLA maintained per region • Timestamp consistent snapshot: point-in-time according to each server Architecting the Future of Big Data Page 3 © Hortonworks Inc. 2011 DISTRIBUTED BARRIER PROCEDURE • HBASE-7212, simplified version of HBASE-6573 • Globally consistent snapshot requires the ability to quiesce a set of regionservers before allowing progress. • A failure in one regionserver results in cancelation on all others • Need to be able to force failure after a specified timeout elapses • Solution: Users need only implement methods ① to acquireBarrier, ② to act when insideBarrier, ③ and to releaseBarrier Architecting the Future of Big Data Page 4 © Hortonworks Inc. 2011 Barrier Procedure coordination Architecting the Future of Big Data Page 5 © Hortonworks Inc. 2011 Procedure vs 2 Phas