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stack commented on HBASE-5487: ------------------------------ @enis List makes for pretty good set of requirements. We used to talk 100k regions but folks are long past that now so we are behind the curve (Flurry are >250k IIRC) and we may want to tend away from a few large regions and more toward many small regions if we can get AM to perform (advantages: smaller compression runs, easier to free up WALs, etc) > Generic framework for Master-coordinated tasks > ---------------------------------------------- > > Key: HBASE-5487 > URL: https://issues.apache.org/jira/browse/HBASE-5487 > Project: HBase > Issue Type: New Feature > Components: master, regionserver, Zookeeper > Affects Versions: 0.94.0 > Reporter: Mubarak Seyed > Priority: Critical > Attachments: Region management in Master5.docx, Region management in > Master.pdf > > > Need a framework to execute master-coordinated tasks in a fault-tolerant > manner. > Master-coordinated tasks such as online-scheme change and delete-range > (deleting region(s) based on start/end key) can make use of this framework. > The advantages of framework are > 1. Eliminate repeated code in Master, ZooKeeper tracker and Region-server for > master-coordinated tasks > 2. Ability to abstract the common functions across Master -> ZK and RS -> ZK > 3. Easy to plugin new master-coordinated tasks without adding code to core > components -- This message was sent by Atlassian JIRA (v6.1#6144)