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Adela Maznikar commented on HBASE-4047: --------------------------------------- I am curious if there is any additional progress here. Really exciting idea! > [Coprocessors] Generic external process host > -------------------------------------------- > > Key: HBASE-4047 > URL: https://issues.apache.org/jira/browse/HBASE-4047 > Project: HBase > Issue Type: New Feature > Components: Coprocessors > Reporter: Andrew Purtell > Assignee: Andrew Purtell > > Where HBase coprocessors deviate substantially from the design (as I > understand it) of Google's BigTable coprocessors is we've reimagined it as a > framework for internal extension. In contrast BigTable coprocessors run as > separate processes colocated with tablet servers. The essential trade off is > between performance, flexibility and possibility, and the ability to control > and enforce resource usage. > Since the initial design of HBase coprocessors some additional considerations > are in play: > - Developing computational frameworks sitting directly on top of HBase hosted > in coprocessor(s); > - Introduction of the map reduce next generation (mrng) resource management > model, and the probability that limits will be enforced via cgroups at the OS > level after this is generally available, e.g. when RHEL 6 deployments are > common; > - The possibility of deployment of HBase onto mrng-enabled Hadoop clusters > via the mrng resource manager and a HBase-specific application controller. > Therefore we should consider developing a coprocessor that is a generic host > for another coprocessor, but one that forks a child process, loads the target > coprocessor into the child, establishes a bidirectional pipe and uses an > eventing model and umbilical protocol to provide for the coprocessor loaded > into the child the same semantics as if it was loaded internally to the > parent, and (eventually) use available resource management capabilities on > the platform -- perhaps via the mrng resource controller or directly with > cgroups -- to limit the child as desired by system administrators or the > application designer. -- This message was sent by Atlassian JIRA (v6.1.5#6160)