Hello, Not sure if this answers your question, but please note the following:
Processing occurs via MapReduce, Spark, or Tez. The processing engines run on top of YARN. Each processing engine derives much of their HA from YARN. There are some quarks there, but these engines running on YARN is generally considered to be highly available. HiveServer2 does not share client session state between instances. Therefore, if a single HiveServer2 instance is lost, all of the work being performed which was originated from this instance will be lost. Clients will have to re-connect to another instance of HiveServer2 and re-submit their queries. There is no transparent client fail-over offered at this time. Thanks. On Fri, Nov 15, 2019 at 2:05 AM qq <987626...@qq.com> wrote: > Hello: > > What is the Hive HA processing mechanism? What problems can be > solved? > > thinks. > I am looking forward to your reply！ >
