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From "chenxu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18715) isolate large query
Date Tue, 29 Aug 2017 15:58:00 GMT
chenxu created HBASE-18715:
------------------------------

             Summary: isolate large query
                 Key: HBASE-18715
                 URL: https://issues.apache.org/jira/browse/HBASE-18715
             Project: HBase
          Issue Type: New Feature
            Reporter: chenxu


large queries are very expensive than the general operation, and often delay insensitive.
if not isolate, Handlers may be all used by the large query,
lead to _Put_ or _Get_ slowly, so there need be an mechanism to isolate the large query.
for example we can use a separate _RpcExecutor_ to handle this.

for the following type of queries we can think it is a large query:
(1) _Scan_ has no startkey or endkey
(2) Client call _ResultScanner.next()_ more than a certain threshold
(3) Client call custom coprocessor which involves large queries(such as _AggregateService_)

for large queries, RegionServer should meet the following requirements
(1) dynamic configure if isolate large query is turn on
(2) setup certain Handlers to deal with large queries only
(3) in offpeak hours, large queries are not isolate
(4) dynamic configure if cache Blocks is turn on if the query is a large query



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