Anoop Sam John created HBASE-13926:
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Summary: Close the scanner only after Call#setResponse
Key: HBASE-13926
URL: https://issues.apache.org/jira/browse/HBASE-13926
Project: HBase
Issue Type: Sub-task
Reporter: Anoop Sam John
Assignee: Anoop Sam John
Fix For: 2.0.0
This is for HBASE-12295. We will be delivering cells directly from shared cache
memory. HBASE-12295 adds a ref count based prevention mechanism to avoid block
eviction, when that memory area in use by scanners. We will decrement ref count
at scanner close. The memory area will be in use till a cellblock is created or
PB scan reply message is built. So we can delay the close of the scanner until
the response is set for the scanner Call. This is done via a RpcCallback way.
The callback is set on Call at scan time. Once the setResponse is done, the
Call will execute the RpcCallback.
This jira also adds a facility to do some cleanup/close during the course of
scan. Scan from client makes many RPCs fetching N rows each time. Only at the
end the scanner close will happen. We will add a new batchClose() facility with
which we can do any cleanup after every rpc call is executed and rows fetched
for return.
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