ramkrishna.s.vasudevan created HBASE-18055:
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Summary: HBASE-17917 closes the scanners while a scan is in
progess for switching over to stream reads
Key: HBASE-18055
URL: https://issues.apache.org/jira/browse/HBASE-18055
Project: HBase
Issue Type: Bug
Components: regionserver, Scanners
Affects Versions: 2.0.0
Reporter: ramkrishna.s.vasudevan
Assignee: ramkrishna.s.vasudevan
Fix For: 2.0.0
In HBASE-17917 tries to switch from pread to stream read when a specific size
of bytes are read. So in order to switch over, it closes the existing scanners
and creates a new scanners with pread=false.
When we close the exisitng scanners - if the blocks are served from offheap
cache we will decrement the ref count on those blocks and if it becomes zero we
make the block ready for eviction. Then there is a chance that the result could
be corrupted if new blocks occupy the cache. So the expectation was that till
the RPC call completes the response we will hold on to the blocks that are
referred by the scan. (except the last one). So trying to switch over to stream
read will break this expectation and hence TestBlockEvictionfromclient fails.
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