Sanjeet Malhotra created HBASE-29626:
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Summary: Refactor how server side scan metrics are populated for
correct and cleaner consumption in Coproc hooks
Key: HBASE-29626
URL: https://issues.apache.org/jira/browse/HBASE-29626
Project: HBase
Issue Type: Improvement
Reporter: Sanjeet Malhotra
Assignee: Sanjeet Malhotra
HBASE-29398 introduced ThreadLocalServerSideScanMetrics to capture multiple
scan metrics to capture very low level metrics. The change ended up making
region scanner stateful and in coproc hooks it can happen that original scanner
is closed rather a new region scanner is opened thus, we will lose the
state/scan metrics stored in RegionScanner. The proposal is to refactor to make
RegionScanner non stateful again and make ThreadLocalServerSideScanMetrics
LimitedPrivate to consume in coproc hooks.
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