Marek Srank created HBASE-15759:
-----------------------------------
Summary: RegionObserver.preStoreScannerOpen() doesn't have acces
to current readpoint
Key: HBASE-15759
URL: https://issues.apache.org/jira/browse/HBASE-15759
Project: HBase
Issue Type: Improvement
Components: Coprocessors
Reporter: Marek Srank
Priority: Minor
RegionObserver.preStoreScannerOpen() doesn't have acces to current readpoint.
This is crucial e.g. when creating a new StoreScanner.
Although it is possible to obtain the readpoint via following workaround:
((HStore)store).getHRegion().getReadpoint(IsolationLevel.READ_COMMITTED)
...it presumes some knowledge of HBase internals and is not a clear option for
user.
The problem was introduced in HBASE-9754, where readpoint was introduced as an
argument to StoreScanner constructor, but wasn't passed to the
preStoreScannerOpen() hook in HStore.getScanner().
In our case it lead to bug, when we were incorrectly using smallestReadpoint()
instead, which made coprocessor missing data in some cases [1].
__________
[1]
http://mail-archives.apache.org/mod_mbox/hbase-dev/201604.mbox/%3CCAOUjMkwptCGacQ0d-4yOinDVBT%2Bbi2NOZee0fSbq%2Bk1R6V4-aw%40mail.gmail.com%3E
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
