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https://issues.apache.org/jira/browse/HBASE-15759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15273614#comment-15273614
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Hudson commented on HBASE-15759:
--------------------------------
FAILURE: Integrated in HBase-Trunk_matrix #897 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/897/])
HBASE-15759 RegionObserver.preStoreScannerOpen() doesn't have acces to (tedyu:
rev 532b914f08af31d34a9b4ede7e8f5a567a9b211e)
*
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionCoprocessorHost.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestCoprocessorScanPolicy.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseRegionObserver.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionObserver.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestRegionObserverScannerOpenHook.java
> 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
> Assignee: Ted Yu
> Priority: Minor
> Labels: coprocessors
> Fix For: 2.0.0
>
> Attachments: 15759.v1.patch, 15759.v2.patch, 15759.v3.patch,
> 15759.v4.patch
>
>
> 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 led 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
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