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https://issues.apache.org/jira/browse/HBASE-29722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Viraj Jasani resolved HBASE-29722.
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Hadoop Flags: Reviewed
Resolution: Fixed
> (backport portion of HBASE-27558) Coproc - possible data integrity issues for
> scan with heavy filters
> -----------------------------------------------------------------------------------------------------
>
> Key: HBASE-29722
> URL: https://issues.apache.org/jira/browse/HBASE-29722
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.5.13
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.5.14
>
>
> Phoenix provides two types of indexes: covered indexes and uncovered indexes.
> While running some tests on uncovered indexes, we discovered data integrity
> issue when run against HBase 2.5 but is not present when run against HBase
> 2.6. The issue is likely not related to uncovered indexes only.
> While scanning rows in uncovered index table, the corresponding full row is
> scanned from the data table. If the condition expression is provided by the
> user, the condition is evaluated on the data table row. Condition is
> evaluated as server side filters on the table regions. The test that
> discovered the issue has very large num of rows from the beginning that do
> not satisfy the filter expression. In other words, more than
> "hbase.client.scanner.max.result.size" MB worth of rows do not satisfy the
> filter expression. Therefore, the scanner returns no rows for HBase 2.5.
> However, increasing "hbase.client.scanner.max.result.size" to higher value
> made the scanner return correct result.
> This data correctness issue is not present on HBase 2.6 because HBASE-27558
> fixed it in a way already, while fixing this was not the intention of the
> Jira. The large num of changes b/ HBase 2.5 and 2.6 in the scan path (while
> mostly related to quotas and metrics) makes it difficult to find the root
> cause.
> The purpose of this Jira is to fix the issue for HBase 2.5.
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