[jira] [Updated] (KAFKA-20492) Factor out RocksDBStore iteration methods to DBAccessor

["Bill Bejeck (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-20492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bill Bejeck updated KAFKA-20492:
--------------------------------
    Affects Version/s: 4.4.0

> Factor out RocksDBStore iteration methods to DBAccessor
> -------------------------------------------------------
>
>                 Key: KAFKA-20492
>                 URL: https://issues.apache.org/jira/browse/KAFKA-20492
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>    Affects Versions: 4.4.0
>            Reporter: Nicholas Telford
>            Assignee: Nicholas Telford
>            Priority: Major
>
> Currently, {{RocksDBStore}} iteration methods ({{{}all{}}}/{{{}range{}}}/{{{}prefixScan{}}}) construct a wrapping {{RocksDbIterator}} in the {{{}ColumnFamilyAccessor{}}}; the {{DBAccessor}} simply returns the underlying {{{}RocksIterator{}}}.
> This won't work for our (upcoming) {{{}TransactionalDBAccessor{}}}, which will need to construct an instance of {{StagedMergeIterator}} (see KAFKA-20490).
> To prepare for this, we will need to refactor {{DBAccessor}} to add implementation-dependent methods for {{{}all{}}}/{{{}range{}}}/{{{}prefixScan{}}}, to control the construction of the wrapping iterators.



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