[jira] [Created] (FLINK-29297) Group Table Store file writers into SingleFileWriter and RollingFileWriter

["Caizhi Weng (Jira)" <ji...@apache.org>]

Caizhi Weng created FLINK-29297:
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             Summary: Group Table Store file writers into SingleFileWriter and RollingFileWriter
                 Key: FLINK-29297
                 URL: https://issues.apache.org/jira/browse/FLINK-29297
             Project: Flink
          Issue Type: Sub-task
          Components: Table Store
            Reporter: Caizhi Weng
             Fix For: table-store-0.3.0


Currently we have two types of files to write:
* Data files (LSM tree files), where a level 0 data file is a single file and a level >= 1 data file is a set of rolling files. Statistics for these files are needed for pruning when scanning.
* Extra files (changelog files), just a list of records. No statistics are needed.

However, current writers are all based on {{MetricFileWriter}}, which always produces statistics.

We'd like to refactor the writers and group them into {{SingleFileWriter}} and {{RollingFileWriter}}. {{StatsCollectingSingleFileWriter}} should be a subclass of {{SingleFileWriter}} which additionally produces statistics, and data file writers should be a subclass of {{StatsCollectingSingleFileWriter}} or {{RollingFileWriter}} based on their level. For extra file writers, extending from {{SingleFileWriter}} is enough.



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