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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