Vihang Karajgaonkar created IMPALA-9841:
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Summary: Table level writeIdList represent the filemetadata
snapshot
Key: IMPALA-9841
URL: https://issues.apache.org/jira/browse/IMPALA-9841
Project: IMPALA
Issue Type: Improvement
Reporter: Vihang Karajgaonkar
Assignee: Vihang Karajgaonkar
Currently, in HdfsTable
https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/catalog/HdfsTable.java#L1017
we reload the ValidWriteIdList every time. However in case of incremental
refresh, it is possible that the file-metadata is not loaded at all or only
loaded for certain partitions. This would mean that the cached ValidWriteIdList
of the table is out-of-sync with the actual file-metadata which is cached in
catalog.
This is currently not a problem since we on rely on the ValidWriteIdList during
the loading of the file-metadata. However, for a consistent reads of the
transactional tables, we would need to make sure that this ValidWriteIdList is
guaranteed to represent the cached files.
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