robertwb opened a new pull request, #34718:
URL: https://github.com/apache/beam/pull/34718
State backed iterables are used specifically for the case where the full
iterable in question has already been deemed onerously large to fit into
memory, which is the antithesis of the kind of thing we want to cache. In
particular, for iterables too large to entirely fit into the cache, this will
evict everything else in the cache as a side effect of iterating over them.
Also, unlike standard state (including side input) values, these iterables
are much less likely to be iterated over more than once, reducing the value of
caching them.
Using a cache here is particularly problematic when writing avro (or
parquet) files with fixed sharding as these sinks already do significant
buffering of their own, and some of their common inputs (like
org.apache.avro.util.Utf8 objects) can double or triple in heald memory when
certain methods are accessed (which is not reflected in the cache sizing
algorithsm that assume objects cannot change notably in retained memory once
placed in the cache).
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