Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/3858#discussion_r115544603
--- Diff: docs/dev/stream/checkpointing.md ---
@@ -124,8 +124,8 @@ env.getCheckpointConfig.setMaxConcurrentCheckpoints(1)
## Selecting a State Backend
-The checkpointing mechanism stores the progress in the data sources and
data sinks, the state of windows, as well as the [user-defined
state](state.html) consistently to
-provide *exactly once* processing semantics. Where the checkpoints are
stored (e.g., JobManager memory, file system, database) depends on the
configured
+The checkpointing mechanism stores consistent snapshots of the progress in
the data sources and data sinks, the state of windows and timers, as well as
any [user-defined state](state.html), thereby
--- End diff --
Perhaps this first sentence could use a little more work. Can we better
explain "progress"? "as well as" -> "and"? Could we move "providing *exactly
once* processing semantics" to the beginning: "The checkpointing mechanism
provides ..."?
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