Stream Processing and Analytics Vasiliki (Vasia) Kalavri
 vkalavri@bu.edu Spring 2020 3/24: Exactly-once fault-tolerance in Apache Flink ??? Vasiliki Kalavri | Boston University 2020 Some slides records from a previous offset of the stream. 43 What if the input stream comes from a socket? Exactly-once state consistency (in Apache Flink) can be achieved only if all streaming sources are re-settable state deltas to reduce data transfer ??? Vasiliki Kalavri | Boston University 2020 End-to-end exactly once • Flink’s checkpointing and recovery mechanism only resets the internal state of a streaming

query-parts to generate or an estimate of the number of rows each query-part should return. Thus, exactly one of split_count or num_rows_per_query_part should be nonzero. The non-given parameter is calculated argument is required for the command This error occurs if the command is not called with exactly one argument. DeleteCellInfo Deletes the CellInfo for the provided cell. The cell cannot be referenced is required for the command This error occurs if the command is not called with exactly one argument. 108 GetCellInfo Prints a JSON representation of the CellInfo for a cell. Example

query-parts to generate or an estimate of the number of rows each query-part should return. Thus, exactly one of split_count or num_rows_per_query_part should be nonzero. The non-given parameter is calculated argument is required for the command This error occurs if the command is not called with exactly one argument. DeleteCellInfo Deletes the CellInfo for the provided cell. The cell cannot be referenced is required for the command This error occurs if the command is not called with exactly one argument. GetCellInfo Prints a JSON representation of the CellInfo for a cell. Example 116

is required for the command This error occurs if the command is not called with exactly one argument. UpdateCellsAlias Updates the content of a CellAlias with the provided parameters. required for the command This error occurs if the command is not called with exactly one argument. DeleteCellsAlias Deletes the CellsAlias for the provided alias. After deleting an required for the command This error occurs if the command is not called with exactly one argument. GetCellsAliases Fetches in json format all the existent cells alias groups. Example

is required for the command This error occurs if the command is not called with exactly one argument. UpdateCellsAlias Updates the content of a CellAlias with the provided parameters. required for the command This error occurs if the command is not called with exactly one argument. DeleteCellsAlias Deletes the CellsAlias for the provided alias. After deleting an required for the command This error occurs if the command is not called with exactly one argument. GetCellsAliases Fetches in json format all the existent cells alias groups. Example

report the GTID just before the “COMMIT”. This is the point where it’s actually useful. Knowing exactly when a GTID will be received will simplify the design of the vplayer. • Introduce Pseudo-GTID: In result is sent to all callers that have been waiting. Notes: • An identical query is one that is exactly the same, including literals and bind variables. • Query consolidation doesn’t work in streaming is required for the command This error occurs if the command is not called with exactly one argument. UpdateCellsAlias Updates the content of a CellAlias with the provided parameters.

report the GTID just before the “COMMIT”. This is the point where it’s actually useful. Knowing exactly when a GTID will be received will simplify the design of the vplayer. • Introduce Pseudo-GTID: In is required for the command This error occurs if the command is not called with exactly one argument. UpdateCellsAlias Updates the content of a CellAlias with the provided parameters. required for the command This error occurs if the command is not called with exactly one argument. DeleteCellsAlias Deletes the CellsAlias for the provided alias. After deleting an

report the GTID just before the “COMMIT”. This is the point where it’s actually useful. Knowing exactly when a GTID will be received will simplify the design of the vplayer. • Introduce Pseudo-GTID: In is required for the command This error occurs if the command is not called with exactly one argument. 168 UpdateCellsAlias Updates the content of a CellAlias with the provided parameters required for the command This error occurs if the command is not called with exactly one argument. DeleteCellsAlias Deletes the CellsAlias for the provided alias. After deleting an

report the GTID just before the “COMMIT”. This is the point where it’s actually useful. Knowing exactly when a GTID will be received will simplify the design of the vplayer. • Introduce Pseudo-GTID: In is required for the command This error occurs if the command is not called with exactly one argument. UpdateCellsAlias Updates the content of a CellAlias with the provided parameters. required for the command This error occurs if the command is not called with exactly one argument. DeleteCellsAlias Deletes the CellsAlias for the provided alias. After deleting an

Containers 60Library - Ranges views::concat (in dra�) Take/Drop views::slice views::take_exactly views::drop_exactly Adaptor compositions views::upto …much more… A Plan for C++26 Ranges 61in dra� implementation views::(take|drop)_exactly Example implementation auto r0 = views::iota(0) | views::take_exactly(5); print("{}\n", r0); [0, 1, 2, 3, 4] auto r1 = views::iota(0) | views::drop_exactly(5); print("{}\n" | std::views::take_exactly(5)); [5, 6, 7, 8, 9] 1 2 3 4 5 64still in work P3230 views::(take|drop)_exactly Example implementation auto r0 = views::iota(0) | views::take_exactly(5); print("{}\n", r0);