[
https://issues.apache.org/jira/browse/FLINK-935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030715#comment-14030715
]
Stephan Ewen commented on FLINK-935:
------------------------------------
The problem is that the end of the iteration does not produce partitioned data,
which the beginning of the next iteration assumes.
> Bug in Optimizer when reusing work across iterations
> ----------------------------------------------------
>
> Key: FLINK-935
> URL: https://issues.apache.org/jira/browse/FLINK-935
> Project: Flink
> Issue Type: Bug
> Components: Compiler/Optimizer
> Affects Versions: 0.6-incubating, pre-apache-0.5, pre-apache-0.5.1
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Fix For: 0.6-incubating, pre-apache-0.5.2
>
> Attachments: screenshot_plan.png
>
>
> The following created plan is invalid
> {code}
> {
> "nodes": [
> {
> "id": 3,
> "type": "source",
> "pact": "Data Source",
> "contents": "CSV Input (,) /some/file/path",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "0.0" },
> { "name": "Disk I/O", "value": "0.0" },
> { "name": "CPU", "value": "0.0" },
> { "name": "Cumulative Network", "value": "0.0" },
> { "name": "Cumulative Disk I/O", "value": "0.0" },
> { "name": "Cumulative CPU", "value": "0.0" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 2,
> "type": "pact",
> "pact": "Map",
> "contents":
> "eu.stratosphere.pact.compiler.IterationsCompilerTest$DuplicateValue",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 3, "ship_strategy": "Hash Partition on [0]",
> "local_strategy": "Sort on [0:ASC]"}
> ],
> "driver_strategy": "Map",
> "global_properties": [
> { "name": "Partitioning", "value": "HASH_PARTITIONED" },
> { "name": "Partitioned on", "value": "[0]" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "[0:ASC]" },
> { "name": "Grouped on", "value": "[0]" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "(unknown)" },
> { "name": "Disk I/O", "value": "(unknown)" },
> { "name": "CPU", "value": "(unknown)" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "step_function": [
> {
> "id": 9,
> "type": "pact",
> "pact": "Bulk Partial Solution",
> "contents": "Partial Solution",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "global_properties": [
> { "name": "Partitioning", "value": "HASH_PARTITIONED" },
> { "name": "Partitioned on", "value": "[0]" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "[0:ASC]" },
> { "name": "Grouped on", "value": "[0]" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "0.0" },
> { "name": "Disk I/O", "value": "0.0" },
> { "name": "CPU", "value": "0.0" },
> { "name": "Cumulative Network", "value": "0.0" },
> { "name": "Cumulative Disk I/O", "value": "0.0" },
> { "name": "Cumulative CPU", "value": "0.0" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 10,
> "type": "source",
> "pact": "Data Source",
> "contents": "CSV Input (,) /some/file/path",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "0.0" },
> { "name": "Disk I/O", "value": "0.0" },
> { "name": "CPU", "value": "0.0" },
> { "name": "Cumulative Network", "value": "0.0" },
> { "name": "Cumulative Disk I/O", "value": "0.0" },
> { "name": "Cumulative CPU", "value": "0.0" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 8,
> "type": "pact",
> "pact": "Join",
> "contents":
> "eu.stratosphere.pact.compiler.IterationsCompilerTest$Join222",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 9, "side": "first", "ship_strategy": "Forward"},
> {"id": 10, "side": "second", "ship_strategy": "Hash
> Partition on [0]", "local_strategy": "Sort on [0:ASC]", "temp_mode": "CACHED"}
> ],
> "driver_strategy": "Merge",
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "(unknown)" },
> { "name": "Disk I/O", "value": "(unknown)" },
> { "name": "CPU", "value": "(unknown)" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 7,
> "type": "pact",
> "pact": "GroupReduce",
> "contents": "MIN(1)",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 8, "ship_strategy": "Forward"}
> ],
> "driver_strategy": "Sorted Combine",
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "0.0" },
> { "name": "Disk I/O", "value": "0.0" },
> { "name": "CPU", "value": "0.0" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 6,
> "type": "pact",
> "pact": "GroupReduce",
> "contents": "MIN(1)",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 7, "ship_strategy": "Hash Partition on [0]",
> "local_strategy": "Sort (combining) on [0:ASC]"}
> ],
> "driver_strategy": "Sorted Group Reduce",
> "global_properties": [
> { "name": "Partitioning", "value": "HASH_PARTITIONED" },
> { "name": "Partitioned on", "value": "[0]" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "[0:ASC]" },
> { "name": "Grouped on", "value": "[0]" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "(unknown)" },
> { "name": "Disk I/O", "value": "(unknown)" },
> { "name": "CPU", "value": "(unknown)" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 5,
> "type": "pact",
> "pact": "Join",
> "contents":
> "eu.stratosphere.api.java.operators.JoinOperator$DefaultJoinFunction",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 6, "side": "first", "ship_strategy": "Forward"},
> {"id": 9, "side": "second", "ship_strategy": "Forward",
> "temp_mode": "PIPELINE_BREAKER"}
> ],
> "driver_strategy": "Merge",
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "0.0" },
> { "name": "Disk I/O", "value": "(unknown)" },
> { "name": "CPU", "value": "(unknown)" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 4,
> "type": "pact",
> "pact": "FlatMap",
> "contents":
> "eu.stratosphere.pact.compiler.IterationsCompilerTest$FlatMapJoin",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 5, "ship_strategy": "Forward"}
> ],
> "driver_strategy": "Map",
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "0.0" },
> { "name": "Disk I/O", "value": "0.0" },
> { "name": "CPU", "value": "0.0" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> }
> ],
> "partial_solution": 9,
> "next_partial_solution": 4,
> "id": 1,
> "type": "bulk_iteration",
> "pact": "Bulk Iteration",
> "contents": "Bulk Iteration",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 2, "ship_strategy": "Forward"}
> ],
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "(unknown)" },
> { "name": "Disk I/O", "value": "(unknown)" },
> { "name": "CPU", "value": "(unknown)" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> },
> {
> "id": 0,
> "type": "sink",
> "pact": "Data Sink",
> "contents": "Print to System.out",
> "parallelism": "4",
> "subtasks_per_instance": "1",
> "predecessors": [
> {"id": 1, "ship_strategy": "Forward"}
> ],
> "global_properties": [
> { "name": "Partitioning", "value": "RANDOM" },
> { "name": "Partitioning Order", "value": "(none)" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "local_properties": [
> { "name": "Order", "value": "(none)" },
> { "name": "Grouping", "value": "not grouped" },
> { "name": "Uniqueness", "value": "not unique" }
> ],
> "estimates": [
> { "name": "Est. Output Size", "value": "(unknown)" },
> { "name": "Est. Cardinality", "value": "(unknown)" }
> ],
> "costs": [
> { "name": "Network", "value": "0.0" },
> { "name": "Disk I/O", "value": "0.0" },
> { "name": "CPU", "value": "0.0" },
> { "name": "Cumulative Network", "value": "(unknown)" },
> { "name": "Cumulative Disk I/O", "value": "(unknown)" },
> { "name": "Cumulative CPU", "value": "(unknown)" }
> ],
> "compiler_hints": [
> { "name": "Output Size (bytes)", "value": "(none)" },
> { "name": "Output Cardinality", "value": "(none)" },
> { "name": "Avg. Output Record Size (bytes)", "value":
> "(none)" },
> { "name": "Filter Factor", "value": "(none)" }
> ]
> }
> ]
> }
> {code}
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