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Shohei Okumiya commented on TEZ-4569: ------------------------------------- I created a test case to reproduce the issue first. The [testTableScanTemporalFailure|https://github.com/okumin/tez/commit/deac035274bd0b958fbfdf3557dc7120c16fddc5#diff-ad65a331fa51a07f3cc5301ca7df09c199e9730a6f889bc8b1859554ccfc0519R199-R217] is the most straightforward reproduction. {code:java} 2024-06-11 20:18:55,719 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - DAG: State: RUNNING Progress: 200% TotalTasks: 1 Succeeded: 2 Running: 0 Failed: 0 Killed: 0 KilledTaskAttempts: 1 2024-06-11 20:18:55,720 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - VertexStatus: VertexName: TableScan Progress: 100% TotalTasks: 1 Succeeded: 1 Running: 0 Failed: 0 Killed: 0 KilledTaskAttempts: 1 2024-06-11 20:18:55,721 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - VertexStatus: VertexName: Aggregation Progress: 100% TotalTasks: 1 Succeeded: 1 Running: 0 Failed: 0 Killed: 0 2024-06-11 20:18:55,721 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - VertexStatus: VertexName: MapJoin Progress: 0% TotalTasks: -1 Succeeded: 0 Running: 0 Failed: 0 Killed: 0 2024-06-11 20:19:00,756 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - DAG: State: RUNNING Progress: 200% TotalTasks: 1 Succeeded: 2 Running: 0 Failed: 0 Killed: 0 KilledTaskAttempts: 1 2024-06-11 20:19:00,757 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - VertexStatus: VertexName: TableScan Progress: 100% TotalTasks: 1 Succeeded: 1 Running: 0 Failed: 0 Killed: 0 KilledTaskAttempts: 1 2024-06-11 20:19:00,757 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - VertexStatus: VertexName: Aggregation Progress: 100% TotalTasks: 1 Succeeded: 1 Running: 0 Failed: 0 Killed: 0 2024-06-11 20:19:00,758 INFO [Time-limited test] client.DAGClientImpl (DAGClientImpl.java:log(709)) - VertexStatus: VertexName: MapJoin Progress: 0% TotalTasks: -1 Succeeded: 0 Running: 0 Failed: 0 Killed: 0 {code} > SCATTER_GATHER + BROADCAST hangs on DAG Recovery > ------------------------------------------------ > > Key: TEZ-4569 > URL: https://issues.apache.org/jira/browse/TEZ-4569 > Project: Apache Tez > Issue Type: Improvement > Affects Versions: 0.10.3 > Reporter: Shohei Okumiya > Assignee: Shohei Okumiya > Priority: Major > Attachments: image-2024-06-11-20-45-12-540.png > > > A Tez DAG fails to initialize itself when an Application Master is timely > preempted. > > The problem typically happens with Map Join(Broadcast Hash Join) of Hive when > the broadcast edge is multi-staged. In the following case, the smaller side > includes one aggregation, and the condition is satisfied. > > {code:java} > CREATE TABLE small AS SELECT 1 AS id; > CREATE TABLE big AS SELECT 1 AS id UNION ALL SELECT 2 AS id UNION ALL SELECT > 3 AS id; > SELECT * > FROM big > JOIN (SELECT id, count(*) AS num FROM small GROUP BY id) s ON big.id = s.id > {code} > Once it happens, a retried AM fails to configure the Map Join vertex. In the > following case, Map 1 never starts. > > > {code:java} > ---------------------------------------------------------------------------------------------- > VERTICES MODE STATUS TOTAL COMPLETED RUNNING PENDING > FAILED KILLED > ---------------------------------------------------------------------------------------------- > Map 2 .......... container SUCCEEDED 1 1 0 0 > 0 1 > Reducer 3 ...... container SUCCEEDED 1 1 0 0 > 0 0 > Map 1 container INITIALIZING -1 0 0 -1 > 0 0 > ---------------------------------------------------------------------------------------------- > {code} > Tez starts Map 2 and Map 1 once their splits are configured. The hang issue > happens when an AM is retried before it starts Reducer 3. > !image-2024-06-11-20-45-12-540.png! > -- This message was sent by Atlassian Jira (v8.20.10#820010)