THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
This wiki tracks developer-testing for NextGenMapReduce.
This aim of this document is to capture various failure handling scenarios for MapReduce applications running under YARN and the YARN framework itself.
Failure scenarios
User task error
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
RM is immediately notified of error by NM with appropriate error code/status-msg |
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CapacityScheduler releases resources for queue, user and application |
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RM notifies AM about status (including error code) of the container |
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AM fails the task attempt |
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AM re-runs task-attempt before other 'virgin' tasks on a different node |
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User task error, same task fails 4 times
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
RM is immediately notified of error by NM with appropriate error code/status-msg |
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CapacityScheduler releases resources for queue, user and application |
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RM notifies AM about status (including error code) of the container |
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AM fails the task attempt |
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AM re-runs task-attempt before other 'virgin' tasks on a different node |
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AM fails the MapReduce job and exits |
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Container failure
Localization error
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
RM is immediately notified of error by NM with appropriate error code/status-msg |
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CapacityScheduler releases resources for queue, user and application |
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RM notifies AM about status (including error code) of the container |
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AM fails the task attempt |
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AM re-runs task-attempt before other 'virgin' tasks on a different node |
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Exceeding memory or disk limits
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
RM is immediately notified of error by NM with appropriate error code/status-msg |
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CapacityScheduler releases resources for queue, user and application |
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RM notifies AM about status (including error code) of the container |
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AM fails the task attempt |
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AM re-runs task-attempt before other 'virgin' tasks on a different node |
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Lost map output or faulty NM Netty
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
Reduces report shuffle failure errors to AM |
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On sufficient fetch-failure notifications the AM re-runs map |
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User fails/kills map or reduce task
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
RM is immediately notified of error by NM with appropriate error code/status-msg |
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CapacityScheduler releases resources for queue, user and application |
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RM notifies AM about status (including error code) of the container |
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AM fails the task attempt |
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AM re-runs task-attempt before other 'virgin' tasks on a different node |
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Node failure due to timeout or health-check error
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
RM fails all running containers and informs appropriate AMs |
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Shuffle failures for completed map containers... handled (aggressively?) by AM |
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AM re-runs running task-attempts and completed maps |
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MapReduce AM failure
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
NM notifies RM |
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CapacityScheduler releases resources for queue, user and application |
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ASM recognises AM failure |
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ASM kills all running containers |
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ASM restarts MapReduce AM |
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MapReduce AM recovers and re-runs only non-complete tasks |
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ResourceManager bounce
Corrective measures |
Developer(s) verifying the corrective measures |
Date(s) |
RM recovers all running AMs |
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RM recovers all running containers |
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RM rebuilds CapacityScheduler queue & user capacities |
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MapReduce AMs re-runs only non-complete tasks |
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