trait WriteJobStatsTracker extends Serializable
A class implementing this trait is basically a collection of parameters that are necessary for instantiating a (derived type of) WriteTaskStatsTracker on all executors and then process the statistics produced by them (e.g. save them to memory/disk, issue warnings, etc). It is therefore important that such an objects is Serializable, as it will be sent from the driver to all executors.
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- abstract def newTaskInstance(): WriteTaskStatsTracker
Instantiates a WriteTaskStatsTracker, based on (non-transient) members of this class.
Instantiates a WriteTaskStatsTracker, based on (non-transient) members of this class. To be called by executors.
- returns
A WriteTaskStatsTracker instance to be used for computing stats during a write task
- abstract def processStats(stats: Seq[WriteTaskStats], jobCommitTime: Long): Unit
Process the given collection of stats computed during this job.
Process the given collection of stats computed during this job. E.g. aggregate them, write them to memory / disk, issue warnings, whatever.
- stats
One WriteTaskStats object from each successful write task.
- jobCommitTime
Time of committing the job.
- Note
The type of @param
statsis too generic. These classes should probably be parametrized: WriteTaskStatsTracker[S <: WriteTaskStats] WriteJobStatsTracker[S <: WriteTaskStats, T <: WriteTaskStatsTracker[S]] and this would then be: def processStats(stats: Seq[S]): Unit but then we wouldn't be able to have a Seq[WriteJobStatsTracker] due to type co-/contra-variance considerations. Instead, you may feel free to just caststatsto the expected derived type when implementing this method in a derived class. The framework will make sure to call this with the right arguments.
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