Interface FileRotationPolicy
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- All Superinterfaces:
Serializable
- All Known Implementing Classes:
FileSizeRotationPolicy,NoRotationPolicy,TimedRotationPolicy
public interface FileRotationPolicy extends Serializable
Used by the HdfsBolt to decide when to rotate files.The HdfsBolt will call the
mark()method for every tuple received. If themark()method returnstruethe HdfsBolt will perform a file rotation.After file rotation, the HdfsBolt will call the
reset()method.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description booleanmark(long offset)Check if a file rotation should be performed based on the offset at which file is being written.booleanmark(TridentTuple tuple, long offset)Called for every tuple the HdfsBolt executes.voidreset()Called after the HdfsBolt rotates a file.voidstart()Start the policy.
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Method Detail
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mark
boolean mark(TridentTuple tuple, long offset)
Called for every tuple the HdfsBolt executes.- Parameters:
tuple- The tuple executed.offset- current offset of file being written- Returns:
- true if a file rotation should be performed
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mark
boolean mark(long offset)
Check if a file rotation should be performed based on the offset at which file is being written.- Parameters:
offset- the current offset of file being written- Returns:
- true if a file rotation should be performed.
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reset
void reset()
Called after the HdfsBolt rotates a file.
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start
void start()
Start the policy. Useful in case of policies like timed rotation where the timer can be started.
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