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public interface Target
A Target
represents the output destination of a Crunch PCollection
in the context of a Crunch job.
Nested Class Summary | |
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static class |
Target.WriteMode
An enum to represent different options the client may specify for handling the case where the output path, table, etc. |
Method Summary | ||
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boolean |
accept(OutputHandler handler,
PType<?> ptype)
Checks to see if this Target instance is compatible with the
given PType . |
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asSourceTarget(PType<T> ptype)
Attempt to create the SourceTarget type that corresponds to this Target
for the given PType , if possible. |
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void |
handleExisting(Target.WriteMode writeMode,
org.apache.hadoop.conf.Configuration conf)
Apply the given WriteMode to this Target instance. |
Method Detail |
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void handleExisting(Target.WriteMode writeMode, org.apache.hadoop.conf.Configuration conf)
WriteMode
to this Target
instance.
writeMode
- The strategy for handling existing outputsconf
- The ever-useful Configuration
instanceboolean accept(OutputHandler handler, PType<?> ptype)
Target
instance is compatible with the
given PType
.
handler
- The OutputHandler
that is managing the output for the jobptype
- The PType
to check
PType
,
false otherwise<T> SourceTarget<T> asSourceTarget(PType<T> ptype)
SourceTarget
type that corresponds to this Target
for the given PType
, if possible. If it is not possible, return null
.
ptype
- The PType
to use in constructing the SourceTarget
SourceTarget
or null if such a SourceTarget
does not exist
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