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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Thu, 11 Feb 2010 22:19:56 -0000
Message-ID: <20100211221956.9876.32418@eos.apache.org>
Subject: 
 =?utf-8?q?=5BPig_Wiki=5D_Update_of_=22LoadStoreMigrationGuide=22_by_Prade?=
 =?utf-8?q?epKamath?=

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Pig Wiki" for chang=
e notification.

The "LoadStoreMigrationGuide" page has been changed by PradeepKamath.
http://wiki.apache.org/pig/LoadStoreMigrationGuide?action=3Ddiff&rev1=3D15&=
rev2=3D16

--------------------------------------------------

  =3D=3D Table mapping old API calls to new API calls in rough order of cal=
l sequence =3D=3D
  || '''Old Method in !StoreFunc''' || '''Equivalent New Method''' || '''Ne=
w Class/Interface in which method is present''' || '''Explanation''' ||
  || No equivalent method || setStoreFuncUDFContextSignature() || !StoreFun=
c || This method will be called by Pig both in the front end and back end t=
o pass a unique signature to the Storer. The signature can be used to store=
 into the UDFContext} any information which the Storer needs to store betwe=
en various method invocations in the front end and back end.||
- || No equivalent method || relToAbsPathForStoreLocation() || !StoreFunc |=
| Pig runtime will call this method to allow the Storer to convert a relati=
ve load location to an absolute location. An implementation is provided in =
!LoadFunc (as a static method) which handles this for hdfs files and direct=
ories. =

+ || No equivalent method || relToAbsPathForStoreLocation() || !StoreFunc |=
| Pig runtime will call this method to allow the Storer to convert a relati=
ve load location to an absolute location. An implementation is provided in =
!LoadFunc (as a static method) which handles this for hdfs files and direct=
ories.||
  || No equivalent method || checkSchema() || !StoreFunc || A Store functio=
n should implement this function to check that a given schema is acceptable=
 to it ||
  || No equivalent method || setStoreLocation() || !StoreFunc || This metho=
d is called by Pig to communicate the store location to the storer. The sto=
rer should use this method to communicate the same information to the under=
lying !OutputFormat. This method is called multiple times by pig - implemen=
tations should bear in mind that this method is called multiple times and s=
hould ensure there are no inconsistent side effects due to the multiple cal=
ls.||
  || getStorePreparationClass() || getOutputFormat() || In the old API, get=
StorePreparationClass() was the means by which the implementation could com=
municate to Pig the !OutputFormat to use for writing - this is now achieved=
 through getOutputFormat(). getOutputFormat() is NOT an optional method and=
 implementation SHOULD provide an !OutputFormat to use. The methods in the =
!OutputFormat (and underlying !RecordWriter and !OutputCommitter) will be c=
alled by pig in the same manner (and in the same context) as by Hadoop in a=
 map-reduce java program.||