[#HADOOP-6105] Provide a way to automatically handle backward compatibility of deprecated keys

Hadoop Common

Provide a way to automatically handle backward compatibility of deprecated keys

Created: 25/Jun/09 09:51 AM Updated: 08/Sep/09 11:09 AM

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Component/s:

conf

Affects Version/s:

None

Fix Version/s:

0.21.0

Time Tracking:

Not Specified

File Attachments:

File Name	Date Attached	Attached By	Size
HADOOP-6105-1.patch	2009-08-03 05:16 AM	V.V.Chaitanya Krishna	15 kB
HADOOP-6105-10.patch	2009-09-07 09:36 AM	V.V.Chaitanya Krishna	26 kB
HADOOP-6105-2.patch	2009-08-06 09:29 AM	V.V.Chaitanya Krishna	21 kB
HADOOP-6105-3.patch	2009-08-12 04:19 AM	V.V.Chaitanya Krishna	21 kB
HADOOP-6105-4.patch	2009-08-13 03:32 AM	V.V.Chaitanya Krishna	21 kB
HADOOP-6105-5.patch	2009-08-18 11:05 AM	V.V.Chaitanya Krishna	21 kB
HADOOP-6105-6.patch	2009-09-01 06:43 AM	V.V.Chaitanya Krishna	21 kB
HADOOP-6105-7.patch	2009-09-02 06:03 PM	V.V.Chaitanya Krishna	23 kB
HADOOP-6105-8.patch	2009-09-03 09:22 AM	V.V.Chaitanya Krishna	23 kB
HADOOP-6105-9.patch	2009-09-07 04:37 AM	V.V.Chaitanya Krishna	26 kB
HADOOP-6105.patch	2009-08-06 06:48 AM	V.V.Chaitanya Krishna	20 kB
HADOOP-6105.patch	2009-07-27 06:54 AM	V.V.Chaitanya Krishna	17 kB

Issue Links:

Blocker

This issue blocks:

~~HADOOP-6233~~ Changes in common to rename the config keys as detailed in HDFS-531.

~~MAPREDUCE-849~~ Renaming of configuration property names in mapreduce

Reference

This issue relates to:

~~HADOOP-6243~~ NPE in handling deprecated configuration keys.

~~HADOOP-6234~~ Permission configuration files should use octal and symbolic

dependent

This issue is depended upon by:

HDFS-531 Renaming of configuration keys

Hadoop Flags:	Reviewed
Resolution Date:	07/Sep/09 03:27 PM

Description

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There are cases when we have had to deprecate configuration keys. Use cases include, changing the names of variables to better match intent, splitting a single parameter into two - for maps, reduces etc.

In such cases, we typically provide a backwards compatible option for the old keys. The handling of such cases might typically be common enough to actually add support for it in a generic fashion in the Configuration class. Some initial discussion around this started in HADOOP-5919, but since the project split happened in between we decided to open this issue to fix it in common.