Added support for parameterized PailStructures

[derrickburns]

1. Made PailTap#_pailRoot protected instead of private.
2. Added PailTap#getPaths() method to provide paths to all subPail roots.
3. Added Jackson 2.0 annotations to PailStructure to support Jackson serialization.
4. Retry rename() in AbstractPail#close() because failure is costly!
5. Serialize PailStructure into pail.meta files using Jackson 2.0. This allows PailStructures to be parameterized. This is done in a backward compatible way. Old meta files with PailStructures that take no arguments still work. However, new pail.meta files will be created by emitting not just the PailStructure class name, but a Jackson 2.0 serialization of the PailStructure. This is typically very compact, for example:

---
format: SequenceFile
structure: '{"@class":"com.rincaro.mapreduce.store.timeseriesstore.TemplateTimeSeriesPailStructure","template":"${type}"}'
args: {}

This declares a PailStructure that takes a single argument, "template", with value "${type}".

Here is the corresponding constructor with Jackson 2.0 annotations:

    @JsonCreator
    public TemplateTimeSeriesPailStructure( @JsonProperty("template") String template ) {
        mTemplate = template;
    }

    public String getTemplate() {
        return mTemplate;
    }

1. Added pom.xml. If you don't want it, just ignore it. :)

[kul]

👍

[sritchie]

@sorenmacbeth, what do you think? big change here.

[kul]

@sorenmacbeth Please sort this out. the number and kind of pull requests already show that this kind of feature is most desirable for api users. 😄

[kul]

The pull request looks like a dead end as it seems that author has developed it into a person project. Whole code organization is changed even the Build files for scala are deleted. although this could have been the most elegant way to support dynamic pail structures. 😢 commits can be cherry picked but, seems like rewriting support for Jackson would be more easier!

[derrickburns]

Yes, I wrote the pull request. After no action was taken, I dealt with the many other issues that arose. 

Cherry picking the Jackson support would be easy....

—
Sent from Mailbox for iPhone

On Fri, Sep 13, 2013 at 10:01 PM, kul [email protected] wrote:

The pull request looks like a dead end as it seems that author has developed it into a person project. Even the Build files for scala are deleted. although this could have been the most elegant way to support dynamic pail structures. 😢 Although commits can be cherry picked but, seems like rewriting support for Jackson would be more easier!

Reply to this email directly or view it on GitHub:
#17 (comment)