History

Giambattista Bloisi e64c2854a3 Refactor Dedup process to use Spark Dataframe API and intermediate representation with Row interface JsonPath cache contention fixed by using a ConcurrentHashMap Blacklist filtering performance improvement Minor performance improvements when evaluating similarity Sorting in clustered elements is deterministic (by ordering and identity field, instead of ordering field only)		2023-07-24 15:36:24 +02:00
..
src	Refactor Dedup process to use Spark Dataframe API and intermediate representation with Row interface	2023-07-24 15:36:24 +02:00
.scalafmt.conf	[stats-wf]fixed the result_result table related to PR#191	2022-02-04 14:51:25 +01:00
README.md	README.md for aggregation workflows	2021-03-03 16:18:34 +01:00
pom.xml	Use scala.binary.version property to resolve scala maven dependencies	2023-07-24 11:13:48 +02:00

README.md

Description of the Module

This module defines a set of oozie workflows for the collection and transformation of metadata records. Both workflows interact with the Metadata Store Manager (MdSM) to handle the logical transactions required to ensure the consistency of the read/write operations on the data as the MdSM in fact keeps track of the logical-physical mapping of each MDStore.

Metadata collection

The metadata collection workflow is responsible for harvesting metadata records from different protocols and responding to different formats and to store them as on HDFS so that they can be further processed.

Collector Plugins

Different protocols are managed by dedicated Collector plugins, i.e. java programs implementing a defined interface:

eu.dnetlib.dhp.collection.plugin.CollectorPlugin

The list of the supported plugins:

OAI Plugin: collects from OAI-PMH compatible endpoints
MDStore plugin: collects from a given D-Net MetadataStore, (identified by moogodb URI, dbName, MDStoreID)
MDStore dump plugin: collects from an MDStore dump stored on the HDFS location indicated by the path parameter

Transformation Plugins

TODO