Support nested directories with multiple segment files in the HDFS endpoint
consumer
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Key: CAMEL-4555
URL: https://issues.apache.org/jira/browse/CAMEL-4555
Project: Camel
Issue Type: Improvement
Components: camel-hdfs
Affects Versions: 2.8.1
Reporter: Ben Hoyt
A common pattern in HDFS is for multiple segment files underneath a given
directory, representing the fragments of data. Lots of tools understand to
automatically merge these segment files (ie hadoop fs -getmerge, pig script
loaders). This patch does the same for the HDFS consumer, using a temporary
local directory for the merging.
Additionally, tools like pig and oozie understand to look for a _SUCCESS file
in one of these directories containing segments. This file indicates that the
segments have been completely written. This patch additionally skips the
directory if a _SUCCESS file is not present.
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