sanjaykumar 81e7030f7f [ZEPPELIN-3825] Allow custom service account for GCSNotebookRepo ... ### What is this PR for? The current implementation uses the default google applications service account to establish a connection with GCS. We cannot specify a custom service account for the connection with the existing implementation. This PR enables the same. * Added ZEPPELIN_NOTEBOOK_GCS_CREDENTIALS_FILE to ConfVars * Added functionality in GCSNotebookRepo and OldGCSNotebookRepo to get credentials from CREDENTIALS_FILE * Updated doc string and documentation ### What type of PR is it? [Improvement] ### Todos * None ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-3825 ### How should this be tested? * Create a new service account that has access to write to google cloud storage. * Disable Google Storage access to the default application service account. * Build and deploy zeppelin after updating zeppelin.notebook.gcs.credentialsJsonFilePath in zeppelin-site.xml * Validate that new notes are being written to GCS bucket ### Screenshots (if appropriate) * None ### Questions: * Does the licenses files need update? -No * Is there breaking changes for older versions? - No * Does this needs documentation? - Yes. Existing documentation has been updated to reflect the same. Author: sanjaykumar <sanjay.kumar@shopkick.com> Closes #3207 from 88sanjay/ZEPPELIN-3825 and squashes the following commits: 15c8aa0fb [sanjaykumar] Merge branch 'master' into ZEPPELIN-3825 84b8da4d5 [sanjaykumar] ZEPPELIN-3825. Allow custom service account for GCSNotebookRepo		2018-11-05 16:37:52 -08:00
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storage.md	[ZEPPELIN-3825] Allow custom service account for GCSNotebookRepo	2018-11-05 16:37:52 -08:00