payert opened a new pull request #3242:
URL: https://github.com/apache/ambari/pull/3242
## What changes were proposed in this pull request?
The data migration code only looks for the metrics that are present in the
whitelist file. This is true even in the case when the AMS Whitelisting is not
enabled. The user will only have those metrics migrated that are present in the
whitelist file, which is usually not all that are required.
**The proposed change #1:**
- If whitelist file parameter is provided then
- migrate only the metrics that are in the whitelist file
- if whitelist file parameter is not provided then
- if whitelisting is enabled then
- discover the whitelist file configured in AMS and
migrate only the metrics that are in the whitelist file
- if whitelisting is disabled then
- migrate all the metrics present in the database
**The proposed change #2:**
Furthermore, the migration process frequently dies silently while saving the
metadata. To fix this, the change suggests removing the initiating of saving
metadata from the shutdown hook and call it "normally" in a _finally_ block.
**The proposed change #3:**
Code cleanup.
## How was this patch tested?
The patch was tested by manual data migrations.
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