Shalin Shekhar Mangar created SOLR-11038:
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             Summary: Fix AutoScalingSnitch's use of usableSpace metrics to 
account for solr.data.home and dataDir in solrconfig.xml
                 Key: SOLR-11038
                 URL: https://issues.apache.org/jira/browse/SOLR-11038
             Project: Solr
          Issue Type: Sub-task
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling, metrics
    Affects Versions: 7.0
            Reporter: Shalin Shekhar Mangar
             Fix For: 7.1


SOLR-6671 and related issues SOLR-11036 and SOLR-11037 made me realize that 
computing free disk available in order to place new replicas on nodes is not as 
trivial as currently implemented.

Today we just use the {{metrics/solr.node/CONTAINER.fs.usableSpace}} metric 
which returns the usableSpace of the coreRootDirectory. But it has the 
following problems:
# The solrconfig.xml of the collection's configset may specify a different path 
than coreRootDirectory
# If solr.data.home is specified as a system property on the node then we must 
use that directory's usableSpace
# For both of the above, we must also use the coreRootDirectory's usableSpace 
for correctness otherwise the node will flat out refuse to create a core 
because it cannot create a core.properties on disk.



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