Shalin Shekhar Mangar created SOLR-11036:
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Summary: MetricsHandler should report disk stats for solr.data.home
Key: SOLR-11036
URL: https://issues.apache.org/jira/browse/SOLR-11036
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: metrics, SolrCloud
Affects Versions: 7.0
Reporter: Shalin Shekhar Mangar
Fix For: 7.0
The totalSpace and usableSpace reported by Metrics API are still based on
coreRootDirectory (which is used as the instance dir for individual cores).
SOLR-6671 introduced a new solr.data.home configuration for the root directory
of all data dirs. So we should expose data home's disk metrics as well.
Since the current metric names are just totalSpace and usableSpace under the
Container group, we need to figure out how to differentiate between them and
the data home's metrics. A few options:
# We can introduce new metrics such as dataHomeTotalSpace and
dataHomeUsableSpace.
# We use the current names for the data home's metrics and introduce new ones
for coreRootDirectory
I lean towards #2 because of backcompat reasons. Existing users (and monitoring
vendors/products) would be using the existing metric names to track disk stats
for their solr installations. If a user configures a solr.data.home then they
shouldn't get a surprise one day if the data home directory runs out of space
when they have monitoring already in place which used to work for earlier
versions of Solr. The probability of surprise still exists because one fine day
you can run out of space for the coreRootDirectory and solr will refuse to
create any cores but that is a less likely scenario than running out of disk
space because of increasing size of data directories.
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