sigram opened a new pull request #60:
URL: https://github.com/apache/solr/pull/60
The solution implemented in this PR is a loose port of the `SimScenario`
package from Solr 8.x, which was designed for running reproducible scenarios
for the autoscaling framework.
I re-worked the DSL and removed commands that are not applicable in the
current context. The functionality is as follows:
* two scripts can be supplied using system properties: `-DinitScript=...`
and `-DshutdownScript=...`, which specify a text file resource (either absolute
or relative to Solr home).
* each script consists of series of operations that perform collection
commands (plus some rudimentary conditionals, wait for state, asserts, etc)
* operation parameters may use variable substitution, using either system
properties or references to results of the previous operations. A shared
context is provided where scripts may keep additional state between operations.
* several context variables are filled in based on the current node
environment.
Example of an init script that uses a context variable `_node_name_` and a
set of system properties defined by user: `collection`, `shard` to add a
replica after startup and make sure it's operational - and if not the script
will shut down the `CoreContainer`:
```
# any errors will result in CC shutdown
set key=_error_handling_&value=FATAL
# request ADDREPLICA using sysprop values for collection and shard, and a
context var for this node name
request
/admin/collections?action=ADDREPLICA&collection=${collection}&shard=${shard}&type=NRT&node=${_node_name_}
# put the resulting core name in a context var 'newReplica'
set key=newReplica&value=${_last_result_/result/success[0]/value/core}
# wait for the new replica to become active
wait_replica collection=${collection}&core=${newReplica}&state=ACTIVE
# log replica name
log
key=_last_result_/result[0]/key&format=******%20Replica%20name:%20{}%20******
# end of script
```
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