Add pid file to snapinstaller to skip script overruns, and recover from faliure
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Key: SOLR-990
URL: https://issues.apache.org/jira/browse/SOLR-990
Project: Solr
Issue Type: Improvement
Components: replication (scripts)
Reporter: Dan Rosher
Priority: Minor
The pid file will allow snapinstaller to be run as fast as possible without
overruns. Also it will recover from a last failed run should an older
snapinstaller process no longer be running.
Avoiding overruns means that snapinstaller can be run as fast as possible, but
without suffering from the performance issue described here:
http://wiki.apache.org/solr/SolrPerformanceFactors#head-fc7f22035c493431d58c5404ab22aef0ee1b9909
This means that one can do the following
*/1 * * * * ..../bin/snappuller && ..../bin/snapinstaller
Even with a 'properly tuned' setup, there can be times where snapinstaller can
suffer from overruns due to a lack of resources, or an unoptimized index using
more resources etc.
currently the pid will live in /tmp ... perhaps it should be in the logs dir?
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