Bruno Roustant created SOLR-17036:
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Summary: Lazy create VersionBucket in the update log to free
memory.
Key: SOLR-17036
URL: https://issues.apache.org/jira/browse/SOLR-17036
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Bruno Roustant
Each time an UpdateLog is created for a SolrCore, its VersionInfo creates a
large array of 65536 VersionBucket. This takes 1.5 MB in memory even for an
empty core (computed with RamUsageEstimator). So when the number of core
increases, this memory starts to weight.
We propose to modify VersionInfo to not create the large array of VersionBucket
at initialization. Instead start with a hash map, and replace it by the array
if it grows beyond the threshold. In addition, BucketVersion instances are
created lazily.
As a result
- Empty cores require much less memory.
- Cores with no update will not fill the map.
- Cores with less updates before they are closed will stay with a small sized
map.
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