Shalin Shekhar Mangar created SOLR-9454:
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Summary: Reduce object allocation during indexing because of
JavaBinCodec.writeExternString()
Key: SOLR-9454
URL: https://issues.apache.org/jira/browse/SOLR-9454
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud, update
Reporter: Shalin Shekhar Mangar
Fix For: master (7.0), 6.3
I setup Java Flight Recorder to profile indexing a 650MB JSON file using
bin/post on 2 shard, 2 replica setup. It shows that the
JavaBinCodec.writeExternString(String) method contributes a lot of garbage
during indexing in SolrCloud. More specifically, it contributes ~1GB of
HashMap$Node objects and ~450MB of HashMap$Node[] objects.
Most of this allocation is because every request is serialized using a new
instance of JavaBinUpdateRequestCodec which internally allocates a new HashMap
for storing the extern strings.
We should explore keeping a global extern string map to eliminate redundant
allocations.
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