bakaid commented on a change in pull request #715: MINIFICPP-1126 - Reduce
sawtooth in memory usage of rocksdb flowfile …
URL: https://github.com/apache/nifi-minifi-cpp/pull/715#discussion_r371838409
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File path: extensions/rocksdb-repos/FlowFileRepository.h
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@@ -105,8 +105,15 @@ class FlowFileRepository : public core::Repository,
public std::enable_shared_fr
options.create_if_missing = true;
options.use_direct_io_for_flush_and_compaction = true;
options.use_direct_reads = true;
+
+ // Write buffers are used as db oepration logs. When they get filled the
events are merged and serialized.
+ // The default size is 64MB.
+ // In our case it's usually too much, causing sawtooth in memory
consumption. (Consumes more than the whole MiniFi)
+ // To avoid DB write issues during heavy load it's recommended to have
high number of buffer.
+ // Rocksdb's stall featur can also trigger in case the number of buffers
is >= 3.
Review comment:
typo: featur -> feature
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