snowplow / scala-maxmind-iplookups / 22137919873

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Avoid off-heap memory growth from JDK direct buffer caching (#186)

Open database files via FileInputStream and pass to the InputStream-based
DatabaseReader.Builder constructor, instead of passing a File which
internally uses FileChannel.read into a heap ByteBuffer. The FileChannel
path causes the JDK to allocate and cache temporary direct ByteBuffers
in thread-local storage (sun.nio.ch.Util.BufferCache), leading to
off-heap memory growth in scenarios where the database is initialized
repeatedly.

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