keith-turner commented on issue #3078:
URL: https://github.com/apache/accumulo/issues/3078#issuecomment-1315963932
>It's in the
[BlockSender.close](https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java#L480)
in the DataNode. So, after it sends the block to the client, it may (depending
on the specified options) set POSIX_FADV_DONTNEED on a range of the file
descriptor for the file (that is that block).
If it reads the entire block and drops it from cache after reading it, then
I suppose the smaller the hadoop block size the better it is for the cache in
that case.
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