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[HDFS-4184] Add the ability for Client to provide more hint information for DataNode to manage the OS buffer cache more accurate - HDFS - [issue]
...HDFS now has the ability to use posix_fadvise and sync_data_range syscalls to manage the OS buffer cache.When hbase read hlog the data we can set dfs.datanode.drop.cache.behind.reads to true...
http://issues.apache.org/jira/browse/HDFS-4184    Author: binlijin, 2013-05-28, 18:33
[HDFS-3587] Direct write the packet to datanode when dataQueue is empty - HDFS - [issue]
...Current when FSDataOutputStream's write and sync method are called a new Packet may be created and put into dataQueue, the daemon DataStreamer will get packet from the dataQueue and write to...
http://issues.apache.org/jira/browse/HDFS-3587    Author: binlijin, 2012-07-02, 16:51
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