stream the edit segments to NameNode when NameNode starts up
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Key: HDFS-3300
URL: https://issues.apache.org/jira/browse/HDFS-3300
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Brandon Li
Edit logs are saved on Journal daemon. When NameNode starts, it loads the
latest image file and then streams the edit logs from an active Journal daemon.
Currently we are using http to transfer edit files between two journal
daemons/nodes or between a journal daemon and a NameNode. To get edit file from
Journal daemon, the NameNode has to download it first and then read it from the
disk.
To avoid the slow start-up time, NameNode should be enhance to read the http
data stream and update its in memory name space instead of saving the streamed
data on disk first.
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