The DFSInputStream read-path always copies bytes into a JVM-allocated byte[]. Although for many clients this is desired behaviour, in certain situations, such as native-reads through libhdfs, this imposes an extra copy penalty since the byte[] needs to be copied out again into a natively readable memory area. For these cases, it would be preferable to allow the client to supply its own buffer, wra
Currently, one of the weak points of the HA design is that it relies on shared storage such as an NFS filer for the shared edit log. One alternative that has been proposed is to depend on BookKeeper, a ZooKeeper subproject which provides a highly available replicated edit log on commodity hardware. This JIRA is to implement another alternative, based on a quorum commit protocol, integrated more ti
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