Fangyuan Deng created HDFS-11942:
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Summary: make new chooseDataNode policy work in more operation
like seek, fetch
Key: HDFS-11942
URL: https://issues.apache.org/jira/browse/HDFS-11942
Project: Hadoop HDFS
Issue Type: Sub-task
Components: hdfs-client
Affects Versions: 2.7.0, 2.6.0
Reporter: Fangyuan Deng
in default policy, if a file is ONE_SSD, client will prior read the local disk
replica rather than the remote ssd replica.
but now, the pci-e SSD and 10G ethernet make remote read SSD more faster than
the local disk.
HDFS-9666 give us a patch, but the code is not complete and not updated for a
long time.
this issue give a complete patch and
we have tested on three machines [ 32 core cpu, 128G mem , 1000M network, 1.2T
HDD, 800G SSD(intel P3600) ].
with this feather, throughput of hbase table(ONE_SSD) is double of which
without this feather
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