Suresh Srinivas created HDFS-4990:
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Summary: Block placement for storage types
Key: HDFS-4990
URL: https://issues.apache.org/jira/browse/HDFS-4990
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Reporter: Suresh Srinivas
Currently block location for writes are made based on:
# Datanode load (number of transceivers)
# Space left on datanode
# Topology
With storage abstraction, namenode must choose a storage instead of a datanode
for block placement. It also needs to consider storage type, load on the
storage etc.
As an additional benefit, currently HDFS support heterogeneous nodes (nodes
with different number of spindles etc.) poorly. This work should help solve
that issue as well.
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