Xiaoyu Yao created HADOOP-13128:
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Summary: Manage Hadoop RPC resource usage via resource coupon
Key: HADOOP-13128
URL: https://issues.apache.org/jira/browse/HADOOP-13128
Project: Hadoop Common
Issue Type: Improvement
Reporter: Xiaoyu Yao
Assignee: Xiaoyu Yao
HADOOP-9640 added RPC Fair Call Queue and HADOOP-10597 added RPC backoff to
ensure the fairness usage of the HDFS namenode resources. YARN, the Hadoop
cluster resource manager currently manages the CPU and Memory resources for
jobs/tasks but not the storage resources such as HDFS namenode and datanode
usage directly. As a result of that, a high priority Yarn Job may send too many
RPC requests to HDFS namenode call queue and get demoted into low priority
namenode call queue due to lack of coordination.
To better support multi-tenancy use cases like above, we propose to manage RPC
server resource usage via coupon mechanism integrated with YARN. The idea is to
allow YARN request HDFS storage resource coupon (e.g., namenode RPC calls,
datanode I/O bandwidth) from namenode on behalf of the job upon submission
time. Once granted, the tasks will include the coupon identifier in RPC header
for the subsequent calls. HDFS namenode RPC scheduler maintains the state of
the coupon usage based on the scheduler policy (fairness or priority) to match
the RPC priority with the YARN scheduling priority.
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