Weiwei Yang created HDFS-12443:
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Summary: Ozone: Improve SCM block deletion throttling algorithm
Key: HDFS-12443
URL: https://issues.apache.org/jira/browse/HDFS-12443
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ozone, scm
Reporter: Weiwei Yang
Assignee: Weiwei Yang
Currently SCM scans delLog to send deletion transactions to datanode
periodically, the throttling algorithm is simple, it scans at most
{{BLOCK_DELETE_TX_PER_REQUEST_LIMIT}} (by default 50) at a time. This is
non-optimal, worst case it might cache 50 TXs for 50 different DNs so each DN
will only get 1 TX to proceed in an interval, this will make the deletion slow.
An improvement to this is to make this throttling by datanode, e.g 50 TXs per
datanode per interval.
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