Erik Krogen created HDFS-13150:
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Summary: Create fast path for SbNN tailing edits from JNs
Key: HDFS-13150
URL: https://issues.apache.org/jira/browse/HDFS-13150
Project: Hadoop HDFS
Issue Type: Sub-task
Components: hdfs, journal-node, namenode
Reporter: Erik Krogen
Assignee: Erik Krogen
In the interest of making coordinated/consistent reads easier to complete with
low latency, it is advantageous to reduce the time between when a transaction
is applied on the ANN and when it is applied on the SbNN. We propose adding a
new "fast path" which can be used to tail edits when low latency is desired. We
leave the existing tailing logic in place, and fall back to this path on
startup, recovery, and when the fast path encounters unrecoverable errors.
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