Andrew Wong created KUDU-3055:
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Summary: Lazily open cold tablets
Key: KUDU-3055
URL: https://issues.apache.org/jira/browse/KUDU-3055
Project: Kudu
Issue Type: New Feature
Components: master, tablet, tserver
Reporter: Andrew Wong
It might be useful in larger deployments to have the ability to lazily
bootstrap cold tablets.
Currently, WAL replay consumes a significant amount of bootstrapping time. If
we know certain tablets are read infrequently, we ought to be able to indicate
that we only want to bootstrap and replay the WALs for tablets that have been
accessed recently.
[This patch|https://github.com/apache/kudu/commit/ca957fb] gave us a metric for
hotness and coldness at the replica level -- we might want to consider
aggregating this on the master to determine what partitions are hot and cold,
and have the master signal to the appropriate tablet servers upon registering
that certain replicas should be bootstrapped. We might also consider
bootstrapping when a client first calls {{OpenTable()}}.
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