Tian Jiang created IOTDB-915:
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Summary: [Distributed] Merge StableEntryManager into
CommittedLogManager
Key: IOTDB-915
URL: https://issues.apache.org/jira/browse/IOTDB-915
Project: Apache IoTDB
Issue Type: Improvement
Components: Core/Cluster
Reporter: Tian Jiang
The current version of CommittedLogManager only holds a small number of logs,
as it only uses the persistent storage (namely the StableEntryManager) as a
measure of recovery, not to extend its storage ability. The result is that when
one follower is down, its difference from the leader will soon exceed the
capability of the CommittedLogManager, which further results in a snapshot
catch-up, and it is time-consuming.
The idea is to merge StableEntryManager into CommittedLogManager, all committed
logs should go to the persistent storage (unless persistency is disabled), and
only the newest part of the logs will stay in memory. And CommittedLogManager
should be able to read logs from the disk for catch-ups, provided they are not
physically removed. Thus, the retention policy of memory logs and disk logs
should be reconsidered.
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