Tian Jiang created IOTDB-1118:
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Summary: [Distributed] Limit query log lag in mid consistency level
Key: IOTDB-1118
URL: https://issues.apache.org/jira/browse/IOTDB-1118
Project: Apache IoTDB
Issue Type: Improvement
Components: Cluster
Reporter: Tian Jiang
We provide a middle level of read consistency, which is a best-effort strategy,
and will try to synchronize with the leader and uses the local data when the
synchronization times out. However, the maximum log lag is undefined, which
means the node can be arbitrarily far from the leader (missing arbitrarily
length of logs) and incurs inconvenience when the user wants to control the
data freshness.
To resolve this, a configuration should be provided like `max_read_log_lag`,
which only takes effect when the consistency level is set to mid, and queries
will fail if the log lag exceeds this configuration after a time out.
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