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HBASE-22700 (addendum): Clarify ZK session timeout doc #1748

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May 27, 2020
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HBASE-22700 (addendum): Clarify ZK session timeout doc #1748

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6 changes: 5 additions & 1 deletion src/main/asciidoc/_chapters/schema_design.adoc
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Expand Up @@ -1142,7 +1142,11 @@ Disable Nagle’s algorithm. Delayed ACKs can add up to ~200ms to RPC round trip
Detect regionserver failure as fast as reasonable. Set the following parameters:

* In `hbase-site.xml`, set `zookeeper.session.timeout` to 30 seconds or less to bound failure detection (20-30 seconds is a good start).
- Notice: the `sessionTimeout` of zookeeper is limited between 2 times and 20 times the `tickTime`(the basic time unit in milliseconds used by ZooKeeper.the default value is 2000ms.It is used to do heartbeats and the minimum session timeout will be twice the tickTime).
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- Note: Zookeeper clients negotiate a session timeout with the server during client init. Server enforces this timeout to be in the
range [`minSessionTimeout`, `maxSessionTimeout`] and both these timeouts (measured in milliseconds) are configurable in Zookeeper service configuration.
If not configured, these default to 2 * `tickTime` and 20 * `tickTime` respectively (`tickTime` is the basic time unit used by ZooKeeper,
as measured in milliseconds. It is used to regulate heartbeats, timeouts etc.). Refer to Zookeeper documentation for additional details.

* Detect and avoid unhealthy or failed HDFS DataNodes: in `hdfs-site.xml` and `hbase-site.xml`, set the following parameters:
- `dfs.namenode.avoid.read.stale.datanode = true`
- `dfs.namenode.avoid.write.stale.datanode = true`
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