STORM-3240 update health check documentation with behavior change
Project: http://git-wip-us.apache.org/repos/asf/storm/repo Commit: http://git-wip-us.apache.org/repos/asf/storm/commit/7811fd02 Tree: http://git-wip-us.apache.org/repos/asf/storm/tree/7811fd02 Diff: http://git-wip-us.apache.org/repos/asf/storm/diff/7811fd02 Branch: refs/heads/master Commit: 7811fd02c5880067593a809024893268ea629db4 Parents: 39d2838 Author: Aaron Gresch <agre...@yahoo-inc.com> Authored: Tue Oct 2 14:00:52 2018 -0500 Committer: Aaron Gresch <agre...@yahoo-inc.com> Committed: Tue Oct 2 14:00:52 2018 -0500 ---------------------------------------------------------------------- docs/Setting-up-a-Storm-cluster.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/storm/blob/7811fd02/docs/Setting-up-a-Storm-cluster.md ---------------------------------------------------------------------- diff --git a/docs/Setting-up-a-Storm-cluster.md b/docs/Setting-up-a-Storm-cluster.md index 67ad727..c4a637c 100644 --- a/docs/Setting-up-a-Storm-cluster.md +++ b/docs/Setting-up-a-Storm-cluster.md @@ -92,7 +92,7 @@ drpc.servers: ["111.222.333.44"] ### Monitoring Health of Supervisors -Storm provides a mechanism by which administrators can configure the supervisor to run administrator supplied scripts periodically to determine if a node is healthy or not. Administrators can have the supervisor determine if the node is in a healthy state by performing any checks of their choice in scripts located in storm.health.check.dir. If a script detects the node to be in an unhealthy state, it must print a line to standard output beginning with the string ERROR. The supervisor will periodically run the scripts in the health check dir and check the output. If the scriptâs output contains the string ERROR, as described above, the supervisor will shut down any workers and exit. +Storm provides a mechanism by which administrators can configure the supervisor to run administrator supplied scripts periodically to determine if a node is healthy or not. Administrators can have the supervisor determine if the node is in a healthy state by performing any checks of their choice in scripts located in storm.health.check.dir. If a script detects the node to be in an unhealthy state, it must print a line to standard output beginning with the string ERROR and return a non-zero exit code. In pre-Storm 2.x releases, a bug considered a script exit value of 0 to be a failure. This has now been fixed. The supervisor will periodically run the scripts in the health check dir and check the output. If the scriptâs output contains the string ERROR, as described above, the supervisor will shut down any workers and exit. If the supervisor is running with supervision "/bin/storm node-health-check" can be called to determine if the supervisor should be launched or if the node is unhealthy.
