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YARN-3805. Update the documentation of Disk Checker based on YARN-90. Contributed by Masatake Iwasaki. 

(cherry picked from commit 1ba2986dee)
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Tsuyoshi Ozawa 2015-07-16 17:52:38 +09:00
parent 90c5bf0605
commit e97a14ae6f
2 changed files with 9 additions and 2 deletions
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3
hadoop-yarn-project/CHANGES.txt
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@ -586,6 +586,9 @@ Release 2.8.0 - UNRELEASED
YARN-3174. Consolidate the NodeManager and NodeManagerRestart documentation
into one. (Masatake Iwasaki via ozawa)
YARN-3805. Update the documentation of Disk Checker based on YARN-90.
(Masatake Iwasaki via ozawa)
Release 2.7.2 - UNRELEASED
INCOMPATIBLE CHANGES

8
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManager.md
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@ -36,7 +36,9 @@ The NodeManager runs services to determine the health of the node it is executin
###Disk Checker
The disk checker checks the state of the disks that the NodeManager is configured to use(local-dirs and log-dirs, configured using yarn.nodemanager.local-dirs and yarn.nodemanager.log-dirs respectively). The checks include permissions and free disk space. It also checks that the filesystem isn't in a read-only state. The checks are run at 2 minute intervals by default but can be configured to run as often as the user desires. If a disk fails the check, the NodeManager stops using that particular disk but still reports the node status as healthy. However if a number of disks fail the check(the number can be configured, as explained below), then the node is reported as unhealthy to the ResourceManager and new containers will not be assigned to the node. In addition, once a disk is marked as unhealthy, the NodeManager stops checking it to see if it has recovered(e.g. disk became full and was then cleaned up). The only way for the NodeManager to use that disk to restart the software on the node. The following configuration parameters can be used to modify the disk checks:
The disk checker checks the state of the disks that the NodeManager is configured to use(local-dirs and log-dirs, configured using yarn.nodemanager.local-dirs and yarn.nodemanager.log-dirs respectively). The checks include permissions and free disk space. It also checks that the filesystem isn't in a read-only state. The checks are run at 2 minute intervals by default but can be configured to run as often as the user desires. If a disk fails the check, the NodeManager stops using that particular disk but still reports the node status as healthy. However if a number of disks fail the check(the number can be configured, as explained below), then the node is reported as unhealthy to the ResourceManager and new containers will not be assigned to the node.
The following configuration parameters can be used to modify the disk checks:
| Configuration Name | Allowed Values | Description |
|:---- |:---- |:---- |
@ -48,7 +50,9 @@ The NodeManager runs services to determine the health of the node it is executin
###External Health Script
Users may specify their own health checker script that will be invoked by the health checker service. Users may specify a timeout as well as options to be passed to the script. If the script exits with a non-zero exit code, times out or results in an exception being thrown, the node is marked as unhealthy. Please note that if the script cannot be executed due to permissions or an incorrect path, etc, then it counts as a failure and the node will be reported as unhealthy. Please note that speifying a health check script is not mandatory. If no script is specified, only the disk checker status will be used to determine the health of the node. The following configuration parameters can be used to set the health script:
Users may specify their own health checker script that will be invoked by the health checker service. Users may specify a timeout as well as options to be passed to the script. If the script exits with a non-zero exit code, times out or results in an exception being thrown, the node is marked as unhealthy. Please note that if the script cannot be executed due to permissions or an incorrect path, etc, then it counts as a failure and the node will be reported as unhealthy. Please note that speifying a health check script is not mandatory. If no script is specified, only the disk checker status will be used to determine the health of the node.
The following configuration parameters can be used to set the health script:
| Configuration Name | Allowed Values | Description |
|:---- |:---- |:---- |