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https://issues.apache.org/jira/browse/HDFS-17285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan resolved HDFS-17285.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Target Version/s: 3.4.0
Assignee: liuguanghua
Resolution: Fixed
> RBF: Add a safe mode check period configuration
> -----------------------------------------------
>
> Key: HDFS-17285
> URL: https://issues.apache.org/jira/browse/HDFS-17285
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: liuguanghua
> Assignee: liuguanghua
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> When dfsrouter start, it enters safe mode. And it will cost 1min to leave.
> The log is blow:
> 14:35:23,717 INFO
> org.apache.hadoop.hdfs.server.federation.router.RouterSafemodeService: Leave
> startup safe mode after 30000 ms
> 14:35:23,717 INFO
> org.apache.hadoop.hdfs.server.federation.router.RouterSafemodeService: Enter
> safe mode after 180000 ms without reaching the State Store
> 14:35:23,717 INFO
> org.apache.hadoop.hdfs.server.federation.router.RouterSafemodeService:
> Entering safe mode
> 14:35:24,996 INFO
> org.apache.hadoop.hdfs.server.federation.router.RouterSafemodeService:
> Delaying safemode exit for 28721 milliseconds...
> 14:36:25,037 INFO
> org.apache.hadoop.hdfs.server.federation.router.RouterSafemodeService:
> Leaving safe mode after 61319 milliseconds
> It depends on these configs.
> DFS_ROUTER_SAFEMODE_EXTENSION 30s
> DFS_ROUTER_SAFEMODE_EXPIRATION 3min
> DFS_ROUTER_CACHE_TIME_TO_LIVE_MS 1min (it is the period for check safe mode)
> Because in safe mode dfsrouter will reject write requests, so it should be
> shorter in check period if refreshCaches is done. And we should remove
> DFS_ROUTER_CACHE_TIME_TO_LIVE_MS form RouterSafemodeService.
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