[jira] Commented: (HADOOP-1937) [hbase] when the master times out a region server's lease, it is too aggressive in reclaiming the server's log

["Jim Kellerman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-1937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529977 ] 

Jim Kellerman commented on HADOOP-1937:
---------------------------------------

Implementation strategy:

When a server's lease expires, remove the server from serversToServerInfo, put the serverInfo into a new Map, serversInJeopardy and put a PendingServerShutdown into a DelayQueue with an expiration of 1/2 of a server lease timeout.

If the server reports in in that period, the PendingServerShutdown is removed from the DelayQueue and the server is "reinstated" by removing it from the serversInJeopardy Map and putting it back in the serversToServerInfo map.

If the server does not report in, it is removed from the serversInJeopardy Map and the PendingServerShutdown is processed.

> [hbase] when the master times out a region server's lease, it is too aggressive in reclaiming the server's log
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1937
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1937
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.15.0
>            Reporter: Jim Kellerman
>            Assignee: Jim Kellerman
>             Fix For: 0.15.0
>
>
> When a region server's lease times out, the master immediately begins trying to split the server's log file. There have been cases where a region server was just a little late reporting to the master and the master had already started trying to reclaim the server's log, even though the server was still writing to it. 
> There needs to be some kind of "grace period" in which, if the region server reports in, the master re-instates the server. If the "grace period" expires, then the master should start processing the server's log.

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