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From "Michael Wall (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4428) GC does not delete WAL files belonging to dead tservers
Date Mon, 29 Aug 2016 16:16:20 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15446312#comment-15446312
] 

Michael Wall commented on ACCUMULO-4428:
----------------------------------------

When I merged ACCUMULO-4157 up from 1.7 to 1.8, the code for the GarbageCollectWriteAheadLogs
had changed dramatically and could not reproduce the error in the ticket.  So I never implemented
the firstSeenDead Map<HostAndPort,Long> in the 1.8.0 codebase.  I did however write
a ticket to look at it more in 1.8, https://issues.apache.org/jira/browse/ACCUMULO-4333.

[~elserj] you ok with me moving this ticket back to 1.8.1 and proceeding with the rc for 1.8.0?

> GC does not delete WAL files belonging to dead tservers
> -------------------------------------------------------
>
>                 Key: ACCUMULO-4428
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4428
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.7.2
>            Reporter: Adam J Shook
>            Assignee: Michael Wall
>            Priority: Blocker
>             Fix For: 1.7.3, 1.8.0
>
>
> The GarbageCollectWriteAheadLogs uses a Map<HostAndPort,Long> to track when it
had first seen a dead tserver, waiting an hour before deleting the files.  However, a new
instance of this class is re-created during each run of the SimpleGarbageCollector, causing
the state of the dead tservers to be lost.  All of the WAL files belonging to a dead tserver
will never be removed.



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