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Date: Thu, 16 Jul 2009 17:07:14 -0700 (PDT)
From: "stack (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Updated: (HBASE-1609) [part of hbase-1583] We wait on leases
 to expire before regionserver goes down.  Rather, just let client fail
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     [ https://issues.apache.org/jira/browse/HBASE-1609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-1609:
-------------------------

    Attachment: 1609-v2.patch

This patch cancels leases when next is called and we're going down.

It also just closes all leases in HRS before we run close of all regions.

I don't see why we have to pussy-foot around with Scanners.  They are reading.   If they get exception in middle of reading, then no big deal.   It looks like Scanners will get UnknownScannerException if cluster is shutting down on them.  I added javadoc saying this could be one of the reasons for an USE.

> [part of hbase-1583] We wait on leases to expire before regionserver goes down.  Rather, just let client fail
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1609
>                 URL: https://issues.apache.org/jira/browse/HBASE-1609
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>             Fix For: 0.20.0
>
>         Attachments: 1609-v2.patch, 1609.patch
>
>
> Addressing this issue will help hbase-1583.  We should do for 0.20.0 and perhaps for 0.19.x even.
> Currently, if outstanding leases, in HRegion close, we'll hang until lease expires.  Could be a minute.  Could be worse, the client might come in and renew the lease a few times at least till it finishes out the region.  This gets in way of regionserver shutting down fast.  
> J-D suggests that regionserver should just go down and outstanding clients should fail rather than try and be nice to outstanding clients (in his case, his MR job had failed so no clients... but we insist on lease expiring).

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