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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11094) Distributed log replay is incompatible for rolling restarts
Date Tue, 29 Apr 2014 01:49:16 GMT
Enis Soztutar created HBASE-11094:
-------------------------------------

             Summary: Distributed log replay is incompatible for rolling restarts
                 Key: HBASE-11094
                 URL: https://issues.apache.org/jira/browse/HBASE-11094
             Project: HBase
          Issue Type: Sub-task
            Reporter: Enis Soztutar
            Assignee: Jeffrey Zhong
            Priority: Blocker
             Fix For: 0.99.0


0.99.0 comes with dist log replay by default (HBASE-10888). However, reading the code and
discussing this with Jeffrey, we realized that the dist log replay code is not compatible
with rolling upgrades from 0.98.0 and 1.0.0.

The issue is that, the region server looks at it own configuration to decide whether the region
should be opened in replay mode or not. The open region RPC does not contain that info. So
if dist log replay is enabled on master, the master will assign the region and schedule replay
tasks. If the region is opened in a RS that does not have this conf enabled, then it will
happily open the region in normal mode (not replay mode) causing possible (transient) data
loss. 





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