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From Øystein Grøvlen (JIRA) <j...@apache.org>
Subject [jira] Updated: (DERBY-3071) Replication: Modify logging subsystem for slave replication mode
Date Thu, 25 Oct 2007 12:51:50 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Øystein Grøvlen updated DERBY-3071:
-----------------------------------

    Derby Info:   (was: [Patch Available])

Thanks for the update, Jørgen.
Committed patch, derby-3071_continuous-recovery_1c.diff, as revision 588210.

With respect to 1d), I would think it would be less confusing if the assignment was put inside
the if block where it is needed. You may consider that for future follow-up patches.  Actually,
I am not sure the assignment is needed since it seems to me that when (logEnd == LogCounter.INVALID_LOG_INSTANT),
logFileNumber will not have changed since boot.

> Replication: Modify logging subsystem for slave replication mode
> ----------------------------------------------------------------
>
>                 Key: DERBY-3071
>                 URL: https://issues.apache.org/jira/browse/DERBY-3071
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Services, Store
>            Reporter: Jørgen Løland
>            Assignee: Jørgen Løland
>         Attachments: derby-3071_continuous-recovery_1a.diff, derby-3071_continuous-recovery_1a.stat,
derby-3071_continuous-recovery_1b.diff, derby-3071_continuous-recovery_1c.diff
>
>
> When a database is booted in slave replication mode, it should apply log records received
from the master but must not generate log by itself. As described in the functional specification
(see DERBY-2872), a database booted in slave mode should enter LogToFile#recover, but not
leave this method until the database is no longer in slave mode. 
> The current plan for this issue is to modify LogToFile the following ways:
> * LogToFile is put in slave mode automatically during boot (if property SlaveFactory.SLAVE_MODE
is set, see DERBY-3021), but a method is needed to take LogToFile out of recovery mode.
> * SlaveFactory (DERBY-3021) will receive log records from the master and use LogToFile#appendLogRecord
to write these to disk. While in slave mode, only SlaveFactory will be allowed to append log
records.
> * The thread running LogToFile#recover will recover (redo) one log file at a time (like
now), but will not be allowed to open a log file X until that file is no longer being written
to. Thus, while appenLogFile writes to logX.dat, recover will be allowed to read all log files
up to and including logX-1.dat but will then have to wait until appendLogRecord starts writing
to logX+1.dat.
> All the described changes will only apply when in slave mode

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