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From "Alexey Goncharuk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-6285) Enhance persistent store paths logging on start
Date Tue, 19 Sep 2017 13:55:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-6285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16171729#comment-16171729

Alexey Goncharuk commented on IGNITE-6285:

There are several scenarios when generating random IDs does not work predictably, specifically,
when a user starts multiple node instances on the same physical machine. 

I suggest the following (assuming we maintain the backwards compatibility)
1) A starting node binds to a port and generates old-style consistent ID
2) The node scans the work directory and checks if there is a folder matching the consistent
ID. If such a folder exists, we start up with this ID (compatibility mode)
3) If there are no matching folders, but the directory is not empty, scan it for old-style
consistent IDs. If there are old-style db folders, print out a warning (or fail to start)
4) If there are existing new style folders, pick up the one with the smallest sequence number
and try to lock the directory. Repeat until we succeed or until the list of new-style consistent
IDs is empty
5) If there are no more available new-style folders, generate a new one with next sequence
number and random UUID as consistent ID.
6) Use this consistent ID for the node startup

As Yakov suggested, we can update the lock file on every use and print out this timestamp
during the node startup.

[~dmagda] [~yzhdanov] [~dsetrakyan] please let me know what you think.

> Enhance persistent store paths logging on start
> -----------------------------------------------
>                 Key: IGNITE-6285
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6285
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Yakov Zhdanov
>            Assignee: Alexey Goncharuk
>            Priority: Blocker
>              Labels: usability
>             Fix For: 2.3
> As per this thread - http://apache-ignite-users.70518.x6.nabble.com/Specifying-location-of-persistent-storage-location-td16636i20.html
> Ignite may switch storage path in case of changing DHCP lease or similar which can lead
to consistent ID change.
> In order to help user in spotting the issue Ignite may output the following to the logs:
> # Output the store path and tell its (1) size or state that it is empty and (2) last
data file modification date.
> # Output warning if there are other non-empty storage folders under work directory with
their sizes and dates.

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