[ 
https://issues.apache.org/jira/browse/IGNITE-13016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Vladimir Steshin updated IGNITE-13016:
--------------------------------------
    Attachment:     (was: FailureDetectionResearch.patch)

> Fix backward checking of failed node.
> -------------------------------------
>
>                 Key: IGNITE-13016
>                 URL: https://issues.apache.org/jira/browse/IGNITE-13016
>             Project: Ignite
>          Issue Type: Sub-task
>            Reporter: Vladimir Steshin
>            Assignee: Vladimir Steshin
>            Priority: Major
>              Labels: iep-45
>         Attachments: WostCaseStepByStep.txt
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> We should fix several drawbacks in the backward checking of failed node. They 
> prolong node failure detection upto: 
> ServerImpl.CON_CHECK_INTERVAL + 2 * 
> IgniteConfiguretion.failureDetectionTimeout + 300ms. 
> See:
> * ‘_NodeFailureResearch.patch_'. It creates test 'FailureDetectionResearch' 
> which emulates long answears on a failed node and measures failure detection 
> delays.
> * '_FailureDetectionResearch.txt_' - results of the test.
> * '_FailureDetectionResearch_fixed.txt_' - results of the test after this fix.
> * '_WostCaseStepByStep.txt_' - description how the worst case happens.
> *Suggestions:*
> 1) We should replace hardcoded timeout 100ms with a parameter like 
> failureDetectionTimeout:
> {code:java}
> private boolean ServerImpl.isConnectionRefused(SocketAddress addr) {
>    ...
>     sock.connect(addr, 100); // Make it rely on failureDetectionTimeout.
>    ...
> }
> {code}
> 2) Any negative result of the connection checking should be considered as 
> node failed. Currently, we look only at refused connection. Any other 
> exceptions, including a timeout, are treated as living connection: 
> {code:java}
> private boolean ServerImpl.isConnectionRefused(SocketAddress addr) {
>    ...
>    catch (ConnectException e) {
>       return true;
>    }
>    catch (IOException e) {
>       return false; // Make any error mean lost connection.
>    }
>    return false;
> }
> {code}
> 3) Maximal interval to check previous node should rely on actual failure 
> detection timeout:
> {code:java}
>    TcpDiscoveryHandshakeResponse res = new TcpDiscoveryHandshakeResponse(...);
>    ...
>    // We got message from previous in less than double connection check 
> interval.
>    boolean ok = rcvdTime + CON_CHECK_INTERVAL * 2 >= now; // Here should be a 
> timeout of failure detection.
>    if (ok) {
>       // Check case when previous node suddenly died. This will speed up
>       // node failing.
>       ...
>     }
>     res.previousNodeAlive(ok);
> {code}



--
This message was sent by Atlassian Jira
(v8.3.4#803005)

Reply via email to