[jira] [Work started] (TS-4744) ParentConsistentHash::selectParent may select the unavailable parent

["John Rushford (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-4744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on TS-4744 started by John Rushford.
-----------------------------------------
> ParentConsistentHash::selectParent may select the unavailable parent
> --------------------------------------------------------------------
>
>                 Key: TS-4744
>                 URL: https://issues.apache.org/jira/browse/TS-4744
>             Project: Traffic Server
>          Issue Type: Bug
>            Reporter: xiangdong chen
>            Assignee: John Rushford
>
> code :ParentConsistentHash.cc,begin at line 141  
> do { // search until we've selected a different parent.
>         prtmp = (pRecord *)fhash->lookup(NULL, &result->chashIter[last_lookup], &wrap_around[last_lookup], &hash);
>         if (prtmp) {
>           pRec = (parents[last_lookup] + prtmp->idx);
>         }
>       } while (prtmp && strcmp(prtmp->hostname, result->hostname) == 0);
> fix it like this:
>         if (prtmp)
>           pRec = (parents[last_lookup] + prtmp->idx);
>         else  //begin of added xdchen, line:143
>           pRec = NULL; //endof of added by xdchen  
>  if (prtmp) {
>           pRec = (parents[last_lookup] + prtmp->idx);
>           Debug("parent_select", "Selected a new parent: %s.", pRec->hostname);
>         }
>         else  //begin of added xdchen, line:188
>           pRec = NULL; ////end of added xdchen
>  
>       }



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