[jira] [Updated] (RATIS-203) RaftClient request may wait indefinitely for a reply

["Lokesh Jain (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/RATIS-203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lokesh Jain updated RATIS-203:
------------------------------
    Attachment: RATIS-203.001.patch

> RaftClient request may wait indefinitely for a reply
> ----------------------------------------------------
>
>                 Key: RATIS-203
>                 URL: https://issues.apache.org/jira/browse/RATIS-203
>             Project: Ratis
>          Issue Type: Bug
>            Reporter: Lokesh Jain
>            Assignee: Lokesh Jain
>            Priority: Major
>         Attachments: RATIS-203.001.patch
>
>
> There are two scenarios which can lead to such a situation.
>  # Raft leader accepts an entry and puts it in its retry cache. But it fails or changes before it can append the entries to its follower. In such a case the entry would remain in its retry cache. If this leader is chosen again by the ring, any subsequent request by the raft client would wait indefinitely for the future in retry cache entry to complete.
>  # The leader receives the request but dies before replying to it.
> Below are the log entries corresponding to first scenario.
> {code:java}
> 2018-01-25 16:28:55,479 DEBUG impl.RaftServerImpl (LeaderState.java:addPendingRequest(239)) - s2: addPendingRequest at index=3255, request=RaftClientRequest(client-C496AD50C41A->s2) in group-8A72B1078A40, cid=3554, seq=293 RW, 322d323933
> 2018-01-25 16:28:57,457 DEBUG impl.RaftServerImpl (RaftServerImpl.java:submitClientRequestAsync(476)) - s2: receive client request(RaftClientRequest(client-C496AD50C41A->s2) in group-8A72B1078A40, cid=3554, seq=293 RW, 322d323933) future client-C496AD50C41A:3554:pending passedjava.util.concurrent.CompletableFuture@404d76c7[Not completed]
> {code}



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