[
https://issues.apache.org/jira/browse/RATIS-203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Lokesh Jain updated RATIS-203:
------------------------------
Attachment: RATIS-203.002.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, RATIS-203.002.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}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
