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https://issues.apache.org/jira/browse/RATIS-571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16854231#comment-16854231
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Tsz Wo Nicholas Sze commented on RATIS-571:
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> ... Therefore the serverId for a request is always equal to leaderId. The
> precondition does not add any value.
Isn't the bug in this JIRA is say that the serverId may be different? If yes,
the precondition is to make sure that this JIRA is fixing the bug.
> Client may send first request in sliding window with firstFlag as false
> -----------------------------------------------------------------------
>
> Key: RATIS-571
> URL: https://issues.apache.org/jira/browse/RATIS-571
> Project: Ratis
> Issue Type: Bug
> Components: client
> Reporter: Lokesh Jain
> Assignee: Lokesh Jain
> Priority: Major
> Attachments: RATIS-571.001.patch, RATIS-571.002.patch,
> RATIS-571.003.patch
>
>
> It is possible for the client to send first request in sliding window with
> firstFlag as false.
> In the below example, request with sequence number 73 is accepted in the
> sliding window when the first request is 70. Therefore its first flag is
> false. After that the request with sequence 72 gets a reply from the stream
> observer dc40cfe3. When request 73 is sent to stream observer 87103303 the
> first flag as false and is therefore never processed in the new stream
> observer. It leads to all requests in the server sliding window to be blocked.
>
> {code:java}
> 2019-05-26 11:07:50,532 INFO util.SlidingWindow
> (SlidingWindow.java:sendOrDelayRequest(243)) -
> uid=4272f0d0-95e7-461a-9201-82ddfb218847 request seqNum=73 requestsFirst=70
> firstSeqNum=-1 request=RaftClien
> tRequest:client-DBC1276EA2C1->s0@group-6920A8550E5D, cid=952, seq=73, RW, 3-72
> 2019-05-26 11:07:50,622 INFO util.SlidingWindow
> (SlidingWindow.java:sendRepliesFromHead(439)) -
> dc40cfe3-a06a-43db-893e-e86b0cd41a8b server send reply seq=72
> request=RaftClientRequest:client-DBC1276EA2C1
> ->s1@group-6920A8550E5D, cid=938, seq=72*, RW,
> Message:332d3731:RaftClientReply:client-DBC1276EA2C1->s1@group-6920A8550E5D,
> cid=938, SUCCESS, logIndex=842, commits[s1:c914, s0:c914, s2:c717]
> 2019-05-26 11:07:50,628 DEBUG client.RaftClient
> (RaftClientImpl.java:sendRequestAsync(364)) - client-DBC1276EA2C1: send*
> RaftClientRequest:client-DBC1276EA2C1->s2@group-6920A8550E5D, cid=952,
> seq=73, RW, 3-72
> 2019-05-26 11:07:50,633 INFO util.SlidingWindow
> (SlidingWindow.java:receivedRequest(398)) -
> uid=87103303-ba73-45bf-b2ee-e6c8debf7a25 server received
> request=RaftClientRequest:client-DBC1276EA2C1->s2@group-6920A8550E5D,
> cid=952, seq=73, RW, Message:332d3732:null 13-OrderedRequestStreamObserver13:
> got seq=73 in 13-OrderedRequestStreamObserver13: requests[], nextToProcess=-1
> {code}
>
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