Lokesh Jain created RATIS-571:
---------------------------------
Summary: 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
Reporter: Lokesh Jain
Assignee: Lokesh Jain
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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