[infinispan-issues] [JBoss JIRA] (ISPN-5740) HotRod client write buffer is too large

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-5740:
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             Summary: HotRod client write buffer is too large
                 Key: ISPN-5740
                 URL: https://issues.jboss.org/browse/ISPN-5740
             Project: Infinispan
          Issue Type: Bug
          Components: Server
    Affects Versions: 8.0.0.Final
            Reporter: Dan Berindei
            Assignee: Dan Berindei
             Fix For: 8.1.0.Alpha1


The ISPN-1015 fix added a buffer to the HotRod client transport to reduce the number of syscalls. But that buffer's size is not fixed, instead it's based on {{Socket.getSendBufferSize()}}, which in turn is based on the kernel's {{net.core.wmem_max}}.

JGroups needs {{net.core.wmem_max}} greater or equal than {{UDP.ucast_send_buf_size}}, which is 1MB by default. That is probably too much for the {{TcpTransport}}'s buffer, because the buffer is also duplicated in the OS.




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