Hi Igniters, We often see similar questions from users and customers related to IgniteConfiguration, TcpDiscoverySpi, TcpCommunicationSpi timeouts and their relations. And we see several side-effects after incorrect timeout configuration.
I tried to briefly describe these timeout settings (please see below) and found out that the most of them do not have sense in terms of cluster functions/operations and could not be explained to the users. I propose to deprecate most of them and leave only the timeouts we can explain in common terms ( (setFailureDetectionTimeout, setNetworkTimeout, setJoinTimeout and some others). Please let me know your thoughts. Thanks, Alexey GLOBAL: IgniteConfiguration.setNetworkTimeout: It is a global timeout for high-level operations where a network is involved. For instance, IgniteMessaging delivery uses this timeout or DiscoverySpi handshake. IgniteConfiguration.setFailureDetectionTimeout: It is a global timeout for detecting failures at IgniteSpi implementations (including DiscoverySpi and CommunicationSpi). The failure detection algorithm actually limits a range of simple network operations related to a single logical operation (for instance, a reliable delivery of some DiscoverySpi message within a cluster). Failure detection timeout is a cumulative timeout for a socket connection, sending and receiving data bytes and all possible socket retries (if some failure happens). This timeout is intended to simplify the failure detection condition from a user perspective. IgniteConfiguration.setClientFailureDetectionTimeout: - it is a special case for DiscoverySpi client-node Ignite. TCP DISCOVERY SPI: If you need more control over failure detection algorithm for TcpDiscoverySpi you can explicitly use the following low-level options (that will disable failureDetectoinTimeout logic): 1. TcpDiscoverySpi.setConnectTimeout - socket connection timeout 2. TcpDiscoverySpi.setReconnectCount - number of reconnect attempts used when establishing connection with the remote node and sending messages to it 3. TcpDiscoverySpi.setSocketTimeout - socket write timeout. The write operation will be repeated getReconnectCount() times if it exceeds this timeout 4. TcpDiscoverySpi.setAckTimeout - message acknowledgment timeout. If a message acknowledgment is not received within this timeout, sending is considered as failed and SPI will try to repeat send operation. It is automatically doubled for simultaneous retries up to getMaxAckTimeout value. 5. TcpDiscoverySpi.setMaxAckTimeout - maximum connection timeout, if the getAckTimeout reaches getMaxAckTimeout then SPI give up sending retries Another important TcpDiscoverySpi timeouts: TcpDiscoverySpi.setJoinTimeout - It is a timeout for join process when a new/restarted node joins a cluster. The node tries to connect to all available IP addresses provided by ipFinder within this timeout. If the timeout is exceeded, the node will give up and throw an exception from Ignition.start(). TcpDiscoverySpi.setNetworkTimeout - timeout for high-level operations like handshake. It looks like it should be deprecated and the IgniteConfiguration.getNetworkTimeout should be used here. TCP COMMUNICATION SPI: If you need more control over failure detection algorithm for TcpCommunicationSpi you can explicitly use the following low-level options (that will disable failureDetectoinTimeout logic): 1. TcpCommunicationSpi.setConnectTimeout - socket connection timeout, will be automatically doubled for simultaneous retries (up to getReconnectCount) related to a single logical operation 2. TcpCommunicationSpi.setMaxConnectTimeout - maximum connection timeout, the higher limit of getReconnectCount-times doubled getConnectTimeout 3. TcpCommunicationSpi.setReconnectCount - number of reconnect attempts used when establishing connection with the remote node and sending messages to it Another important TcpCommunicationSpi timeouts: TcpDiscoverySpi.setSocketWriteTimeout - timeout to send a message. TcpDiscoverySpi.setIdleConnectionTimeout - maximum idle connection timeout upon which a connection will be closed. -- Sent from: http://apache-ignite-developers.2346864.n4.nabble.com/
