JGroups Protocol GMS: Difference between revisions
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2016-02-29 09:25:24,125 [TRACE] [org.jgroups.protocols.TCP] (ViewHandler,TEST-CLUSTER,host01/tcp) -- null: sending msg to null, src=host01/tcp, headers are GMS: GmsHeader[VIEW], NAKACK2: [MSG, seqno=434687], TCP: [channel_name=TEST-CLUSTER] | 2016-02-29 09:25:24,125 [TRACE] [org.jgroups.protocols.TCP] (ViewHandler,TEST-CLUSTER,host01/tcp) -- null: sending msg to null, src=host01/tcp, headers are GMS: GmsHeader[VIEW], NAKACK2: [MSG, seqno=434687], TCP: [channel_name=TEST-CLUSTER] | ||
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The new view is installed at the GMS level - including for the coordinator that originated it - only when the multicast message returns to the GMS protocol: | |||
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2016-02-29 09:25:24,157 [TRACE] [org.jgroups.protocols.pbcast.GMS] (Cluster Dispatch) -- host01/tcp: received delta view [host01/tcp|3], ref-view=[host01/tcp|2], left=[host02/tcp] | |||
2016-02-29 09:25:24,157 [DEBUG] [org.jgroups.protocols.pbcast.GMS] (Cluster Dispatch) -- host01/tcp: installing view [host01/tcp|3] (2) [host01/tcp, host03/tcp] | |||
</pre> | </pre> | ||
Revision as of 03:47, 3 March 2016
Internal
Suspected Member Exclusion
If a SUSPECT message survives VERIFY_SUSPECT verification, it is passed up the stack and reaches the GMS layer, which computes and multicasts a new view. The new view does not contain the suspect member:
2016-02-29 09:25:24,110 [TRACE] [org.jgroups.protocols.pbcast.GMS] (ViewHandler,TEST-CLUSTER,host01/tcp) -- host01/tcp: joiners=[], suspected=[host02/tcp], leaving=[], new view: [host01/tcp|3] (2) [host01/tcp, host03/tcp] 2016-02-29 09:25:24,110 [TRACE] [org.jgroups.protocols.pbcast.GMS] (ViewHandler,TEST-CLUSTER,host01/tcp) -- host01/tcp: mcasting view [host01/tcp|3] (2) [host01/tcp, host03/tcp] (2 mbrs)
The log sequence above shows how "host02" is removed from the [host01, host02, host03] view.
This is how the VIEW message looks at the transport level:
2016-02-29 09:25:24,125 [TRACE] [org.jgroups.protocols.TCP] (ViewHandler,TEST-CLUSTER,host01/tcp) -- null: sending msg to null, src=host01/tcp, headers are GMS: GmsHeader[VIEW], NAKACK2: [MSG, seqno=434687], TCP: [channel_name=TEST-CLUSTER]
The new view is installed at the GMS level - including for the coordinator that originated it - only when the multicast message returns to the GMS protocol:
2016-02-29 09:25:24,157 [TRACE] [org.jgroups.protocols.pbcast.GMS] (Cluster Dispatch) -- host01/tcp: received delta view [host01/tcp|3], ref-view=[host01/tcp|2], left=[host02/tcp] 2016-02-29 09:25:24,157 [DEBUG] [org.jgroups.protocols.pbcast.GMS] (Cluster Dispatch) -- host01/tcp: installing view [host01/tcp|3] (2) [host01/tcp, host03/tcp]