Small cleanups
Small cleanups
Refactoring argnames & order for more consistency
Add server-side-calculated MD5 checksum + logging
file:consult() style checksum management, too slow! 513K csums = 105 seconds, ouch
Much faster checksum recording
Add checksum_list. Alas, line-by-line I/O is slow, neh?
Much faster checksum listing
Add file0_verify_checksums.escript and supporting code
Adjust escript +A and -smp flags
Add file0_compare_filelists.escript
First draft of file0_repair_server.escript
First draft of file0_repair_server.escript, part 2
WIP of file0_repair_server.escript, part 3
WIP of file0_repair_server.escript, part 4
Basic repair works, it seems, hooray!
When checksum file ordering is different, try a cheap(?) 'cmp' on sorted results instead
Add README.md
Initial import of szone_chash.erl
Add file0_cc_make_projection.escript and supporting code
Add file0_cc_map_prefix.escript and supporting code
Change think-o: hash output is a chain, silly boy
Add file0_cc_1file_write_redundant.escript and support
Add file0_cc_read_client.escript and supporting code
Add examples/servers.map & file0_start_servers.escript
WIP: working on file0_cc_migrate_files.escript
File migration finished, works, yay!
Add basic 'what am I' docs to each script
Add file0_server_daemon.escript
Minor fixes
Fix broken unit test
Add basho_bench run() commands for append & read ops with projection
Add to examples dir
WIP: erasure coding hack, part 1
Fix broken unit test
WIP: erasure coding hack, part 2
WIP: erasure coding hack, part 3, EC data write is finished!
WIP: erasure coding hack, part 4, EC data read still in progress
WIP: erasure coding hack, part 5, EC data read still in progress
WIP: erasure coding hack, part 5b, EC data read still in progress
WIP: erasure coding hack, EC data read finished!
README update, part 1
README update, part 2
Oops, put back the printed ouput for file-write-client and 1file-write-redundant-client
README update, part 3
Fix 'user' output bug in list-client
Ugly hacks to get output/no-output from write clients
Clean up minor output bugs
Clean up minor output bugs, part 2
README update, part 4
Clean up minor output bugs, part 3
Clean up minor output bugs, part 5
Clean up minor output bugs, part 6
README update, part 6
README update, part 7
README update, part 7
README update, part 8
Final edits/fixes for demo day
Fix another oops in the README/demo day script
So, it definitely works, in that it stops a low(er) ranking flapping
process from continuing to make new proposals, so then the cycle of
flapping stops. Whenever an up/down state changes and a new/different
proposal is made, then things immediately resume, yay.
However, there's still a problem of the chain state at this time,
I believe. Here's a session that's damped by the flap counter:
SET always_last_partitions ON ... we should see convergence to correct chains.
21:23:03.170 d uses: [{epoch,457},{author,a},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,3}}}]}]
21:23:03.270 c uses: [{epoch,457},{author,a},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,3}}}]}]
21:23:03.471 a uses: [{epoch,459},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{repair_airquote_done,{we_agree,457}},{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,3}}}]}]
21:23:03.611 b uses: [{epoch,460},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,3}}}]}]
21:23:03.635 d uses: [{epoch,461},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,3}}}]}]
21:23:03.672 c uses: [{epoch,461},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,3}}}]}]
21:23:03.873 a uses: [{epoch,462},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,3}}}]}]
21:23:04.155 d uses: [{epoch,463},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:04.198 c uses: [{epoch,463},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:04.270 b uses: [{epoch,464},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:04.276 a uses: [{epoch,465},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:04.652 d uses: [{epoch,466},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:04.660 c uses: [{epoch,466},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:04.679 a uses: [{epoch,467},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:04.914 b uses: [{epoch,468},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,4}}}]}]
21:23:05.058 d uses: [{epoch,469},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,5}}}]}]
21:23:05.062 c uses: [{epoch,469},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,5}}}]}]
21:23:05.081 a uses: [{epoch,470},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,5}}}]}]
21:23:05.579 b uses: [{epoch,471},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,5}}}]}]
21:23:05.581 d uses: [{epoch,472},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,5}}}]}]
21:23:05.590 c uses: [{epoch,472},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,5}}}]}]
21:23:05.885 a uses: [{epoch,473},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,5}}}]}]
21:23:06.102 d uses: [{epoch,474},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:06.159 c uses: [{epoch,474},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:06.250 b uses: [{epoch,475},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:06.288 a uses: [{epoch,476},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:06.612 d uses: [{epoch,477},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:06.620 c uses: [{epoch,477},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:06.691 a uses: [{epoch,478},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:06.893 b uses: [{epoch,479},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,6}}}]}]
21:23:07.015 d uses: [{epoch,480},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,7}}}]}]
21:23:07.022 c uses: [{epoch,480},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,7}}}]}]
21:23:07.094 a uses: [{epoch,481},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,7}}}]}]
21:23:07.516 d uses: [{epoch,482},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,7}}}]}]
21:23:07.550 b uses: [{epoch,483},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,7}}}]}]
{FLAP: c flaps 4}!
{FLAP: c flaps 5}!
21:23:07.898 a uses: [{epoch,484},{author,a},{upi,[a,d]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,7}}}]}]
21:23:08.010 d uses: [{epoch,485},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,8}}}]}]
21:23:08.013 c uses: [{epoch,485},{author,d},{upi,[a]},{repair,[b,d,c]},{down,[]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,8}}}]}]
21:23:08.221 b uses: [{epoch,486},{author,b},{upi,[b]},{repair,[c,d]},{down,[a]},{d,[{author_proc,react},{ps,[{a,b}]},{nodes_up,[b,c,d]}]},{d2,[{network_islands,[na_reset_by_always]},{hooray,{v2,{2014,11,8},{21,23,8}}}]}]
{FLAP: a flaps 5}!
{FLAP: a flaps 6}!
SET always_last_partitions OFF ... let loose the dogs of war!
21:23:17.349 b uses: [{epoch,495},{author,b},{upi,[b]},{repair,[c,d,a]},{down,[]},{d,[{author_proc,react},{ps,[]},{nodes_up,[a,b,c,d]}]},{d2,[{network_islands,[islands_not_supported]},{hooray,{v2,{2014,11,8},{21,23,17}}}]}]
So, the state of the chains at 21:23:11.221, three seconds after
the flapping detector finished, is:
epoch=484, UPI=[a,d], repair=[c], nodes_up=[a,c,d]
epoch=485, UPI=[a], repair=[b,d,c], nodes_up=[a,b,c,d]
epoch=486, UPI=[b], repair=[c,d], nodes_up=[b,c,d]
The UPIs are overlapping, derp, that won't work, thanks to the magic
of epoch version # enforcement, However, the clients need to concern
themselves with the repairing members, also. As soon as a client
in the epoch=486 sends an op to FLU c or FLU d, those nodes will
wedge themselves because they're in a different epoch. Everyone
will get stuck, and then life sucks.
Future work TBD!
So, this is an interesting case where an asymmetric network parittion
can cause the current algorithm to cycle for several seconds, then one
participant X becomes less active (I'm not sure why), the other two
participants slowly come to an agreement, then X seems to wake up and
return everyone to the cycle/flapping loop.
SET always_last_partitions ON ... we should see convergence to correct chains.
16:35:03.986 c uses: [{epoch,321},{author,b},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:04.118 b uses: [{epoch,323},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{repair_airquote_done,{we_agree,321}},{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:04.492 c uses: [{epoch,324},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:04.520 b uses: [{epoch,325},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:04.583 a uses: [{epoch,326},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:04.894 c uses: [{epoch,327},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:04.922 b uses: [{epoch,328},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:05.291 a uses: [{epoch,329},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:05.296 c uses: [{epoch,330},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:05.324 b uses: [{epoch,331},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:05.830 c uses: [{epoch,332},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:06.023 a uses: [{epoch,333},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:06.128 b uses: [{epoch,334},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:06.342 c uses: [{epoch,335},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:06.530 b uses: [{epoch,336},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:06.734 a uses: [{epoch,337},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:06.746 c uses: [{epoch,338},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:06.932 b uses: [{epoch,339},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:07.267 c uses: [{epoch,340},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:07.334 b uses: [{epoch,341},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:07.460 a uses: [{epoch,342},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:07.669 c uses: [{epoch,343},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:07.736 b uses: [{epoch,344},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:08.165 a uses: [{epoch,345},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:08.194 c uses: [{epoch,346},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:08.541 b uses: [{epoch,347},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:08.702 c uses: [{epoch,348},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:08.894 a uses: [{epoch,349},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:08.944 b uses: [{epoch,350},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:09.212 c uses: [{epoch,351},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:09.346 b uses: [{epoch,352},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:09.598 a uses: [{epoch,353},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:09.614 c uses: [{epoch,354},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:09.748 b uses: [{epoch,355},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:10.135 c uses: [{epoch,356},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:10.150 b uses: [{epoch,357},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
16:35:10.329 a uses: [{epoch,358},{author,a},{upi,[a]},{repair,[c]},{down,[b]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,c]}]},{d2,[]}]
16:35:10.537 c uses: [{epoch,359},{author,c},{upi,[b]},{repair,[a,c]},{down,[]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[a,b,c]}]},{d2,[]}]
16:35:10.552 b uses: [{epoch,360},{author,b},{upi,[b,c]},{repair,[]},{down,[a]},{d,[{author_proc,react},{ps,[{b,a}]},{nodes_up,[b,c]}]},{d2,[]}]
This is a return to the old, possibly asymmetric/unidirectional network
partition simulation scheme. PULSE testing so far for the
symmetric/bidirectional partitioning scheme (via the "islands" approach)
appears to be very stable, yay.
So, let's go back to the harder environment and see what happens!
This is some brute-force-and-not-subtle hackery, but it looks like I've
got the basis for a test that a model checker (QuickCheck or Concuerror
or something else) can use for a good/bad check.
The following properties are examined (but not enforced):
* At each epoch, are each of the chains disjoint? I.e. no single FLU
is a member of different chains at the same epoch.
This is a safety/sanity check.
* For each unique chain UPI list at each epoch, are all of the FLUs in that
chain unanimous in their agreement:
agreed_membership: all UPI FLUs agree about the UPI list
not_agreed: the membership algorithm has not yet agreed on
the UPI list
This is not a safety/sanity check per se, but it can be useful input
into a good safety check.
Some examples:
* At epoch 0, there is no agreement on UPI membership of the one [a,b,c]
chain.
* At epoch 1, there is full agreement,
* At epoch 4, we're back to no agreement.
* At epoch 17, there's agreement on a small chain with UPI list=[a].
(This agreement continues until epoch 216, but that history is omitted
here.)
[{0,
{ok_disjoint,[{[a,b,c],
not_unique,0,
[<<159,215,105,140,29,151,142,2,162,90,225,209,10,102,119,
193,110,72,75,245>>,
<<213,46,129,248,23,50,210,247,145,68,65,112,232,101,28,56,
239,12,78,227>>,
<<230,146,66,183,10,218,57,29,233,166,108,176,118,109,
226,186,190,56,174,108>>]}]}},
{1,{ok_disjoint,[{agreed_membership,[a,b,c]}]}},
{4,
{ok_disjoint,[{not_unique,[a,b,c],
[not_in_this_epoch,
<<208,227,221,233,254,160,36,134,252,106,
124,192,101,171,168,68,169,55,2,54>>]}]}},
{6,
{ok_disjoint,[{not_unique,[a,b,c],
[not_in_this_epoch,
<<191,47,203,143,195,230,71,162,39,132,188,
128,64,39,18,9,73,148,207,220>>]}]}},
{17,{ok_disjoint,[{agreed_membership,[a]}]}},
{24,{ok_disjoint,[{agreed_membership,[a]}]}},
[...]
Starting at epoch 419, the network stabilized, but not fully,
into two "islands" of servers, a alone and b&c together.
At epoch 486, the network is fully stabilized with the same network
partition. We see rapid convergence to two chains, [a] and [b,c].
{419,{ok_disjoint,[{agreed_membership,[a]}]}},
{425,{ok_disjoint,[{agreed_membership,[b]}]}},
{436,{ok_disjoint,[{agreed_membership,[b]}]}},
{442,{ok_disjoint,[{agreed_membership,[b]}]}},
{444,{ok_disjoint,[{agreed_membership,[b]}]}},
{454,{ok_disjoint,[{agreed_membership,[b]}]}},
{456,{ok_disjoint,[{agreed_membership,[b]}]}},
{458,{ok_disjoint,[{agreed_membership,[b]}]}},
{463,{ok_disjoint,[{agreed_membership,[b]}]}},
{468,{ok_disjoint,[{agreed_membership,[b]}]}},
{479,{ok_disjoint,[{agreed_membership,[b]}]}},
{482,{ok_disjoint,[{agreed_membership,[b]}]}},
{486,{ok_disjoint,[{agreed_membership,[a]}]}},
{488,{ok_disjoint,[{agreed_membership,[b]}]}},
{490,{ok_disjoint,[{agreed_membership,[b,c]}]}},
{492,{ok_disjoint,[{agreed_membership,[b,c]}]}}]
foo
