Node2 log:

STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE
LOG:  00000: duration: 0.000 ms  bind <unnamed>: SELECT * FROM pg_test  
WHERE data = $1 FOR UPDATE
DETAIL:  parameters: $1 = '1'
LOCATION:  exec_bind_message, postgres.c:1932
STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE
LOG:  00000: duration: 0.000 ms  execute <unnamed>: SELECT * FROM pg_test  
WHERE data = $1 FOR UPDATE
DETAIL:  parameters: $1 = '1'
LOCATION:  exec_execute_message, postgres.c:2151
STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE
LOG:  00000: duration: 0.000 ms  statement: SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(8,4375,0,1
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  SELECT PGR_SYSTEM_COMMAND_FUNCTION(8,4375,0,1
DEBUG:  00000: increased replicate_id to 160391
LOCATION:  exec_simple_query, postgres.c:1264
STATEMENT:  commit
LOG:  00000: duration: 12.768 ms  statement: commit
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  commit
DEBUG:  00000: replication id set from 160391 to 160393
LOCATION:  set_replication_id, replicate.c:1125
STATEMENT:  SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(3,1184683715,859597,160393,1,4376
LOG:  00000: duration: 0.005 ms  statement: SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(3,1184683715,859597,160393,1,4376
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(3,1184683715,859597,160393,1,4376
LOG:  00000: duration: 0.000 ms  statement: SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(8,4376,0,1
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  SELECT PGR_SYSTEM_COMMAND_FUNCTION(8,4376,0,1
DEBUG:  00000: increased replicate_id to 160394
LOCATION:  exec_simple_query, postgres.c:1264
STATEMENT:  begin
LOG:  00000: duration: 0.000 ms  statement: begin
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  begin
DEBUG:  00000: replication id set from 160394 to 160393
LOCATION:  set_replication_id, replicate.c:1125
STATEMENT:  SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(3,1184683715,864601,160393,1,4377
LOG:  00000: duration: 5.003 ms  statement: SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(3,1184683715,864601,160393,1,4377
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  SELECT  
PGR_SYSTEM_COMMAND_FUNCTION(3,1184683715,864601,160393,1,4377
DEBUG:  00000: replication id set from 160393 to 160395
LOCATION:  set_replication_id, replicate.c:1125
STATEMENT:  begin
LOG:  00000: duration: 26704.022 ms  statement: begin
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  begin
DEBUG:  00000: origin's RId = 0 , MyProc->RId = 4377
LOCATION:  ProcSleep, proc.c:778
STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE
LOG:  00000: duration: 0.000 ms  parse <unnamed>: SELECT * FROM pg_test  
WHERE data = $1 FOR UPDATE
LOCATION:  exec_parse_message, postgres.c:1569
STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE
LOG:  00000: duration: 0.241 ms  statement: SELECT 1
LOCATION:  exec_simple_query, postgres.c:1310
STATEMENT:  SELECT 1
DEBUG:  00000: recv_message():unexpected EOF
LOCATION:  recv_message, replicate.c:1287
LOG:  08P01: unexpected EOF on client connection
LOCATION:  SocketBackend, postgres.c:313
WARNING:  01000: This query is not permitted when all replication servers  
fell down
LOCATION:  PostgresMain, postgres.c:3757
LOG:  00000: duration: 0.000 ms  parse <unnamed>: SELECT * FROM pg_test  
WHERE data = $1 FOR UPDATE
LOCATION:  exec_parse_message, postgres.c:1569
STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE
LOG:  00000: duration: 0.000 ms  bind <unnamed>: SELECT * FROM pg_test  
WHERE data = $1 FOR UPDATE
DETAIL:  parameters: $1 = '1'
LOCATION:  exec_bind_message, postgres.c:1932
STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE
LOG:  00000: duration: 0.000 ms  execute <unnamed>: SELECT * FROM pg_test  
WHERE data = $1 FOR UPDATE
DETAIL:  parameters: $1 = '1'
LOCATION:  exec_execute_message, postgres.c:2151
STATEMENT:  SELECT * FROM pg_test WHERE data = $1 FOR UPDATE