Log from SST of node2: 

130925 18:57:38 [Note] WSREP: State transfer required:
	Group state: 4823adcb-2613-11e3-85b0-d2640a4c137f:1
	Local state: 00000000-0000-0000-0000-000000000000:-1
130925 18:57:38 [Note] WSREP: New cluster view: global state: 4823adcb-2613-11e3-85b0-d2640a4c137f:1, view# 4: Primary, number of nodes: 2, my index: 1, protocol version 2
130925 18:57:38 [Warning] WSREP: Gap in state sequence. Need state transfer.
130925 18:57:40 [Note] WSREP: Running: 'wsrep_sst_xtrabackup --role 'joiner' --address 'ec2-50-17-114-69.compute-1.amazonaws.com' --auth 'sst:secret' --datadir '/var/lib/mysql/' --defaults-file '/etc/my.cnf' --parent '10758''
WSREP_SST: [INFO] Streaming with xbstream (20130925 18:57:40.811)
WSREP_SST: [INFO] Using socat as streamer (20130925 18:57:40.815)
WSREP_SST: [INFO] Evaluating socat -u TCP-LISTEN:4444,reuseaddr stdio | xbstream -x; RC=( ${PIPESTATUS[@]} ) (20130925 18:57:40.839)
130925 18:57:41 [Note] WSREP: Prepared SST request: xtrabackup|ec2-50-17-114-69.compute-1.amazonaws.com:4444/xtrabackup_sst
130925 18:57:41 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
130925 18:57:41 [Note] WSREP: Assign initial position for certification: 1, protocol version: 2
130925 18:57:41 [Warning] WSREP: Failed to prepare for incremental state transfer: Local state UUID (00000000-0000-0000-0000-000000000000) does not match group state UUID (4823adcb-2613-11e3-85b0-d2640a4c137f): 1 (Operation not permitted)
	 at galera/src/replicator_str.cpp:prepare_for_IST():436. IST will be unavailable.
130925 18:57:41 [Note] WSREP: Node 1 (ip-10-149-26-184) requested state transfer from '*any*'. Selected 0 (ip-10-238-195-117)(SYNCED) as donor.
130925 18:57:41 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 1)
130925 18:57:41 [Note] WSREP: Requesting state transfer: success, donor: 0
WSREP_SST: [INFO] Proceeding with SST (20130925 18:57:41.263)
WSREP_SST: [INFO] Cleaning the existing datadir (20130925 18:57:41.268)
removed `/var/lib/mysql/error.log'
removed `/var/lib/mysql/mysql/db.frm'
removed `/var/lib/mysql/mysql/db.MYI'
removed `/var/lib/mysql/mysql/db.MYD'
removed `/var/lib/mysql/mysql/host.frm'
removed `/var/lib/mysql/mysql/host.MYI'
removed `/var/lib/mysql/mysql/host.MYD'
removed `/var/lib/mysql/mysql/user.frm'
removed `/var/lib/mysql/mysql/user.MYI'
removed `/var/lib/mysql/mysql/user.MYD'
removed `/var/lib/mysql/mysql/func.frm'
removed `/var/lib/mysql/mysql/func.MYI'
removed `/var/lib/mysql/mysql/func.MYD'
removed `/var/lib/mysql/mysql/plugin.frm'
removed `/var/lib/mysql/mysql/plugin.MYI'
removed `/var/lib/mysql/mysql/plugin.MYD'
removed `/var/lib/mysql/mysql/servers.frm'
removed `/var/lib/mysql/mysql/servers.MYI'
removed `/var/lib/mysql/mysql/servers.MYD'
removed `/var/lib/mysql/mysql/tables_priv.frm'
removed `/var/lib/mysql/mysql/tables_priv.MYI'
removed `/var/lib/mysql/mysql/tables_priv.MYD'
removed `/var/lib/mysql/mysql/columns_priv.frm'
removed `/var/lib/mysql/mysql/columns_priv.MYI'
removed `/var/lib/mysql/mysql/columns_priv.MYD'
removed `/var/lib/mysql/mysql/help_topic.frm'
removed `/var/lib/mysql/mysql/help_topic.MYI'
removed `/var/lib/mysql/mysql/help_topic.MYD'
removed `/var/lib/mysql/mysql/help_category.frm'
removed `/var/lib/mysql/mysql/help_category.MYI'
removed `/var/lib/mysql/mysql/help_category.MYD'
removed `/var/lib/mysql/mysql/help_relation.frm'
removed `/var/lib/mysql/mysql/help_relation.MYI'
removed `/var/lib/mysql/mysql/help_relation.MYD'
removed `/var/lib/mysql/mysql/help_keyword.frm'
removed `/var/lib/mysql/mysql/help_keyword.MYI'
removed `/var/lib/mysql/mysql/help_keyword.MYD'
removed `/var/lib/mysql/mysql/time_zone_name.frm'
removed `/var/lib/mysql/mysql/time_zone_name.MYI'
removed `/var/lib/mysql/mysql/time_zone_name.MYD'
removed `/var/lib/mysql/mysql/time_zone.frm'
removed `/var/lib/mysql/mysql/time_zone.MYI'
removed `/var/lib/mysql/mysql/time_zone.MYD'
removed `/var/lib/mysql/mysql/time_zone_transition.frm'
removed `/var/lib/mysql/mysql/time_zone_transition.MYI'
removed `/var/lib/mysql/mysql/time_zone_transition.MYD'
removed `/var/lib/mysql/mysql/time_zone_transition_type.frm'
removed `/var/lib/mysql/mysql/time_zone_transition_type.MYI'
removed `/var/lib/mysql/mysql/time_zone_transition_type.MYD'
removed `/var/lib/mysql/mysql/time_zone_leap_second.frm'
removed `/var/lib/mysql/mysql/time_zone_leap_second.MYI'
removed `/var/lib/mysql/mysql/time_zone_leap_second.MYD'
removed `/var/lib/mysql/mysql/proc.frm'
removed `/var/lib/mysql/mysql/proc.MYI'
removed `/var/lib/mysql/mysql/proc.MYD'
removed `/var/lib/mysql/mysql/procs_priv.frm'
removed `/var/lib/mysql/mysql/procs_priv.MYI'
removed `/var/lib/mysql/mysql/procs_priv.MYD'
removed `/var/lib/mysql/mysql/general_log.frm'
removed `/var/lib/mysql/mysql/general_log.CSM'
removed `/var/lib/mysql/mysql/general_log.CSV'
removed `/var/lib/mysql/mysql/slow_log.frm'
removed `/var/lib/mysql/mysql/slow_log.CSM'
removed `/var/lib/mysql/mysql/slow_log.CSV'
removed `/var/lib/mysql/mysql/event.frm'
removed `/var/lib/mysql/mysql/event.MYI'
removed `/var/lib/mysql/mysql/event.MYD'
removed `/var/lib/mysql/mysql/ndb_binlog_index.frm'
removed `/var/lib/mysql/mysql/ndb_binlog_index.MYI'
removed `/var/lib/mysql/mysql/ndb_binlog_index.MYD'
removed `/var/lib/mysql/mysql/proxies_priv.frm'
removed `/var/lib/mysql/mysql/proxies_priv.MYI'
removed `/var/lib/mysql/mysql/proxies_priv.MYD'
removed directory: `/var/lib/mysql/mysql'
removed directory: `/var/lib/mysql/test'
removed `/var/lib/mysql/performance_schema/db.opt'
removed `/var/lib/mysql/performance_schema/cond_instances.frm'
removed `/var/lib/mysql/performance_schema/events_waits_current.frm'
removed `/var/lib/mysql/performance_schema/events_waits_history.frm'
removed `/var/lib/mysql/performance_schema/events_waits_history_long.frm'
removed `/var/lib/mysql/performance_schema/events_waits_summary_by_instance.frm'
removed `/var/lib/mysql/performance_schema/events_waits_summary_by_thread_by_event_name.frm'
removed `/var/lib/mysql/performance_schema/events_waits_summary_global_by_event_name.frm'
removed `/var/lib/mysql/performance_schema/file_instances.frm'
removed `/var/lib/mysql/performance_schema/file_summary_by_event_name.frm'
removed `/var/lib/mysql/performance_schema/file_summary_by_instance.frm'
removed `/var/lib/mysql/performance_schema/mutex_instances.frm'
removed `/var/lib/mysql/performance_schema/performance_timers.frm'
removed `/var/lib/mysql/performance_schema/rwlock_instances.frm'
removed `/var/lib/mysql/performance_schema/setup_consumers.frm'
removed `/var/lib/mysql/performance_schema/setup_instruments.frm'
removed `/var/lib/mysql/performance_schema/setup_timers.frm'
removed `/var/lib/mysql/performance_schema/threads.frm'
removed directory: `/var/lib/mysql/performance_schema'
removed `/var/lib/mysql/ibdata1'
removed `/var/lib/mysql/ib_logfile0'
removed `/var/lib/mysql/ib_logfile1'
removed `/var/lib/mysql/mysql.sock'
WSREP_SST: [INFO] Evaluating socat -u TCP-LISTEN:4444,reuseaddr stdio | xbstream -x; RC=( ${PIPESTATUS[@]} ) (20130925 18:57:41.624)
130925 18:57:55 [Note] WSREP: 0 (ip-10-238-195-117): State transfer to 1 (ip-10-149-26-184) complete.
130925 18:57:55 [Note] WSREP: Member 0 (ip-10-238-195-117) synced with group.
WSREP_SST: [INFO] Preparing the backup at /var/lib/mysql/ (20130925 18:57:55.456)
WSREP_SST: [INFO] Evaluating innobackupex --defaults-file=/etc/my.cnf  --apply-log $rebuildcmd ${DATA} &>${DATA}/innobackup.prepare.log (20130925 18:57:55.460)
WSREP_SST: [INFO] Total time on joiner: 0 seconds (20130925 18:58:57.144)
WSREP_SST: [INFO] Removing the sst_in_progress file (20130925 18:58:57.149)
130925 18:58:57 [Note] WSREP: SST complete, seqno: 1
130925 18:58:57 [Note] Plugin 'FEDERATED' is disabled.
130925 18:58:57 InnoDB: The InnoDB memory heap is disabled
130925 18:58:57 InnoDB: Mutexes and rw_locks use GCC atomic builtins
130925 18:58:57 InnoDB: Compressed tables use zlib 1.2.3
130925 18:58:57 InnoDB: Using Linux native AIO
130925 18:58:57 InnoDB: Initializing buffer pool, size = 10.0G
130925 18:58:58 InnoDB: Completed initialization of buffer pool
130925 18:58:58 InnoDB: highest supported file format is Barracuda.
130925 18:58:59  InnoDB: Waiting for the background threads to start
130925 18:59:00 Percona XtraDB (http://www.percona.com) 5.5.33-rel31.0 started; log sequence number 1598476
130925 18:59:00 [Note] Event Scheduler: Loaded 0 events
130925 18:59:00 [Note] WSREP: Signalling provider to continue.
130925 18:59:00 [Note] WSREP: SST received: 4823adcb-2613-11e3-85b0-d2640a4c137f:1
130925 18:59:00 [Note] WSREP: 1 (ip-10-149-26-184): State transfer from 0 (ip-10-238-195-117) complete.
130925 18:59:00 [Note] WSREP: Shifting JOINER -> JOINED (TO: 1)
130925 18:59:00 [Note] WSREP: Member 1 (ip-10-149-26-184) synced with group.
130925 18:59:00 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 1)
130925 18:59:00 [Note] WSREP: Synchronized with group, ready for connections
130925 18:59:00 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
130925 18:59:00 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.33'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  Percona XtraDB Cluster (GPL), wsrep_23.7.6.r3915