title: ScyllaDB : One of the nodes in a 3-node cluster fails to join the cluster after a restart
body: <p>We have a 3 node cluster (single DC) running on Ubuntu 18.04. We had to upgrade all nodes in the cluster (increase the disk space) and hence stopped node-3 first, upgraded the instance and attempted to start it back. It started up after 300 seconds (after failing to connect to the seed nodes), but it has started as a separate cluster. nodetool status on node-3 shows nodes 1 and 2 as down (DN). nodetool status on nodes 1 and 2 show node-3 as down (DN) and 1 and 2 as up (UN).</p>
  <p><strong>Why is node-3 not able to connect to the seed nodes?</strong> Initially when the cluster was created, seeds list was set to only node-1 in all 3 nodes. Before the node-3 was stopped, the seeds list was updated to node-1,node-2,node3. After restart, node-3 is not able to connect to the seed nodes.</p>
  <p><strong>node-3:~$</strong> nodetool status</p>
  <pre><code>Datacenter: scylla_data_center
  ==============================
  Status=Up/Down
  |/ State=Normal/Leaving/Joining/Moving
  --  Address         Load       Tokens       Owns    Host ID                               Rack
  DN  a.b.c.176  ?          256          ?       b1642399-9596-4bc7-8f01-d875f0584e77  scylla_rack
  DN  a.b.c.177  ?          256          ?       e7f6e8f4-c07e-47e7-946d-ba76a272776f  scylla_rack
  UN  a.b.c.198  126.83 GB  256          ?       b29ae510-1edc-4ae4-bd4d-fea2de229750  scylla_rack
  </code></pre>
  <p><strong>node-2:~$</strong> nodetool status</p>
  <pre><code>Datacenter: scylla_data_center
  ==============================
  Status=Up/Down
  |/ State=Normal/Leaving/Joining/Moving
  --  Address         Load       Tokens       Owns    Host ID                               Rack
  UN  a.b.c.176  138.98 GB  256          ?       b1642399-9596-4bc7-8f01-d875f0584e77  scylla_rack
  UN  a.b.c.177  128.26 GB  256          ?       e7f6e8f4-c07e-47e7-946d-ba76a272776f  scylla_rack
  DN  a.b.c.198  127.66 GB  256          ?       b29ae510-1edc-4ae4-bd4d-fea2de229750  scylla_rack
  </code></pre>
  <p><strong>node-1:~$</strong> nodetool describecluster</p>
  <pre><code>Cluster Information:
          Name: Scylla_Cluster
          Snitch: org.apache.cassandra.locator.GossipingPropertyFileSnitch
          DynamicEndPointSnitch: disabled
          Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
          Schema versions:
                  224341ff-6870-30a9-b9c2-977007111e00: [a.b.c.177, a.b.c.176]
  </code></pre>
  <p>How can I analyze what is the cause for this? Please help.</p>
  <p><strong>Logs from syslog:</strong></p>
  <pre><code>Feb 16 05:24:40 e2e-71-39 scylla:  [shard 0] gossip - Connect seeds again ... (299 seconds passed)
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 0] storage_service - Shadow round failed with std::runtime_error (Unable to gossip with any seeds (ShadowRound)), checking remote features with system tables only
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 0] gossip - Node a.b.c.176 does not contain SUPPORTED_FEATURES in gossip, using features saved in system table, features={COMPUTED_COLUMNS, CORRECT_COUNTER_ORDER, CORRECT_NON_COMPOUND_RANGE_TOMBSTONES, CORRECT_STATIC_COMPACT_IN_MC, COUNTERS, DIGEST_INSENSITIVE_TO_EXPIRY, DIGEST_MULTIPARTITION_READ, HINTED_HANDOFF_SEPARATE_CONNECTION, INDEXES, LARGE_PARTITIONS, LA_SSTABLE_FORMAT, LWT, MATERIALIZED_VIEWS, MC_SSTABLE_FORMAT, NONFROZEN_UDTS, PER_TABLE_PARTITIONERS, RANGE_TOMBSTONES, ROLES, ROW_LEVEL_REPAIR, SCHEMA_TABLES_V3, STREAM_WITH_RPC_STREAM, TRUNCATION_TABLE, UNBOUNDED_RANGE_TOMBSTONES, VIEW_VIRTUAL_COLUMNS, WRITE_FAILURE_REPLY, XXHASH}
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 0] gossip - Node a.b.c.177 does not contain SUPPORTED_FEATURES in gossip, using features saved in system table, features={COMPUTED_COLUMNS, CORRECT_COUNTER_ORDER, CORRECT_NON_COMPOUND_RANGE_TOMBSTONES, CORRECT_STATIC_COMPACT_IN_MC, COUNTERS, DIGEST_INSENSITIVE_TO_EXPIRY, DIGEST_MULTIPARTITION_READ, HINTED_HANDOFF_SEPARATE_CONNECTION, INDEXES, LARGE_PARTITIONS, LA_SSTABLE_FORMAT, LWT, MATERIALIZED_VIEWS, MC_SSTABLE_FORMAT, NONFROZEN_UDTS, PER_TABLE_PARTITIONERS, RANGE_TOMBSTONES, ROLES, ROW_LEVEL_REPAIR, SCHEMA_TABLES_V3, STREAM_WITH_RPC_STREAM, TRUNCATION_TABLE, UNBOUNDED_RANGE_TOMBSTONES, VIEW_VIRTUAL_COLUMNS, WRITE_FAILURE_REPLY, XXHASH}
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 0] gossip - Feature check passed. Local node a.b.c.198 features = {COMPUTED_COLUMNS, CORRECT_COUNTER_ORDER, CORRECT_NON_COMPOUND_RANGE_TOMBSTONES, CORRECT_STATIC_COMPACT_IN_MC, COUNTERS, DIGEST_INSENSITIVE_TO_EXPIRY, DIGEST_MULTIPARTITION_READ, HINTED_HANDOFF_SEPARATE_CONNECTION, INDEXES, LARGE_PARTITIONS, LA_SSTABLE_FORMAT, LWT, MATERIALIZED_VIEWS, MC_SSTABLE_FORMAT, NONFROZEN_UDTS, PER_TABLE_PARTITIONERS, RANGE_TOMBSTONES, ROLES, ROW_LEVEL_REPAIR, SCHEMA_TABLES_V3, STREAM_WITH_RPC_STREAM, TRUNCATION_TABLE, UNBOUNDED_RANGE_TOMBSTONES, VIEW_VIRTUAL_COLUMNS, WRITE_FAILURE_REPLY, XXHASH}, Remote common_features = {COMPUTED_COLUMNS, CORRECT_COUNTER_ORDER, CORRECT_NON_COMPOUND_RANGE_TOMBSTONES, CORRECT_STATIC_COMPACT_IN_MC, COUNTERS, DIGEST_INSENSITIVE_TO_EXPIRY, DIGEST_MULTIPARTITION_READ, HINTED_HANDOFF_SEPARATE_CONNECTION, INDEXES, LARGE_PARTITIONS, LA_SSTABLE_FORMAT, LWT, MATERIALIZED_VIEWS, MC_SSTABLE_FORMAT, NONFROZEN_UDTS, PER_TABLE_PARTITIONERS, RANGE_TOMBSTONES, ROLES, ROW_LEVEL_REPAIR, SCHEMA_TABLES_V3, STREAM_WITH_RPC_STREAM, TRUNCATION_TABLE, UNBOUNDED_RANGE_TOMBSTONES, VIEW_VIRTUAL_COLUMNS, WRITE_FAILURE_REPLY, XXHASH}
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 0] storage_service - Restarting a node in NORMAL status
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 0] database - Schema version changed to e0df65b5-0794-39a7-b95f-58df4b065456
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 0] storage_service - Starting up server gossip
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 4] compaction - Compacting [/var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1576-big-Data.db:level=0, /var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1564-big-Data.db:level=0, ]
  Feb 16 05:24:41 e2e-71-39 scylla:  [shard 4] compaction - Compacted 2 sstables to [/var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1588-big-Data.db:level=0, ]. 18905 bytes to 12286 (~64% of original) in 54ms = 0.22MB/s. ~256 total partitions merged to 1.
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] gossip - No gossip backlog; proceeding
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] gossip - Node a.b.c.177 does not contain SUPPORTED_FEATURES in gossip, using features saved in system table, features={COMPUTED_COLUMNS, CORRECT_COUNTER_ORDER, CORRECT_NON_COMPOUND_RANGE_TOMBSTONES, CORRECT_STATIC_COMPACT_IN_MC, COUNTERS, DIGEST_INSENSITIVE_TO_EXPIRY, DIGEST_MULTIPARTITION_READ, HINTED_HANDOFF_SEPARATE_CONNECTION, INDEXES, LARGE_PARTITIONS, LA_SSTABLE_FORMAT, LWT, MATERIALIZED_VIEWS, MC_SSTABLE_FORMAT, NONFROZEN_UDTS, PER_TABLE_PARTITIONERS, RANGE_TOMBSTONES, ROLES, ROW_LEVEL_REPAIR, SCHEMA_TABLES_V3, STREAM_WITH_RPC_STREAM, TRUNCATION_TABLE, UNBOUNDED_RANGE_TOMBSTONES, VIEW_VIRTUAL_COLUMNS, WRITE_FAILURE_REPLY, XXHASH}
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] gossip - Node a.b.c.176 does not contain SUPPORTED_FEATURES in gossip, using features saved in system table, features={COMPUTED_COLUMNS, CORRECT_COUNTER_ORDER, CORRECT_NON_COMPOUND_RANGE_TOMBSTONES, CORRECT_STATIC_COMPACT_IN_MC, COUNTERS, DIGEST_INSENSITIVE_TO_EXPIRY, DIGEST_MULTIPARTITION_READ, HINTED_HANDOFF_SEPARATE_CONNECTION, INDEXES, LARGE_PARTITIONS, LA_SSTABLE_FORMAT, LWT, MATERIALIZED_VIEWS, MC_SSTABLE_FORMAT, NONFROZEN_UDTS, PER_TABLE_PARTITIONERS, RANGE_TOMBSTONES, ROLES, ROW_LEVEL_REPAIR, SCHEMA_TABLES_V3, STREAM_WITH_RPC_STREAM, TRUNCATION_TABLE, UNBOUNDED_RANGE_TOMBSTONES, VIEW_VIRTUAL_COLUMNS, WRITE_FAILURE_REPLY, XXHASH}
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature COMPUTED_COLUMNS is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature CORRECT_COUNTER_ORDER is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature CORRECT_NON_COMPOUND_RANGE_TOMBSTONES is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature CORRECT_STATIC_COMPACT_IN_MC is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature COUNTERS is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature DIGEST_INSENSITIVE_TO_EXPIRY is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature DIGEST_MULTIPARTITION_READ is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature HINTED_HANDOFF_SEPARATE_CONNECTION is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature INDEXES is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature LARGE_PARTITIONS is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature LWT is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature MATERIALIZED_VIEWS is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature MC_SSTABLE_FORMAT is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature NONFROZEN_UDTS is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature PER_TABLE_PARTITIONERS is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature RANGE_TOMBSTONES is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature ROLES is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature ROW_LEVEL_REPAIR is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature SCHEMA_TABLES_V3 is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature STREAM_WITH_RPC_STREAM is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature TRUNCATION_TABLE is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] system_keyspace - Got cluster agreement on truncation table feature. Removing legacy records.
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature UNBOUNDED_RANGE_TOMBSTONES is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature VIEW_VIRTUAL_COLUMNS is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature WRITE_FAILURE_REPLY is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] features - Feature XXHASH is enabled
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] system_keyspace - Legacy records deleted.
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] init - starting system distributed keyspace
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] storage_service - Using saved tokens {981359583743598234, 914643842153801541, 9010590306704705381, 8978199967542709796, 8823634646786289099, 8796898105082258136, 8735550987922770836, 8716862277181876955, 8409105211318848833, 8377749213602607469, 8368791134507409577, 8279480215642442291, 8226961371913237686, 818381322587006401, 8015510533693741419, 7861744753126011670, 7421129492214354842, 7214971269794117680, 7134961561941729532, 6923641246652266152, 6776104411408891615, 6695671858569773702, 6693992036470326300, 6629009954816350525, 6548856613543647119, 6389196725922261142, 6163371136002122168, 6133043365797828528, 585649641794656355, 5738577221751324225, 5738248321319428204, 5705043832523143106, 5668216508314928077, -4557764141784572195, -1644045961680410408, -7337241265398333233, -843795661146775055, -6302540392497142197, -5833743234028982803, -634705565880395230, -4958499958501506050, -5721899000934394495, -5662226590528258745, 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  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] database - Schema version changed to 224341ff-6870-30a9-b9c2-977007111e00
  Feb 16 05:24:53 e2e-71-39 scylla: message repeated 2 times: [  [shard 0] database - Schema version changed to 224341ff-6870-30a9-b9c2-977007111e00]
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 4] compaction - Compacting [/var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1600-big-Data.db:level=0, /var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1588-big-Data.db:level=0, ]
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] storage_service - Node a.b.c.198 state jump to normal
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] storage_service - Remove node a.b.c.198 from pending replacing endpoint
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 4] compaction - Compacted 2 sstables to [/var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1624-big-Data.db:level=0, ]. 18365 bytes to 12119 (~65% of original) in 43ms = 0.27MB/s. ~256 total partitions merged to 1.
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 4] compaction - Compacting [/var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1612-big-Data.db:level=0, /var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1624-big-Data.db:level=0, ]
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] storage_service - NORMAL: node is now in normal status
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] cdc - No generation seen during startup.
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] init - starting tracing
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] storage_service - SSTable data integrity checker is disabled.
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] init - starting batchlog manager
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] init - starting load meter
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] init - starting cf cache hit rate calculator
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] init - starting view update backlog broker
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 0] init - Waiting for gossip to settle before accepting client requests...
  Feb 16 05:24:53 e2e-71-39 scylla:  [shard 4] compaction - Compacted 2 sstables to [/var/lib/scylla/data/system/local-7ad54392bcdd35a684174e047860b377/mc-1636-big-Data.db:level=0, ]. 18198 bytes to 12115 (~66% of original) in 37ms = 0.31MB/s. ~256 total partitions merged to 1.
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] gossip - No gossip backlog; proceeding
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] init - allow replaying hints
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] init - Launching generate_mv_updates for non system tables
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] init - starting the view builder
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 1] compaction - Compacting [/var/lib/scylla/data/system/truncated-38c19fd0fb863310a4b70d0cc66628aa/mc-229-big-Data.db:level=0, /var/lib/scylla/data/system/truncated-38c19fd0fb863310a4b70d0cc66628aa/mc-217-big-Data.db:level=0, ]
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] init - starting native transport
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] storage_service - Starting listening for CQL clients on a.b.c.198:9042 (unencrypted)
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] storage_service - Thrift server listening on a.b.c.198:9160 ...
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] init - serving
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 0] init - Scylla version 4.1.7-0.20200918.2251a1c577 initialization completed.
  Feb 16 05:25:05 e2e-71-39 scylla:  [shard 1] compaction - Compacted 2 sstables to [/var/lib/scylla/data/system/truncated-38c19fd0fb863310a4b70d0cc66628aa/mc-241-big-Data.db:level=0, ]. 10782 bytes to 5549 (~51% of original) in 50ms = 0.11MB/s. ~256 total partitions merged to 1.
  </code></pre>