Hello there, Let me get straight to the point. Yesterday our three node Cassandra production cluster had a problem and we could not find a solution yet. Before taking more radical actions, I would like to consult you about the issue.
We are using Cassandra version 3.11.0. Cluster is living on AWS EC2 nodes of type m4.2xlarge with 32 GBs of RAM. Each node Dockerized using host networking mode. Two EBS SSD volumes are attached to each node, 32GB for commit logs (io1) and 4TB for data directory (gp2). We have been running smoothly for 7 months and filled %55 of data directory on each node. Now our C* nodes fail during bootstrapping phase. Let me paste the logs from system.log file from start to the time of error: INFO [main] 2018-06-19 09:51:32,726 YamlConfigurationLoader.java:89 - Configuration location: file:/opt/apache-cassandra-3.11.0/conf/cassandra.yaml INFO [main] 2018-06-19 09:51:32,954 Config.java:481 - Node configuration:[allocate_tokens_for_keyspace=botanalytics; authenticator=AllowAllAuthenticator; authorizer=AllowAllAuthorizer; auto_bootstrap=false; auto_snapshot=true; back_pressure_enabled=false; back_pressure_strategy=org.apache.cassandra.net.RateBasedBackPressure{high_ratio=0.9, factor=5, flow=FAST}; batch_size_fail_threshold_in_kb=50; batch_size_warn_threshold_in_kb=5; batchlog_replay_throttle_in_kb=1024; broadcast_address=null; broadcast_rpc_address=null; buffer_pool_use_heap_if_exhausted=true; cas_contention_timeout_in_ms=1000; cdc_enabled=false; cdc_free_space_check_interval_ms=250; cdc_raw_directory=/var/data/cassandra/cdc_raw; cdc_total_space_in_mb=0; client_encryption_options=<REDACTED>; cluster_name=Botanalytics Production; column_index_cache_size_in_kb=2; column_index_size_in_kb=64; commit_failure_policy=stop_commit; commitlog_compression=null; commitlog_directory=/var/data/cassandra_commitlog; commitlog_max_compression_buffers_in_pool=3; commitlog_periodic_queue_size=-1; commitlog_segment_size_in_mb=32; commitlog_sync=periodic; commitlog_sync_batch_window_in_ms=NaN; commitlog_sync_period_in_ms=10000; commitlog_total_space_in_mb=8192; compaction_large_partition_warning_threshold_mb=100; compaction_throughput_mb_per_sec=1600; concurrent_compactors=null; concurrent_counter_writes=32; concurrent_materialized_view_writes=32; concurrent_reads=32; concurrent_replicates=null; concurrent_writes=64; counter_cache_keys_to_save=2147483647; counter_cache_save_period=7200; counter_cache_size_in_mb=null; counter_write_request_timeout_in_ms=5000; credentials_cache_max_entries=1000; credentials_update_interval_in_ms=-1; credentials_validity_in_ms=2000; cross_node_timeout=false; data_file_directories=[Ljava.lang.String;@662b4c69; disk_access_mode=auto; disk_failure_policy=best_effort; disk_optimization_estimate_percentile=0.95; disk_optimization_page_cross_chance=0.1; disk_optimization_strategy=ssd; dynamic_snitch=true; dynamic_snitch_badness_threshold=0.1; dynamic_snitch_reset_interval_in_ms=600000; dynamic_snitch_update_interval_in_ms=100; enable_scripted_user_defined_functions=false; enable_user_defined_functions=false; enable_user_defined_functions_threads=true; encryption_options=null; endpoint_snitch=Ec2Snitch; file_cache_size_in_mb=null; gc_log_threshold_in_ms=200; gc_warn_threshold_in_ms=1000; hinted_handoff_disabled_datacenters=[]; hinted_handoff_enabled=true; hinted_handoff_throttle_in_kb=1024; hints_compression=null; hints_directory=null; hints_flush_period_in_ms=10000; incremental_backups=false; index_interval=null; index_summary_capacity_in_mb=null; index_summary_resize_interval_in_minutes=60; initial_token=null; inter_dc_stream_throughput_outbound_megabits_per_sec=200; inter_dc_tcp_nodelay=false; internode_authenticator=null; internode_compression=dc; internode_recv_buff_size_in_bytes=0; internode_send_buff_size_in_bytes=0; key_cache_keys_to_save=2147483647; key_cache_save_period=14400; key_cache_size_in_mb=null; listen_address=172.31.6.233; listen_interface=null; listen_interface_prefer_ipv6=false; listen_on_broadcast_address=false; max_hint_window_in_ms=10800000; max_hints_delivery_threads=2; max_hints_file_size_in_mb=128; max_mutation_size_in_kb=null; max_streaming_retries=3; max_value_size_in_mb=256; memtable_allocation_type=heap_buffers; memtable_cleanup_threshold=null; memtable_flush_writers=0; memtable_heap_space_in_mb=null; memtable_offheap_space_in_mb=null; min_free_space_per_drive_in_mb=50; native_transport_max_concurrent_connections=-1; native_transport_max_concurrent_connections_per_ip=-1; native_transport_max_frame_size_in_mb=256; native_transport_max_threads=128; native_transport_port=9042; native_transport_port_ssl=null; num_tokens=8; otc_backlog_expiration_interval_ms=200; otc_coalescing_enough_coalesced_messages=8; otc_coalescing_strategy=DISABLED; otc_coalescing_window_us=200; partitioner=org.apache.cassandra.dht.Murmur3Partitioner; permissions_cache_max_entries=1000; permissions_update_interval_in_ms=-1; permissions_validity_in_ms=2000; phi_convict_threshold=8.0; prepared_statements_cache_size_mb=null; range_request_timeout_in_ms=10000; read_request_timeout_in_ms=5000; request_scheduler=org.apache.cassandra.scheduler.NoScheduler; request_scheduler_id=null; request_scheduler_options=null; request_timeout_in_ms=10000; role_manager=CassandraRoleManager; roles_cache_max_entries=1000; roles_update_interval_in_ms=-1; roles_validity_in_ms=2000; row_cache_class_name=org.apache.cassandra.cache.OHCProvider; row_cache_keys_to_save=2147483647; row_cache_save_period=0; row_cache_size_in_mb=0; rpc_address=172.31.6.233; rpc_interface=null; rpc_interface_prefer_ipv6=false; rpc_keepalive=true; rpc_listen_backlog=50; rpc_max_threads=2147483647; rpc_min_threads=16; rpc_port=9160; rpc_recv_buff_size_in_bytes=null; rpc_send_buff_size_in_bytes=null; rpc_server_type=sync; saved_caches_directory=/var/data/cassandra/saved_caches; seed_provider=org.apache.cassandra.locator.SimpleSeedProvider{seeds=172.31.30.86,172.31.6.233,172.31.32.108}; server_encryption_options=<REDACTED>; slow_query_log_timeout_in_ms=500; snapshot_before_compaction=false; ssl_storage_port=7001; sstable_preemptive_open_interval_in_mb=50; start_native_transport=true; start_rpc=false; storage_port=7000; stream_throughput_outbound_megabits_per_sec=200; streaming_keep_alive_period_in_secs=300; streaming_socket_timeout_in_ms=86400000; thrift_framed_transport_size_in_mb=15; thrift_max_message_length_in_mb=16; thrift_prepared_statements_cache_size_mb=null; tombstone_failure_threshold=100000; tombstone_warn_threshold=1000; tracetype_query_ttl=86400; tracetype_repair_ttl=604800; transparent_data_encryption_options=org.apache.cassandra.config.TransparentDataEncryptionOptions@fa49800; trickle_fsync=false; trickle_fsync_interval_in_kb=10240; truncate_request_timeout_in_ms=60000; unlogged_batch_across_partitions_warn_threshold=10; user_defined_function_fail_timeout=1500; user_defined_function_warn_timeout=500; user_function_timeout_policy=die; windows_timer_interval=1; write_request_timeout_in_ms=2000] INFO [main] 2018-06-19 09:51:32,954 DatabaseDescriptor.java:366 - DiskAccessMode 'auto' determined to be mmap, indexAccessMode is mmap INFO [main] 2018-06-19 09:51:32,954 DatabaseDescriptor.java:420 - Global memtable on-heap threshold is enabled at 2011MB INFO [main] 2018-06-19 09:51:32,954 DatabaseDescriptor.java:424 - Global memtable off-heap threshold is enabled at 2011MB INFO [main] 2018-06-19 09:51:33,198 RateBasedBackPressure.java:123 - Initialized back-pressure with high ratio: 0.9, factor: 5, flow: FAST, window size: 2000. INFO [main] 2018-06-19 09:51:33,198 DatabaseDescriptor.java:710 - Back-pressure is disabled with strategy org.apache.cassandra.net.RateBasedBackPressure{high_ratio=0.9, factor=5, flow=FAST}. INFO [main] 2018-06-19 09:51:33,228 Ec2Snitch.java:67 - EC2Snitch using region: us-west-2, zone: 2c. INFO [main] 2018-06-19 09:51:33,332 JMXServerUtils.java:249 - Configured JMX server at: service:jmx:rmi://0.0.0.0/jndi/rmi://0.0.0.0:7199/jmxrmi INFO [main] 2018-06-19 09:51:33,337 CassandraDaemon.java:471 - Hostname: cassandra3.system.botanalytics.co INFO [main] 2018-06-19 09:51:33,338 CassandraDaemon.java:478 - JVM vendor/version: OpenJDK 64-Bit Server VM/1.8.0_131 INFO [main] 2018-06-19 09:51:33,339 CassandraDaemon.java:479 - Heap size: 7.855GiB/7.855GiB INFO [main] 2018-06-19 09:51:33,340 CassandraDaemon.java:484 - Code Cache Non-heap memory: init = 2555904(2496K) used = 5440896(5313K) committed = 5505024(5376K) max = 251658240(245760K) INFO [main] 2018-06-19 09:51:33,340 CassandraDaemon.java:484 - Metaspace Non-heap memory: init = 0(0K) used = 17400896(16993K) committed = 17956864(17536K) max = -1(-1K) INFO [main] 2018-06-19 09:51:33,340 CassandraDaemon.java:484 - Compressed Class Space Non-heap memory: init = 0(0K) used = 2076056(2027K) committed = 2228224(2176K) max = 1073741824(1048576K) INFO [main] 2018-06-19 09:51:33,340 CassandraDaemon.java:484 - G1 Eden Space Heap memory: init = 444596224(434176K) used = 85983232(83968K) committed = 444596224(434176K) max = -1(-1K) INFO [main] 2018-06-19 09:51:33,341 CassandraDaemon.java:484 - G1 Survivor Space Heap memory: init = 0(0K) used = 0(0K) committed = 0(0K) max = -1(-1K) INFO [main] 2018-06-19 09:51:33,341 CassandraDaemon.java:484 - G1 Old Gen Heap memory: init = 7990149120(7802880K) used = 0(0K) committed = 7990149120(7802880K) max = 8434745344(8237056K) INFO [main] 2018-06-19 09:51:33,341 CassandraDaemon.java:486 - Classpath: /opt/apache-cassandra-3.11.0/conf:/opt/apache-cassandra-3.11.0/build/classes/main:/opt/apache-cassandra-3.11.0/build/classes/thrift:/opt/apache-cassandra-3.11.0/lib/HdrHistogram-2.1.9.jar:/opt/apache-cassandra-3.11.0/lib/ST4-4.0.8.jar:/opt/apache-cassandra-3.11.0/lib/airline-0.6.jar:/opt/apache-cassandra-3.11.0/lib/antlr-runtime-3.5.2.jar:/opt/apache-cassandra-3.11.0/lib/apache-cassandra-3.11.0.jar:/opt/apache-cassandra-3.11.0/lib/apache-cassandra-thrift-3.11.0.jar:/opt/apache-cassandra-3.11.0/lib/asm-5.0.4.jar:/opt/apache-cassandra-3.11.0/lib/caffeine-2.2.6.jar:/opt/apache-cassandra-3.11.0/lib/cassandra-driver-core-3.0.1-shaded.jar:/opt/apache-cassandra-3.11.0/lib/commons-cli-1.1.jar:/opt/apache-cassandra-3.11.0/lib/commons-codec-1.9.jar:/opt/apache-cassandra-3.11.0/lib/commons-lang3-3.1.jar:/opt/apache-cassandra-3.11.0/lib/commons-math3-3.2.jar:/opt/apache-cassandra-3.11.0/lib/compress-lzf-0.8.4.jar:/opt/apache-cassandra-3.11.0/lib/concurrent-trees-2.4.0.jar:/opt/apache-cassandra-3.11.0/lib/concurrentlinkedhashmap-lru-1.4.jar:/opt/apache-cassandra-3.11.0/lib/disruptor-3.0.1.jar:/opt/apache-cassandra-3.11.0/lib/ecj-4.4.2.jar:/opt/apache-cassandra-3.11.0/lib/guava-18.0.jar:/opt/apache-cassandra-3.11.0/lib/high-scale-lib-1.0.6.jar:/opt/apache-cassandra-3.11.0/lib/hppc-0.5.4.jar:/opt/apache-cassandra-3.11.0/lib/jackson-core-asl-1.9.2.jar:/opt/apache-cassandra-3.11.0/lib/jackson-mapper-asl-1.9.2.jar:/opt/apache-cassandra-3.11.0/lib/jamm-0.3.0.jar:/opt/apache-cassandra-3.11.0/lib/javax.inject.jar:/opt/apache-cassandra-3.11.0/lib/jbcrypt-0.3m.jar:/opt/apache-cassandra-3.11.0/lib/jcl-over-slf4j-1.7.7.jar:/opt/apache-cassandra-3.11.0/lib/jctools-core-1.2.1.jar:/opt/apache-cassandra-3.11.0/lib/jflex-1.6.0.jar:/opt/apache-cassandra-3.11.0/lib/jna-4.4.0.jar:/opt/apache-cassandra-3.11.0/lib/joda-time-2.4.jar:/opt/apache-cassandra-3.11.0/lib/json-simple-1.1.jar:/opt/apache-cassandra-3.11.0/lib/jstackjunit-0.0.1.jar:/opt/apache-cassandra-3.11.0/lib/libthrift-0.9.2.jar:/opt/apache-cassandra-3.11.0/lib/log4j-over-slf4j-1.7.7.jar:/opt/apache-cassandra-3.11.0/lib/logback-classic-1.1.3.jar:/opt/apache-cassandra-3.11.0/lib/logback-core-1.1.3.jar:/opt/apache-cassandra-3.11.0/lib/lz4-1.3.0.jar:/opt/apache-cassandra-3.11.0/lib/metrics-core-3.1.0.jar:/opt/apache-cassandra-3.11.0/lib/metrics-jvm-3.1.0.jar:/opt/apache-cassandra-3.11.0/lib/metrics-logback-3.1.0.jar:/opt/apache-cassandra-3.11.0/lib/netty-all-4.0.44.Final.jar:/opt/apache-cassandra-3.11.0/lib/ohc-core-0.4.4.jar:/opt/apache-cassandra-3.11.0/lib/ohc-core-j8-0.4.4.jar:/opt/apache-cassandra-3.11.0/lib/reporter-config-base-3.0.3.jar:/opt/apache-cassandra-3.11.0/lib/reporter-config3-3.0.3.jar:/opt/apache-cassandra-3.11.0/lib/sigar-1.6.4.jar:/opt/apache-cassandra-3.11.0/lib/slf4j-api-1.7.7.jar:/opt/apache-cassandra-3.11.0/lib/snakeyaml-1.11.jar:/opt/apache-cassandra-3.11.0/lib/snappy-java-1.1.1.7.jar:/opt/apache-cassandra-3.11.0/lib/snowball-stemmer-1.3.0.581.1.jar:/opt/apache-cassandra-3.11.0/lib/stream-2.5.2.jar:/opt/apache-cassandra-3.11.0/lib/thrift-server-0.3.7.jar:/opt/apache-cassandra-3.11.0/lib/jsr223/*/*.jar:/opt/apache-cassandra-3.11.0/lib/jamm-0.3.0.jar INFO [main] 2018-06-19 09:51:33,342 CassandraDaemon.java:488 - JVM Arguments: [-Xloggc:/opt/apache-cassandra-3.11.0/logs/gc.log, -ea, -XX:+UseThreadPriorities, -XX:ThreadPriorityPolicy=42, -XX:+HeapDumpOnOutOfMemoryError, -Xss256k, -XX:StringTableSize=1000003, -XX:+AlwaysPreTouch, -XX:-UseBiasedLocking, -XX:+UseTLAB, -XX:+ResizeTLAB, -XX:+UseNUMA, -XX:+PerfDisableSharedMem, -Djava.net.preferIPv4Stack=true, -XX:+UseG1GC, -XX:+PrintGCDetails, -XX:+PrintGCDateStamps, -XX:+PrintHeapAtGC, -XX:+PrintTenuringDistribution, -XX:+PrintGCApplicationStoppedTime, -XX:+PrintPromotionFailure, -XX:+UseGCLogFileRotation, -XX:NumberOfGCLogFiles=10, -XX:GCLogFileSize=10M, -Xms8043M, -Xmx8043M, -XX:CompileCommandFile=/opt/apache-cassandra-3.11.0/conf/hotspot_compiler, -javaagent:/opt/apache-cassandra-3.11.0/lib/jamm-0.3.0.jar, -Dcassandra.jmx.remote.port=7199, -Dcom.sun.management.jmxremote.rmi.port=7199, -Dcom.sun.management.jmxremote.password.file=/etc/cassandra/jmxremote.password, -Djava.library.path=/opt/apache-cassandra-3.11.0/lib/sigar-bin, -Dlogback.configurationFile=logback.xml, -Dcassandra.logdir=/opt/apache-cassandra-3.11.0/logs, -Dcassandra.storagedir=/opt/apache-cassandra-3.11.0/data, -Dcassandra-foreground=yes] INFO [main] 2018-06-19 09:51:33,442 NativeLibrary.java:174 - JNA mlockall successful WARN [main] 2018-06-19 09:51:33,443 StartupChecks.java:127 - jemalloc shared library could not be preloaded to speed up memory allocations INFO [main] 2018-06-19 09:51:33,443 StartupChecks.java:167 - JMX is enabled to receive remote connections on port: 7199 WARN [main] 2018-06-19 09:51:33,444 StartupChecks.java:197 - OpenJDK is not recommended. Please upgrade to the newest Oracle Java release INFO [main] 2018-06-19 09:51:33,446 SigarLibrary.java:44 - Initializing SIGAR library INFO [main] 2018-06-19 09:51:33,459 SigarLibrary.java:180 - Checked OS settings and found them configured for optimal performance. INFO [main] 2018-06-19 09:54:10,270 QueryProcessor.java:115 - Initialized prepared statement caches with 31 MB (native) and 31 MB (Thrift) INFO [main] 2018-06-19 09:54:18,131 ColumnFamilyStore.java:406 - Initializing system.IndexInfo INFO [SSTableBatchOpen:2] 2018-06-19 09:54:19,249 BufferPool.java:230 - Global buffer pool is enabled, when pool is exhausted (max is 512.000MiB) it will allocate on heap INFO [main] 2018-06-19 09:54:19,490 CacheService.java:112 - Initializing key cache with capacity of 100 MBs. INFO [main] 2018-06-19 09:54:19,498 CacheService.java:134 - Initializing row cache with capacity of 0 MBs INFO [main] 2018-06-19 09:54:19,500 CacheService.java:163 - Initializing counter cache with capacity of 50 MBs INFO [main] 2018-06-19 09:54:19,501 CacheService.java:174 - Scheduling counter cache save to every 7200 seconds (going to save all keys). INFO [main] 2018-06-19 09:54:19,635 ColumnFamilyStore.java:406 - Initializing system.batches INFO [main] 2018-06-19 09:54:19,750 ColumnFamilyStore.java:406 - Initializing system.paxos INFO [main] 2018-06-19 09:54:19,990 ColumnFamilyStore.java:406 - Initializing system.local INFO [main] 2018-06-19 09:54:20,668 ColumnFamilyStore.java:406 - Initializing system.peers INFO [main] 2018-06-19 09:54:21,235 ColumnFamilyStore.java:406 - Initializing system.peer_events INFO [main] 2018-06-19 09:54:21,344 ColumnFamilyStore.java:406 - Initializing system.range_xfers INFO [main] 2018-06-19 09:54:22,274 ColumnFamilyStore.java:406 - Initializing system.compaction_history INFO [main] 2018-06-19 09:54:24,256 ColumnFamilyStore.java:406 - Initializing system.sstable_activity INFO [main] 2018-06-19 09:54:26,305 ColumnFamilyStore.java:406 - Initializing system.size_estimates INFO [main] 2018-06-19 09:54:27,331 ColumnFamilyStore.java:406 - Initializing system.available_ranges INFO [main] 2018-06-19 09:54:27,438 ColumnFamilyStore.java:406 - Initializing system.transferred_ranges INFO [main] 2018-06-19 09:54:27,548 ColumnFamilyStore.java:406 - Initializing system.views_builds_in_progress INFO [main] 2018-06-19 09:54:27,962 ColumnFamilyStore.java:406 - Initializing system.built_views INFO [main] 2018-06-19 09:54:28,372 ColumnFamilyStore.java:406 - Initializing system.hints INFO [main] 2018-06-19 09:54:28,485 ColumnFamilyStore.java:406 - Initializing system.batchlog INFO [main] 2018-06-19 09:54:29,308 ColumnFamilyStore.java:406 - Initializing system.prepared_statements INFO [main] 2018-06-19 09:54:30,199 ColumnFamilyStore.java:406 - Initializing system.schema_keyspaces INFO [main] 2018-06-19 09:54:30,307 ColumnFamilyStore.java:406 - Initializing system.schema_columnfamilies INFO [main] 2018-06-19 09:54:30,415 ColumnFamilyStore.java:406 - Initializing system.schema_columns INFO [main] 2018-06-19 09:54:30,522 ColumnFamilyStore.java:406 - Initializing system.schema_triggers INFO [main] 2018-06-19 09:54:30,644 ColumnFamilyStore.java:406 - Initializing system.schema_usertypes INFO [main] 2018-06-19 09:54:30,751 ColumnFamilyStore.java:406 - Initializing system.schema_functions INFO [main] 2018-06-19 09:54:30,857 ColumnFamilyStore.java:406 - Initializing system.schema_aggregates INFO [main] 2018-06-19 09:54:30,895 ViewManager.java:137 - Not submitting build tasks for views in keyspace system as storage service is not initialized INFO [main] 2018-06-19 09:54:30,995 ApproximateTime.java:44 - Scheduling approximate time-check task with a precision of 10 milliseconds INFO [main] 2018-06-19 09:54:31,398 StorageService.java:599 - Populating token metadata from system tables INFO [main] 2018-06-19 09:54:31,417 StorageService.java:606 - Token metadata: Normal Tokens: /172.31.6.233:[-8558296730980030069, -7525382470676135506, -5365679946543067437, -5024744468396129791, -621548782781630789, 2560648275603582213, 3045808823380974565, 4528773636540445635] /172.31.30.86:[-4996254754506875993, -4643155412471971849, -4368808458340046140, -3850506734999042317, -2258278949288203779, 595567677047792091, 2603367051083131788, 4627331559939659350] /172.31.32.108:[-8971900399054629031, -8230309605059852620, -7924781343155531759, -3886073213015791996, 1365546428882466509, 5068042707833365047, 5447578083699391181, 5537482776219757111] INFO [main] 2018-06-19 09:54:32,136 ColumnFamilyStore.java:406 - Initializing system_schema.keyspaces INFO [main] 2018-06-19 09:54:33,162 ColumnFamilyStore.java:406 - Initializing system_schema.tables INFO [main] 2018-06-19 09:54:34,069 ColumnFamilyStore.java:406 - Initializing system_schema.columns INFO [main] 2018-06-19 09:54:34,582 ColumnFamilyStore.java:406 - Initializing system_schema.triggers INFO [main] 2018-06-19 09:54:34,901 ColumnFamilyStore.java:406 - Initializing system_schema.dropped_columns INFO [main] 2018-06-19 09:54:35,329 ColumnFamilyStore.java:406 - Initializing system_schema.views INFO [main] 2018-06-19 09:54:35,550 ColumnFamilyStore.java:406 - Initializing system_schema.types INFO [main] 2018-06-19 09:54:35,660 ColumnFamilyStore.java:406 - Initializing system_schema.functions INFO [main] 2018-06-19 09:54:35,772 ColumnFamilyStore.java:406 - Initializing system_schema.aggregates INFO [main] 2018-06-19 09:54:35,991 ColumnFamilyStore.java:406 - Initializing system_schema.indexes INFO [main] 2018-06-19 09:54:36,140 ViewManager.java:137 - Not submitting build tasks for views in keyspace system_schema as storage service is not initialized ERROR [main] 2018-06-19 09:54:58,186 CassandraDaemon.java:706 - Exception encountered during startup java.lang.AssertionError: null at org.apache.cassandra.db.lifecycle.LogReplicaSet.addReplica(LogReplicaSet.java:63) ~[apache-cassandra-3.11.0.jar:3.11.0] at java.util.ArrayList.forEach(ArrayList.java:1249) ~[na:1.8.0_131] at org.apache.cassandra.db.lifecycle.LogReplicaSet.addReplicas(LogReplicaSet.java:57) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.db.lifecycle.LogFile.<init>(LogFile.java:146) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.db.lifecycle.LogFile.make(LogFile.java:94) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.db.lifecycle.LogTransaction$LogFilesByName.removeUnfinishedLeftovers(LogTransaction.java:461) ~[apache-cassandra-3.11.0.jar:3.11.0] at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_131] at java.util.HashMap$EntrySpliterator.tryAdvance(HashMap.java:1712) ~[na:1.8.0_131] at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) ~[na:1.8.0_131] at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498) ~[na:1.8.0_131] at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485) ~[na:1.8.0_131] at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_131] at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230) ~[na:1.8.0_131] at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196) ~[na:1.8.0_131] at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_131] at java.util.stream.ReferencePipeline.allMatch(ReferencePipeline.java:454) ~[na:1.8.0_131] at org.apache.cassandra.db.lifecycle.LogTransaction$LogFilesByName.removeUnfinishedLeftovers(LogTransaction.java:456) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.db.lifecycle.LogTransaction.removeUnfinishedLeftovers(LogTransaction.java:423) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.db.lifecycle.LogTransaction.removeUnfinishedLeftovers(LogTransaction.java:415) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.db.lifecycle.LifecycleTransaction.removeUnfinishedLeftovers(LifecycleTransaction.java:544) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.db.ColumnFamilyStore.scrubDataDirectories(ColumnFamilyStore.java:636) ~[apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:275) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:600) [apache-cassandra-3.11.0.jar:3.11.0] at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:689) [apache-cassandra-3.11.0.jar:3.11.0] Do you have any idea what may be wrong? Thanks in advance, Deniz