Do you have any network based mountpoint, such as NFS or samba? I have
seen similar behaviour on other Java based applications at GC safepoint
when the network based filesystem loses their connection and reconnects.
On 25/02/2022 06:09, Azamat Hackimov wrote:
Hello!
I recently migrated Cassandra from 3.11.x to 4.0 and got strange
freezes on heavy load. It looks like some nodes in DC stopped
responding and got DN status.
I cannot check status directly on node via nodetool status or even
restart Cassandra with `systemctl restart cassandra` command. Only
viable method is to `kill -9` hanging process and restart Cassandra
again. On 3.11.x there are no such problems.
I have 2 DC with 8 nodes each deployed on good hardware servers, on
CentOS 7 and Java 11 environments with slightly changed default
settings inherited from 3.11.x installation.
The problem shows randomly, I can't determine its source, in the
system.log and debug.log the last event that I could trace does not
have anything to do with the hang. The service just stops responding
and freezes. I can reproduce this with a huge load using dsbulk, but
still can't determine the cause of the problem.
Has anyone encountered a similar problem, and is there any way other
than rolling back to the previous version?
Here my config:
cluster_name: 'mycluster'
num_tokens: '256'
allocate_tokens_for_local_replication_factor: 3
hinted_handoff_enabled: true
max_hint_window_in_ms: 10800000
hinted_handoff_throttle_in_kb: 1024
max_hints_delivery_threads: 2
hints_directory: /data/cassandra/hints
hints_flush_period_in_ms: 10000
max_hints_file_size_in_mb: 128
batchlog_replay_throttle_in_kb: 1024
authenticator: PasswordAuthenticator
authorizer: AllowAllAuthorizer
role_manager: CassandraRoleManager
network_authorizer: AllowAllNetworkAuthorizer
roles_validity_in_ms: 2000
permissions_validity_in_ms: 2000
credentials_validity_in_ms: 2000
partitioner: org.apache.cassandra.dht.Murmur3Partitioner
data_file_directories:
- /data/cassandra/data
commitlog_directory: /data/cassandra/commitlog
cdc_enabled: false
disk_failure_policy: stop
commit_failure_policy: stop
prepared_statements_cache_size_mb:
key_cache_size_in_mb:
key_cache_save_period: 14400
row_cache_size_in_mb: 0
row_cache_save_period: 0
counter_cache_size_in_mb:
counter_cache_save_period: 7200
saved_caches_directory: /data/cassandra/saved_caches
commitlog_sync: periodic
commitlog_sync_period_in_ms: 10000
commitlog_segment_size_in_mb: 32
seed_provider:
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
- seeds: 'node1-1,node1-4,node2-1,node2-4'
concurrent_reads: 32
concurrent_writes: 32
concurrent_counter_writes: 32
concurrent_materialized_view_writes: 32
file_cache_size_in_mb: '1024'
memtable_allocation_type: heap_buffers
index_summary_capacity_in_mb:
index_summary_resize_interval_in_minutes: 60
trickle_fsync: false
trickle_fsync_interval_in_kb: 10240
storage_port: 7000
ssl_storage_port: 7001
listen_address:
start_native_transport: true
native_transport_port: 9042
native_transport_allow_older_protocols: true
rpc_address:
rpc_keepalive: true
incremental_backups: false
snapshot_before_compaction: false
auto_snapshot: true
snapshot_links_per_second: 0
column_index_size_in_kb: 64
column_index_cache_size_in_kb: 2
concurrent_compactors: 5
concurrent_materialized_view_builders: 1
compaction_throughput_mb_per_sec: 200
sstable_preemptive_open_interval_in_mb: 50
read_request_timeout_in_ms: 5000
range_request_timeout_in_ms: 10000
write_request_timeout_in_ms: 2000
counter_write_request_timeout_in_ms: 5000
cas_contention_timeout_in_ms: 1000
truncate_request_timeout_in_ms: 60000
request_timeout_in_ms: 10000
slow_query_log_timeout_in_ms: 500
endpoint_snitch: GossipingPropertyFileSnitch
dynamic_snitch_update_interval_in_ms: 100
dynamic_snitch_reset_interval_in_ms: 600000
dynamic_snitch_badness_threshold: 1.0
server_encryption_options:
internode_encryption: none
enable_legacy_ssl_storage_port: false
keystore: conf/.keystore
keystore_password: cassandra
require_client_auth: false
truststore: conf/.truststore
truststore_password: cassandra
require_endpoint_verification: false
client_encryption_options:
enabled: false
keystore: conf/.keystore
keystore_password: cassandra
require_client_auth: false
internode_compression: dc
inter_dc_tcp_nodelay: false
tracetype_query_ttl: 86400
tracetype_repair_ttl: 604800
enable_user_defined_functions: false
enable_scripted_user_defined_functions: false
windows_timer_interval: 1
transparent_data_encryption_options:
enabled: false
chunk_length_kb: 64
cipher: AES/CBC/PKCS5Padding
key_alias: testing:1
key_provider:
- class_name: org.apache.cassandra.security.JKSKeyProvider
parameters:
- keystore: conf/.keystore
keystore_password: cassandra
store_type: JCEKS
key_password: cassandra
tombstone_warn_threshold: 1000
tombstone_failure_threshold: 100000
replica_filtering_protection:
cached_rows_warn_threshold: 2000
cached_rows_fail_threshold: 32000
batch_size_warn_threshold_in_kb: 5
batch_size_fail_threshold_in_kb: 50
unlogged_batch_across_partitions_warn_threshold: 10
compaction_large_partition_warning_threshold_mb: 100
audit_logging_options:
enabled: true
logger:
- class_name: BinAuditLogger
excluded_categories: DML,QUERY,PREPARE
max_log_size: 1073741824
diagnostic_events_enabled: false
repaired_data_tracking_for_range_reads_enabled: false
repaired_data_tracking_for_partition_reads_enabled: false
report_unconfirmed_repaired_data_mismatches: false
enable_materialized_views: true
enable_sasi_indexes: false
enable_transient_replication: false
enable_drop_compact_storage: false
