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From Hartmut Inerle <hartmut.ine...@ericsson.com>
Subject RE: Node always dieing
Date Mon, 10 Apr 2017 17:13:46 GMT
Hi,

There is an invalid IP in the String.
.SimpleSeedProvider{seeds=10.100.100.19, 10.100.100.85, 10.100.100.185, 10.100.100.161, 10.100.100.52,
10.100.1000.213};

Regards
  Hartmut


From: Chris Mawata [mailto:chris.mawata@gmail.com]
Sent: Montag, 10. April 2017 13:37
To: user@cassandra.apache.org
Subject: Re: Node always dieing

Notice
.SimpleSeedProvider{seeds=10.100.100.19, 10.100.100.85, 10.100.100.185, 10.100.100.161, 10.100.100.52,
10.100.1000.213};
Why do you have all six of your nodes as seeds? is it possible that the last one you added
used itself as the seed and is isolated?

On Thu, Apr 6, 2017 at 6:48 AM, Cogumelos Maravilha <cogumelosmaravilha@sapo.pt<mailto:cogumelosmaravilha@sapo.pt>>
wrote:

Yes C* is running as cassandra:

cassand+  2267     1 99 10:18 ?        00:02:56 java -Xloggc:/var/log/cassandra/gc.log -ea
-XX:+UseThreadPriorities -XX:Threa...

INFO  [main] 2017-04-06 10:35:42,956 Config.java:474 - Node configuration:[allocate_tokens_for_keyspace=null;
authenticator=PasswordAuthenticator; authorizer=CassandraAuthorizer; auto_bootstrap=true;
auto_snapshot=true; back_pressure_enabled=false; back_pressure_strategy=org.apache.cassandra.net<http://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=6000000; cdc_enabled=false; cdc_free_space_check_interval_ms=250;
cdc_raw_directory=null; cdc_total_space_in_mb=0; client_encryption_options=<REDACTED>;
cluster_name=company; column_index_cache_size_in_kb=2; column_index_size_in_kb=64; commit_failure_policy=ignore;
commitlog_compression=null; commitlog_directory=/mnt/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=null;
compaction_large_partition_warning_threshold_mb=100; compaction_throughput_mb_per_sec=16;
concurrent_compactors=null; concurrent_counter_writes=32; concurrent_materialized_view_writes=32;
concurrent_reads=32; concurrent_replicates=null; concurrent_writes=32; counter_cache_keys_to_save=2147483647;
counter_cache_save_period=7200; counter_cache_size_in_mb=null; counter_write_request_timeout_in_ms=6000000;
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;@223f3642; disk_access_mode=auto;
disk_failure_policy=ignore; 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=SimpleSnitch; 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=/mnt/cassandra/hints; 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=10.100.100.213; 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=256; otc_coalescing_strategy=TIMEHORIZON; 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=6000000; read_request_timeout_in_ms=6000000;
request_scheduler=org.apache.cassandra.scheduler.NoScheduler; request_scheduler_id=null; request_scheduler_options=null;
request_timeout_in_ms=6000000; 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=10.100.100.213;
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=/mnt/cassandra/saved_caches;
seed_provider=org.apache.cassandra.locator.SimpleSeedProvider{seeds=10.100.100.19, 10.100.100.85,
10.100.100.185, 10.100.100.161, 10.100.100.52, 10.100.1000.213}; server_encryption_options=<REDACTED>;
slow_query_log_timeout_in_ms=6000000; 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@38c5cc4c<mailto:transparent_data_encryption_options=org.apache.cassandra.config.TransparentDataEncryptionOptions@38c5cc4c>;
trickle_fsync=false; trickle_fsync_interval_in_kb=10240; truncate_request_timeout_in_ms=6000000;
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=6000000]
Thanks

On 04/06/2017 11:30 AM, benjamin roth wrote:
Have you checked the effective limits of a running CS process?
Is CS run as Cassandra? Just to rule out missing file perms.


Am 06.04.2017 12:24 schrieb "Cogumelos Maravilha" <cogumelosmaravilha@sapo.pt<mailto:cogumelosmaravilha@sapo.pt>>:

From cassandra.yaml:
hints_directory: /mnt/cassandra/hints
data_file_directories:
    - /mnt/cassandra/data
commitlog_directory: /mnt/cassandra/commitlog
saved_caches_directory: /mnt/cassandra/saved_caches

drwxr-xr-x   3 cassandra cassandra   23 Apr  5 16:03 mnt/

drwxr-xr-x 6 cassandra cassandra  68 Apr  5 16:17 ./
drwxr-xr-x 3 cassandra cassandra  23 Apr  5 16:03 ../
drwxr-xr-x 2 cassandra cassandra  80 Apr  6 10:07 commitlog/
drwxr-xr-x 8 cassandra cassandra 124 Apr  5 16:17 data/
drwxr-xr-x 2 cassandra cassandra  72 Apr  5 16:20 hints/
drwxr-xr-x 2 cassandra cassandra  49 Apr  5 20:17 saved_caches/

cassand+  2267     1 99 10:18 ?        00:02:56 java -Xloggc:/var/log/cassandra/gc.log -ea
-XX:+UseThreadPriorities -XX:Threa...

/dev/mapper/um_vg-xfs_lv  885G   27G  858G   4% /mnt

On /etc/security/limits.conf

*           -       memlock      unlimited
*           -      nofile      100000
*           -      nproc          32768
*           -      as           unlimited

On /etc/security/limits.d/cassandra.conf

cassandra  -  memlock  unlimited
cassandra  -  nofile   100000
cassandra  -  as       unlimited
cassandra  -  nproc    32768

On /etc/sysctl.conf

vm.max_map_count = 1048575

On /etc/systcl.d/cassanda.conf

vm.max_map_count = 1048575
net.ipv4.tcp_keepalive_time=600
On /etc/pam.d/su
...
session    required   pam_limits.so
...

Distro is the currently Ubuntu LTS.
Thanks


On 04/06/2017 10:39 AM, benjamin roth wrote:
Cassandra cannot write an SSTable to disk. Are you sure the disk/volume where SSTables reside
(normally /var/lib/cassandra/data) is writeable for the CS user and has enough free space?
The CDC warning also implies that.
The other warnings indicate you are probably not running CS as root and you did not set an
appropriate limit for max open files. Running out of open files can also be a reason for the
IO error.

2017-04-06 11:34 GMT+02:00 Cogumelos Maravilha <cogumelosmaravilha@sapo.pt<mailto:cogumelosmaravilha@sapo.pt>>:
Hi list,

I'm using C* 3.10 in a 6 nodes cluster RF=2. All instances type
i3.xlarge (AWS) with 32GB, 2 cores and SSD LVM XFS formated 885G. I have
one node that is always dieing and I don't understand why. Can anyone
give me some hints please. All nodes using the same configuration.

Thanks in advance.

INFO  [IndexSummaryManager:1] 2017-04-06 05:22:18,352
IndexSummaryRedistribution.java:75 - Redistributing index summaries
ERROR [MemtablePostFlush:22] 2017-04-06 06:00:26,800
CassandraDaemon.java:229 - Exception in thread
Thread[MemtablePostFlush:22,5,main]
org.apache.cassandra.io<http://org.apache.cassandra.io>.FSWriteError: java.io.IOException:
Input/output
error
    at
org.apache.cassandra.io.util.SequentialWriter.syncDataOnlyInternal(SequentialWriter.java:173)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io.util.SequentialWriter.syncInternal(SequentialWriter.java:185)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.compress.CompressedSequentialWriter.access$100(CompressedSequentialWriter.java:38)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.compress.CompressedSequentialWriter$TransactionalProxy.doPrepare(CompressedSequentialWriter.java:307)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit(Transactional.java:173)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io.util.SequentialWriter.prepareToCommit(SequentialWriter.java:358)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.sstable.format.big.BigTableWriter$TransactionalProxy.doPrepare(BigTableWriter.java:367)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit(Transactional.java:173)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.sstable.format.SSTableWriter.prepareToCommit(SSTableWriter.java:281)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.sstable.SimpleSSTableMultiWriter.prepareToCommit(SimpleSSTableMultiWriter.java:101)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.db.ColumnFamilyStore$Flush.flushMemtable(ColumnFamilyStore.java:1153)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1086)
~[apache-cassandra-3.10.jar:3.10]
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
~[na:1.8.0_121]
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[na:1.8.0_121]
    at
org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:79)
[apache-cassandra-3.10.jar:3.10]
    at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
Caused by: java.io.IOException: Input/output error
    at sun.nio.ch.FileDispatcherImpl.force0(Native Method) ~[na:1.8.0_121]
    at sun.nio.ch.FileDispatcherImpl.force(FileDispatcherImpl.java:76)
~[na:1.8.0_121]
    at sun.nio.ch.FileChannelImpl.force(FileChannelImpl.java:388)
~[na:1.8.0_121]
    at org.apache.cassandra.utils.SyncUtil.force(SyncUtil.java:158)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io.util.SequentialWriter.syncDataOnlyInternal(SequentialWriter.java:169)
~[apache-cassandra-3.10.jar:3.10]
    ... 15 common frames omitted
INFO  [IndexSummaryManager:1] 2017-04-06 06:22:18,366
IndexSummaryRedistribution.java:75 - Redistributing index summaries
ERROR [MemtablePostFlush:31] 2017-04-06 06:39:19,525
CassandraDaemon.java:229 - Exception in thread
Thread[MemtablePostFlush:31,5,main]
org.apache.cassandra.io<http://org.apache.cassandra.io>.FSWriteError: java.io.IOException:
Input/output
error
    at
org.apache.cassandra.io.util.SequentialWriter.syncDataOnlyInternal(SequentialWriter.java:173)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io.util.SequentialWriter.syncInternal(SequentialWriter.java:185)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.compress.CompressedSequentialWriter.access$100(CompressedSequentialWriter.java:38)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.compress.CompressedSequentialWriter$TransactionalProxy.doPrepare(CompressedSequentialWriter.java:307)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit(Transactional.java:173)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io.util.SequentialWriter.prepareToCommit(SequentialWriter.java:358)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.sstable.format.big.BigTableWriter$TransactionalProxy.doPrepare(BigTableWriter.java:367)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit(Transactional.java:173)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.sstable.format.SSTableWriter.prepareToCommit(SSTableWriter.java:281)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io<http://org.apache.cassandra.io>.sstable.SimpleSSTableMultiWriter.prepareToCommit(SimpleSSTableMultiWriter.java:101)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.db.ColumnFamilyStore$Flush.flushMemtable(ColumnFamilyStore.java:1153)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1086)
~[apache-cassandra-3.10.jar:3.10]
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
~[na:1.8.0_121]
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[na:1.8.0_121]
    at
org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:79)
[apache-cassandra-3.10.jar:3.10]
    at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
Caused by: java.io.IOException: Input/output error
    at sun.nio.ch.FileDispatcherImpl.force0(Native Method) ~[na:1.8.0_121]
    at sun.nio.ch.FileDispatcherImpl.force(FileDispatcherImpl.java:76)
~[na:1.8.0_121]
    at sun.nio.ch.FileChannelImpl.force(FileChannelImpl.java:388)
~[na:1.8.0_121]
    at org.apache.cassandra.utils.SyncUtil.force(SyncUtil.java:158)
~[apache-cassandra-3.10.jar:3.10]
    at
org.apache.cassandra.io.util.SequentialWriter.syncDataOnlyInternal(SequentialWriter.java:169)
~[apache-cassandra-3.10.jar:3.10]
    ... 15 common frames omitted
INFO  [main] 2017-04-06 07:11:57,289 YamlConfigurationLoader.java:89 -
Configuration location: file:/etc/cassandra/cassandra.yaml


Some ERRORs messages:

ERROR [MemtablePostFlush:2] 2017-04-05 23:35:46,339
CassandraDaemon.java:229 - Exception in thread
Thread[MemtablePostFlush:2,5,main]
ERROR [MemtablePostFlush:3] 2017-04-05 23:44:08,471
CassandraDaemon.java:229 - Exception in thread
Thread[MemtablePostFlush:3,5,main]
ERROR [MemtablePostFlush:4] 2017-04-05 23:54:41,224
CassandraDaemon.java:229 - Exception in thread
Thread[MemtablePostFlush:4,5,main]
ERROR [MessagingService-Incoming-/10.0.120.52<http://10.0.120.52>] 2017-04-06 03:19:13,453
CassandraDaemon.java:229 - Exception in thread
Thread[MessagingService-Incoming-/10.0.120.52<http://10.0.120.52>,5,main]
ERROR [epollEventLoopGroup-2-6] 2017-04-06 03:24:41,006
CassandraDaemon.java:229 - Exception in thread
Thread[epollEventLoopGroup-2-6,10,main]
ERROR [Native-Transport-Requests-36] 2017-04-06 03:25:45,915
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-49] 2017-04-06 03:25:45,915
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [IndexSummaryManager:1] 2017-04-06 03:25:45,915
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-69] 2017-04-06 03:25:45,916
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-46] 2017-04-06 03:26:18,465
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [SharedPool-Worker-136] 2017-04-06 03:26:18,465
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-156] 2017-04-06 03:26:18,465
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [SharedPool-Worker-92] 2017-04-06 03:26:24,696
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-48] 2017-04-06 03:26:24,696 ?:? - JVM
state determined to be unstable.  Exiting forcefully due to:
ERROR [Native-Transport-Requests-66] 2017-04-06 03:26:55,808
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-77] 2017-04-06 03:26:55,808
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [GossipTasks:1] 2017-04-06 03:26:55,808
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-133] 2017-04-06 03:26:55,808
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-135] 2017-04-06 03:26:55,808
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [ScheduledFastTasks:1] 2017-04-06 03:26:55,808
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-70] 2017-04-06 03:27:11,569
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [IndexSummaryManager:1] 2017-04-06 03:27:17,821
CassandraDaemon.java:229 - Exception in thread
Thread[IndexSummaryManager:1,1,main]
ERROR [Native-Transport-Requests-103] 2017-04-06 03:27:24,049
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-69] 2017-04-06 03:27:24,049
SEPWorker.java:145 - Failed to execute task, unexpected exception killed
worker: {}
ERROR [SharedPool-Worker-98] 2017-04-06 03:27:24,049
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [MessagingService-Incoming-/10.0.120.52<http://10.0.120.52>] 2017-04-06 03:27:55,079
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [epollEventLoopGroup-2-5] 2017-04-06 03:27:55,079
JVMStabilityInspector.java:142 - JVM state determined to be unstable.
Exiting forcefully due to:
ERROR [Native-Transport-Requests-64] 2017-04-06 03:28:43,285
SEPWorker.java:145 - Failed to execute task, unexpected exception killed
worker: {}
ERROR [MemtablePostFlush:22] 2017-04-06 06:00:26,800
CassandraDaemon.java:229 - Exception in thread
Thread[MemtablePostFlush:22,5,main]
ERROR [MemtablePostFlush:31] 2017-04-06 06:39:19,525
CassandraDaemon.java:229 - Exception in thread
Thread[MemtablePostFlush:31,5,main]

Also some WARNs:

WARN  [main] 2017-04-06 09:26:49,725 CLibrary.java:178 - Unable to lock
JVM memory (ENOMEM). This can result in part of the JVM being swapped
out, especially with mmapped I/O enabled. Increase RLIMIT_MEMLOCK or run
Cassandra as root.

WARN  [main] 2017-04-06 09:25:07,355 StartupChecks.java:157 - JMX is not
enabled to receive remote connections. Please see cassandra-env.sh for
more info.

WARN  [main] 2017-04-06 09:25:07,369 SigarLibrary.java:174 - Cassandra
server running in degraded mode. Is swap disabled? : true,  Address
space adequate? : true,  nofile limit adequate? : false, nproc limit
adequate? : true

WARN  [main] 2017-04-06 09:25:07,091 DatabaseDescriptor.java:493 - Small
cdc volume detected at /var/lib/cassandra/cdc_raw; setting
cdc_total_space_in_mb to 2502.  You can override this in cassandra.yaml






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