Unprocessed messages is constantly increasing

hi, " unprocessed messages " on my server is constantly increasing. Also, “process buffer” and “output buffer” are always 100%.
My server has 8 cores and 21 gb ram. I write my confic below. Where am I making mistakes?

is_master = true

node_id_file = /etc/graylog/server/node-id

password_secret = 

bin_dir = /usr/share/graylog-server/bin

data_dir = /var/lib/graylog-server

plugin_dir = /usr/share/graylog-server/plugin
http_bind_address = 0.0.0.0:9000
# Maximum amount of time to wait for reading back a response from an Elasticsearch server.
#
# Default: 60 seconds
#elasticsearch_socket_timeout = 60s

# Maximum idle time for an Elasticsearch connection. If this is exceeded, this connection will
# be tore down.
#
# Default: inf
#elasticsearch_idle_timeout = -1s

# Maximum number of total connections to Elasticsearch.
#
# Default: 20
#elasticsearch_max_total_connections = 20

# Maximum number of total connections per Elasticsearch route (normally this means per
# elasticsearch server).
#
# Default: 2
#elasticsearch_max_total_connections_per_route = 2

# Maximum number of times Graylog will retry failed requests to Elasticsearch.
#
# Default: 2
#elasticsearch_max_retries = 2

# Enable automatic Elasticsearch node discovery through Nodes Info,
# see https://www.elastic.co/guide/en/elasticsearch/reference/5.4/cluster-nodes-info.html
#
# WARNING: Automatic node discovery does not work if Elasticsearch requires authentication, e. g. with Shield.
#
# Default: false
#elasticsearch_discovery_enabled = true

# Filter for including/excluding Elasticsearch nodes in discovery according to their custom attributes,
# see https://www.elastic.co/guide/en/elasticsearch/reference/5.4/cluster.html#cluster-nodes
#
# Default: empty
#elasticsearch_discovery_filter = rack:42

# Frequency of the Elasticsearch node discovery.
#
# Default: 30s
# elasticsearch_discovery_frequency = 30s

# Enable payload compression for Elasticsearch requests.
#
# Default: false
#elasticsearch_compression_enabled = true

# Graylog will use multiple indices to store documents in. You can configured the strategy it uses to determine
# when to rotate the currently active write index.
# It supports multiple rotation strategies:
#   - "count" of messages per index, use elasticsearch_max_docs_per_index below to configure
#   - "size" per index, use elasticsearch_max_size_per_index below to configure
# valid values are "count", "size" and "time", default is "count"
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
rotation_strategy = count

# (Approximate) maximum number of documents in an Elasticsearch index before a new index
# is being created, also see no_retention and elasticsearch_max_number_of_indices.
# Configure this if you used 'rotation_strategy = count' above.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
elasticsearch_max_docs_per_index = 20000000

# (Approximate) maximum size in bytes per Elasticsearch index on disk before a new index is being created, also see
# no_retention and elasticsearch_max_number_of_indices. Default is 1GB.
# Configure this if you used 'rotation_strategy = size' above.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
#elasticsearch_max_size_per_index = 1073741824

# (Approximate) maximum time before a new Elasticsearch index is being created, also see
# no_retention and elasticsearch_max_number_of_indices. Default is 1 day.
# Configure this if you used 'rotation_strategy = time' above.
# Please note that this rotation period does not look at the time specified in the received messages, but is
# using the real clock value to decide when to rotate the index!
# Specify the time using a duration and a suffix indicating which unit you want:
#  1w  = 1 week
#  1d  = 1 day
#  12h = 12 hours
# Permitted suffixes are: d for day, h for hour, m for minute, s for second.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
#elasticsearch_max_time_per_index = 1d

# Disable checking the version of Elasticsearch for being compatible with this Graylog release.
# WARNING: Using Graylog with unsupported and untested versions of Elasticsearch may lead to data loss!
#elasticsearch_disable_version_check = true

# Disable message retention on this node, i. e. disable Elasticsearch index rotation.
#no_retention = false

# How many indices do you want to keep?
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
elasticsearch_max_number_of_indices = 20

# Decide what happens with the oldest indices when the maximum number of indices is reached.
# The following strategies are availble:
#   - delete # Deletes the index completely (Default)
#   - close # Closes the index and hides it from the system. Can be re-opened later.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
retention_strategy = delete

# How many Elasticsearch shards and replicas should be used per index? Note that this only applies to newly created indices.
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
elasticsearch_shards = 4
elasticsearch_replicas = 0

# Prefix for all Elasticsearch indices and index aliases managed by Graylog.
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
elasticsearch_index_prefix = graylog

# Name of the Elasticsearch index template used by Graylog to apply the mandatory index mapping.
# Default: graylog-internal
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
#elasticsearch_template_name = graylog-internal

# Do you want to allow searches with leading wildcards? This can be extremely resource hungry and should only
# be enabled with care. See also: http://docs.graylog.org/en/2.1/pages/queries.html
allow_leading_wildcard_searches = false

# Do you want to allow searches to be highlighted? Depending on the size of your messages this can be memory hungry and
# should only be enabled after making sure your Elasticsearch cluster has enough memory.
allow_highlighting = false

# Analyzer (tokenizer) to use for message and full_message field. The "standard" filter usually is a good idea.
# All supported analyzers are: standard, simple, whitespace, stop, keyword, pattern, language, snowball, custom
# Elasticsearch documentation: https://www.elastic.co/guide/en/elasticsearch/reference/2.3/analysis.html
# Note that this setting only takes effect on newly created indices.
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#            This configuration setting is only used on the first start of Graylog. After that,
#            index related settings can be changed in the Graylog web interface on the 'System / Indices' page.
#            Also see http://docs.graylog.org/en/2.3/pages/configuration/index_model.html#index-set-configuration.
elasticsearch_analyzer = standard

# Global request timeout for Elasticsearch requests (e. g. during search, index creation, or index time-range
# calculations) based on a best-effort to restrict the runtime of Elasticsearch operations.
# Default: 1m
#elasticsearch_request_timeout = 1m

# Global timeout for index optimization (force merge) requests.
# Default: 1h
#elasticsearch_index_optimization_timeout = 1h

# Maximum number of concurrently running index optimization (force merge) jobs.
# If you are using lots of different index sets, you might want to increase that number.
# Default: 20
#elasticsearch_index_optimization_jobs = 20

# Time interval for index range information cleanups. This setting defines how often stale index range information
# is being purged from the database.
# Default: 1h
#index_ranges_cleanup_interval = 1h

# Time interval for the job that runs index field type maintenance tasks like cleaning up stale entries. This doesn't
# need to run very often.
# Default: 1h
#index_field_type_periodical_interval = 1h

# Batch size for the Elasticsearch output. This is the maximum (!) number of messages the Elasticsearch output
# module will get at once and write to Elasticsearch in a batch call. If the configured batch size has not been
# reached within output_flush_interval seconds, everything that is available will be flushed at once. Remember
# that every outputbuffer processor manages its own batch and performs its own batch write calls.
# ("outputbuffer_processors" variable)
output_batch_size = 500

# Flush interval (in seconds) for the Elasticsearch output. This is the maximum amount of time between two
# batches of messages written to Elasticsearch. It is only effective at all if your minimum number of messages
# for this time period is less than output_batch_size * outputbuffer_processors.
output_flush_interval = 1

# As stream outputs are loaded only on demand, an output which is failing to initialize will be tried over and
# over again. To prevent this, the following configuration options define after how many faults an output will
# not be tried again for an also configurable amount of seconds.
output_fault_count_threshold = 5
output_fault_penalty_seconds = 30

# The number of parallel running processors.
# Raise this number if your buffers are filling up.
processbuffer_processors = 5
outputbuffer_processors = 3

# The following settings (outputbuffer_processor_*) configure the thread pools backing each output buffer processor.
# See https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html for technical details

# When the number of threads is greater than the core (see outputbuffer_processor_threads_core_pool_size),
# this is the maximum time in milliseconds that excess idle threads will wait for new tasks before terminating.
# Default: 5000
#outputbuffer_processor_keep_alive_time = 5000

# The number of threads to keep in the pool, even if they are idle, unless allowCoreThreadTimeOut is set
# Default: 3
#outputbuffer_processor_threads_core_pool_size = 3

# The maximum number of threads to allow in the pool
# Default: 30
#outputbuffer_processor_threads_max_pool_size = 30

# UDP receive buffer size for all message inputs (e. g. SyslogUDPInput).
#udp_recvbuffer_sizes = 1048576

# Wait strategy describing how buffer processors wait on a cursor sequence. (default: sleeping)
# Possible types:
#  - yielding
#     Compromise between performance and CPU usage.
#  - sleeping
#     Compromise between performance and CPU usage. Latency spikes can occur after quiet periods.
#  - blocking
#     High throughput, low latency, higher CPU usage.
#  - busy_spinning
#     Avoids syscalls which could introduce latency jitter. Best when threads can be bound to specific CPU cores.
processor_wait_strategy = blocking

# Size of internal ring buffers. Raise this if raising outputbuffer_processors does not help anymore.
# For optimum performance your LogMessage objects in the ring buffer should fit in your CPU L3 cache.
# Must be a power of 2. (512, 1024, 2048, ...)
ring_size = 65536

inputbuffer_ring_size = 65536
inputbuffer_processors = 2
inputbuffer_wait_strategy = blocking

# Enable the disk based message journal.
message_journal_enabled = true

# The directory which will be used to store the message journal. The directory must me exclusively used by Graylog and
# must not contain any other files than the ones created by Graylog itself.
#
# ATTENTION:
#   If you create a seperate partition for the journal files and use a file system creating directories like 'lost+found'
#   in the root directory, you need to create a sub directory for your journal.
#   Otherwise Graylog will log an error message that the journal is corrupt and Graylog will not start.
message_journal_dir = /var/lib/graylog-server/journal

# Journal hold messages before they could be written to Elasticsearch.
# For a maximum of 12 hours or 5 GB whichever happens first.
# During normal operation the journal will be smaller.
#message_journal_max_age = 12h
#message_journal_max_size = 5gb

#message_journal_flush_age = 1m
#message_journal_flush_interval = 1000000
#message_journal_segment_age = 1h
#message_journal_segment_size = 100mb

# Number of threads used exclusively for dispatching internal events. Default is 2.
#async_eventbus_processors = 2

# How many seconds to wait between marking node as DEAD for possible load balancers and starting the actual
# shutdown process. Set to 0 if you have no status checking load balancers in front.
lb_recognition_period_seconds = 3

# Journal usage percentage that triggers requesting throttling for this server node from load balancers. The feature is
# disabled if not set.
#lb_throttle_threshold_percentage = 95

# Every message is matched against the configured streams and it can happen that a stream contains rules which
# take an unusual amount of time to run, for example if its using regular expressions that perform excessive backtracking.
# This will impact the processing of the entire server. To keep such misbehaving stream rules from impacting other
# streams, Graylog limits the execution time for each stream.
# The default values are noted below, the timeout is in milliseconds.
# If the stream matching for one stream took longer than the timeout value, and this happened more than "max_faults" times
# that stream is disabled and a notification is shown in the web interface.
#stream_processing_timeout = 2000
#stream_processing_max_faults = 3

# Length of the interval in seconds in which the alert conditions for all streams should be checked
# and alarms are being sent.
#alert_check_interval = 60

# Since 0.21 the Graylog server supports pluggable output modules. This means a single message can be written to multiple
# outputs. The next setting defines the timeout for a single output module, including the default output module where all
# messages end up.
#
# Time in milliseconds to wait for all message outputs to finish writing a single message.
#output_module_timeout = 10000

# Time in milliseconds after which a detected stale master node is being rechecked on startup.
#stale_master_timeout = 2000

# Time in milliseconds which Graylog is waiting for all threads to stop on shutdown.
#shutdown_timeout = 30000

# MongoDB connection string
# See https://docs.mongodb.com/manual/reference/connection-string/ for details
mongodb_uri = mongodb://localhost/graylog

# Authenticate against the MongoDB server
# '+'-signs in the username or password need to be replaced by '%2B'
#mongodb_uri = mongodb://grayloguser:secret@localhost:27017/graylog

# Use a replica set instead of a single host
#mongodb_uri = mongodb://grayloguser:secret@localhost:27017,localhost:27018,localhost:27019/graylog

# Increase this value according to the maximum connections your MongoDB server can handle from a single client
# if you encounter MongoDB connection problems.
mongodb_max_connections = 1000

# Number of threads allowed to be blocked by MongoDB connections multiplier. Default: 5
# If mongodb_max_connections is 100, and mongodb_threads_allowed_to_block_multiplier is 5,
# then 500 threads can block. More than that and an exception will be thrown.
# http://api.mongodb.com/java/current/com/mongodb/MongoOptions.html#threadsAllowedToBlockForConnectionMultiplier
mongodb_threads_allowed_to_block_multiplier = 5

ully qualified base url to your web interface exactly the same way as it is accessed by your users.
transport_email_web_interface_url = http://192.168.0.44:9000/


/etc/default/graylog-server

> # Path to the java executable.
> JAVA=/usr/bin/java
> 
> # Default Java options for heap and garbage collection.
> GRAYLOG_SERVER_JAVA_OPTS="-Xms1g -Xmx4g -XX:NewRatio=1 -server -XX:+ResizeTLAB -XX:+UseConcMarkSweepGC -XX:+CMSConcurrentMTEnabled -XX:+CMSClassUnloadingEnabled -XX:+UseParNewGC -XX:-OmitStackTraceInFastThrow"
> 
> # Pass some extra args to graylog-server. (i.e. "-d" to enable debug mode)
> GRAYLOG_SERVER_ARGS=""
> 
> # Program that will be used to wrap the graylog-server command. Useful to
> # support programs like authbind.
> GRAYLOG_COMMAND_WRAPPER=""

/etc/default/elasticsearch

> 
> ################################
> # Elasticsearch
> ################################
> 
> # Elasticsearch home directory
> #ES_HOME=/usr/share/elasticsearch
> 
> # Elasticsearch Java path
> #JAVA_HOME=
> 
> # Elasticsearch configuration directory
> ES_PATH_CONF=/etc/elasticsearch
> 
> # Elasticsearch PID directory
> #PID_DIR=/var/run/elasticsearch
> 
> # Additional Java OPTS
> #ES_JAVA_OPTS=
> 
> # Configure restart on package upgrade (true, every other setting will lead to not restarting)
> #RESTART_ON_UPGRADE=true
> 
> ################################
> # Elasticsearch service
> ################################
> 
> # SysV init.d
> #
> # The number of seconds to wait before checking if Elasticsearch started successfully as a daemon process
> ES_STARTUP_SLEEP_TIME=5
> 
> ################################
> # System properties
> ################################
> 
> # Specifies the maximum file descriptor number that can be opened by this process
> # When using Systemd, this setting is ignored and the LimitNOFILE defined in
> # /usr/lib/systemd/system/elasticsearch.service takes precedence
> #MAX_OPEN_FILES=65535
> 
> # The maximum number of bytes of memory that may be locked into RAM
> # Set to "unlimited" if you use the 'bootstrap.memory_lock: true' option
> # in elasticsearch.yml.
> # When using systemd, LimitMEMLOCK must be set in a unit file such as
> # /etc/systemd/system/elasticsearch.service.d/override.conf.
> #MAX_LOCKED_MEMORY=unlimited
> 
> # Maximum number of VMA (Virtual Memory Areas) a process can own
> # When using Systemd, this setting is ignored and the 'vm.max_map_count'
> # property is set at boot time in /usr/lib/sysctl.d/elasticsearch.conf
> #MAX_MAP_COUNT=262144

Read through this thread for some possibilities - in short some people are seeing malformed GROK lock up processing. This may or may not be the issue but it might be a reasonable place to look…

Unfortunately. I couldn’t find a solution. unprocessed messages is now 16.xxx.xxx.xxx :frowning:,

Looks like Elasticsearch isn’t receiving - Anything interesting in the logs on Graylog or in Elasticseatch? Any recent changes? have you restarted graylog or elasticsearch ?

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