This is a bit confusing. But reading the configs and logs, I'm not able to understand why the log was deleted at such time point.
topic 1_persistent was created on 3rd Oct.
A new log segment was rolled once the log size reached above 1 GB on 5th Oct:
[2015-10-05 11:55:08,329] INFO Rolled new log segment for '1_persistent-0' in 31 ms. (kafka.log.Log)
However, log shows that the first log segment for 1_persistent got deleted after 4 days (7th Oct).
Can anyone help me understand why? Thank you.
[server.properties]
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# see kafka.server.KafkaConfig for additional details and defaults
############################# Server Basics #############################
# The id of the broker. This must be set to a unique integer for each broker.
broker.id=2041775
############################# Socket Server Settings #############################
listeners=PLAINTEXT://:9092
# The port the socket server listens on
#port=9092
# Hostname the broker will bind to. If not set, the server will bind to all interfaces
host.name=10.204.177.5
# Hostname the broker will advertise to producers and consumers. If not set, it uses the
# value for "host.name" if configured. Otherwise, it will use the value returned from
# java.net.InetAddress.getCanonicalHostName().
advertised.host.name=10.204.177.5
# The port to publish to ZooKeeper for clients to use. If this is not set,
# it will publish the same port that the broker binds to.
advertised.port=9092
# The number of threads handling network requests
num.network.threads=3
# The number of threads doing disk I/O
num.io.threads=8
# The send buffer (SO_SNDBUF) used by the socket server
socket.send.buffer.bytes=102400
# The receive buffer (SO_RCVBUF) used by the socket server
socket.receive.buffer.bytes=102400
# The maximum size of a request that the socket server will accept (protection against OOM)
socket.request.max.bytes=104857600
############################# Log Basics #############################
# A comma seperated list of directories under which to store log files
log.dirs=/var/spool/backup/kafka_logs
# The default number of log partitions per topic. More partitions allow greater
# parallelism for consumption, but this will also result in more files across
# the brokers.
num.partitions=1
# The number of threads per data directory to be used for log recovery at startup and flushing at shutdown.
# This value is recommended to be increased for installations with data dirs located in RAID array.
num.recovery.threads.per.data.dir=1
############################# Log Flush Policy #############################
# Messages are immediately written to the filesystem but by default we only fsync() to sync
# the OS cache lazily. The following configurations control the flush of data to disk.
# There are a few important trade-offs here:
# 1. Durability: Unflushed data may be lost if you are not using replication.
# 2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush.
# 3. Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to exceessive seeks.
# The settings below allow one to configure the flush policy to flush data after a period of time or
# every N messages (or both). This can be done globally and overridden on a per-topic basis.
# The number of messages to accept before forcing a flush of data to disk
#log.flush.interval.messages=10000
# The maximum amount of time a message can sit in a log before we force a flush
#log.flush.interval.ms=1000
############################# Log Retention Policy #############################
# The following configurations control the disposal of log segments. The policy can
# be set to delete segments after a period of time, or after a given size has accumulated.
# A segment will be deleted whenever *either* of these criteria are met. Deletion always happens
# from the end of the log.
# The minimum age of a log file to be eligible for deletion
log.retention.hours=168
# A size-based retention policy for logs. Segments are pruned from the log as long as the remaining
# segments don't drop below log.retention.bytes.
#log.retention.bytes=1073741824
# The maximum size of a log segment file. When this size is reached a new log segment will be created.
log.segment.bytes=1073741824
# The interval at which log segments are checked to see if they can be deleted according
# to the retention policies
log.retention.check.interval.ms=300000
# By default the log cleaner is disabled and the log retention policy will default to just delete segments after their retention expires.
# If log.cleaner.enable=true is set the cleaner will be enabled and individual logs can then be marked for log compaction.
log.cleaner.enable=false
############################# Zookeeper #############################
# Zookeeper connection string (see zookeeper docs for details).
# This is a comma separated host:port pairs, each corresponding to a zk
# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
# You can also append an optional chroot string to the urls to specify the
# root directory for all kafka znodes.
zookeeper.connect=10.204.177.4:2181
# Timeout in ms for connecting to zookeeper
zookeeper.connection.timeout.ms=60000
delete.topic.enable=true
controlled.shutdown.enable=true
log.retention.bytes=1073741824
reserved.broker.max.id=2147483647
[Kafka log]
[2015-10-03 17:52:41,580] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent,0] (kafka.server.ReplicaFetcherManager)
[2015-10-03 17:52:41,626] INFO Completed load of log 1_persistent-0 with log end offset 0 (kafka.log.Log)
[2015-10-03 17:52:41,631] INFO Created log for partition [1_persistent,0] in /var/spool/backup/kafka_logs with properties {segment.index.bytes -> 10485760, file.delete.delay.ms -> 60000, segment.bytes -> 1073741824, flush.ms -> 9223372036854775807, delete.retention.ms -> 86400000, index.interval.bytes -> 4096, retention.bytes -> 1073741824, min.insync.replicas -> 1, cleanup.policy -> delete, unclean.leader.election.enable -> true, segment.ms -> 604800000, max.message.bytes -> 1000012, flush.messages -> 9223372036854775807, compression.type -> producer, min.cleanable.dirty.ratio -> 0.5, retention.ms -> 604800000, segment.jitter.ms -> 0}. (kafka.log.LogManager)
[2015-10-03 17:52:41,632] INFO Partition [1_persistent,0] on broker 2041775: No checkpointed highwatermark is found for partition [1_persistent,0] (kafka.cluster.Partition)
[2015-10-03 17:53:02,066] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent,0] (kafka.server.ReplicaFetcherManager)
[2015-10-03 17:53:02,271] INFO Partition [1_persistent,0] on broker 2041775: Expanding ISR for partition [1_persistent,0] from 2041775 to 2041775,2041776 (kafka.cluster.Partition)
[2015-10-03 17:53:02,307] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent,0] (kafka.server.ReplicaFetcherManager)
[2015-10-03 17:53:15,170] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent,0] (kafka.server.ReplicaFetcherManager)
[2015-10-03 17:57:43,288] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent,0] (kafka.server.ReplicaFetcherManager)
[2015-10-03 17:57:43,288] INFO Truncating log 1_persistent-0 to offset 689. (kafka.log.Log)
[2015-10-03 17:57:43,301] INFO [ReplicaFetcherManager on broker 2041775] Added fetcher for partitions List([[1_persistent,0], initOffset 689 to broker BrokerEndPoint(2041776,10.204.177.6,9092)] ) (kafka.server.ReplicaFetcherManager)
[2015-10-05 10:00:15,530] INFO [KafkaApi-2041775] Auto creation of topic 1_persistent_Temp with 1 partitions and replication factor 1 is successful! (kafka.server.KafkaApis)
[2015-10-05 10:00:15,831] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent_Temp,0] (kafka.server.ReplicaFetcherManager)
[2015-10-05 10:00:15,833] INFO Completed load of log 1_persistent_Temp-0 with log end offset 0 (kafka.log.Log)
[2015-10-05 10:00:15,834] INFO Created log for partition [1_persistent_Temp,0] in /var/spool/backup/kafka_logs with properties {segment.index.bytes -> 10485760, file.delete.delay.ms -> 60000, segment.bytes -> 1073741824, flush.ms -> 9223372036854775807, delete.retention.ms -> 86400000, index.interval.bytes -> 4096, retention.bytes -> 1073741824, min.insync.replicas -> 1, cleanup.policy -> delete, unclean.leader.election.enable -> true, segment.ms -> 604800000, max.message.bytes -> 1000012, flush.messages -> 9223372036854775807, compression.type -> producer, min.cleanable.dirty.ratio -> 0.5, retention.ms -> 604800000, segment.jitter.ms -> 0}. (kafka.log.LogManager)
[2015-10-05 10:00:15,836] INFO Partition [1_persistent_Temp,0] on broker 2041775: No checkpointed highwatermark is found for partition [1_persistent_Temp,0] (kafka.cluster.Partition)
[2015-10-05 10:00:22,016] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent_Temp,0] (kafka.server.ReplicaFetcherManager)
[2015-10-05 10:00:22,301] INFO Partition [1_persistent_Temp,0] on broker 2041775: Expanding ISR for partition [1_persistent_Temp,0] from 2041775 to 2041775,2041776 (kafka.cluster.Partition)
[2015-10-05 10:00:22,307] INFO [ReplicaFetcherManager on broker 2041775] Removed fetcher for partitions [1_persistent_Temp,0] (kafka.server.ReplicaFetcherManager)
[2015-10-05 11:55:08,329] INFO Rolled new log segment for '1_persistent-0' in 31 ms. (kafka.log.Log)
[2015-10-07 09:59:22,150] INFO Rolled new log segment for '1_persistent-0' in 9 ms. (kafka.log.Log)
[2015-10-07 10:03:08,055] INFO Scheduling log segment 0 for log 1_persistent-0 for deletion. (kafka.log.Log)
[2015-10-07 10:04:08,067] INFO Deleting segment 0 from log 1_persistent-0. (kafka.log.Log)
[2015-10-07 10:04:09,073] INFO Deleting index /var/spool/backup/kafka_logs/1_persistent-0/00000000000000000000.index.deleted (kafka.log.OffsetIndex)
