bookkeeper-server/conf/bk_server.conf

#!/bin/sh
#
#/**
# * Copyright 2007 The Apache Software Foundation
# *
# * 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.
# */

## Bookie settings

# Port that bookie server listen on
bookiePort=3181

# Set the network interface that the bookie should listen on.
# If not set, the bookie will listen on all interfaces.
#listeningInterface=eth0

# Whether the bookie allowed to use a loopback interface as its primary
# interface(i.e. the interface it uses to establish its identity)?
# By default, loopback interfaces are not allowed as the primary
# interface.
# Using a loopback interface as the primary interface usually indicates
# a configuration error. For example, its fairly common in some VPS setups
# to not configure a hostname, or to have the hostname resolve to
# 127.0.0.1. If this is the case, then all bookies in the cluster will
# establish their identities as 127.0.0.1:3181, and only one will be able
# to join the cluster. For VPSs configured like this, you should explicitly
# set the listening interface.
#allowLoopback=false

# Directory Bookkeeper outputs its write ahead log
journalDirectory=/tmp/bk-txn

# Directory Bookkeeper outputs ledger snapshots
# could define multi directories to store snapshots, separated by ','
# For example:
# ledgerDirectories=/tmp/bk1-data,/tmp/bk2-data
# 
# Ideally ledger dirs and journal dir are each in a differet device,
# which reduce the contention between random i/o and sequential write.
# It is possible to run with a single disk, but performance will be significantly lower.
ledgerDirectories=/tmp/bk-data

# Ledger Manager Class
# What kind of ledger manager is used to manage how ledgers are stored, managed
# and garbage collected. Try to read 'BookKeeper Internals' for detail info.
# ledgerManagerType=flat

# Root zookeeper path to store ledger metadata
# This parameter is used by zookeeper-based ledger manager as a root znode to
# store all ledgers.
# zkLedgersRootPath=/ledgers

# Max file size of entry logger, in bytes
# A new entry log file will be created when the old one reaches the file size limitation
# logSizeLimit=2147483648

# Threshold of minor compaction
# For those entry log files whose remaining size percentage reaches below
# this threshold will be compacted in a minor compaction.
# If it is set to less than zero, the minor compaction is disabled.
# minorCompactionThreshold=0.2

# Interval to run minor compaction, in seconds
# If it is set to less than zero, the minor compaction is disabled. 
# minorCompactionInterval=3600

# Threshold of major compaction
# For those entry log files whose remaining size percentage reaches below
# this threshold will be compacted in a major compaction.
# Those entry log files whose remaining size percentage is still
# higher than the threshold will never be compacted.
# If it is set to less than zero, the minor compaction is disabled.
# majorCompactionThreshold=0.8

# Interval to run major compaction, in seconds
# If it is set to less than zero, the major compaction is disabled. 
# majorCompactionInterval=86400 

# Set the maximum number of entries which can be compacted without flushing.
# When compacting, the entries are written to the entrylog and the new offsets
# are cached in memory. Once the entrylog is flushed the index is updated with
# the new offsets. This parameter controls the number of entries added to the
# entrylog before a flush is forced. A higher value for this parameter means
# more memory will be used for offsets. Each offset consists of 3 longs.
# This parameter should _not_ be modified unless you know what you're doing.
# The default is 100,000.
#compactionMaxOutstandingRequests=100000

# Set the rate at which compaction will readd entries. The unit is adds per second.
#compactionRate=1000

# Max file size of journal file, in mega bytes
# A new journal file will be created when the old one reaches the file size limitation
#
# journalMaxSizeMB=2048

# Max number of old journal file to kept
# Keep a number of old journal files would help data recovery in specia case
#
# journalMaxBackups=5

# How long the interval to trigger next garbage collection, in milliseconds
# Since garbage collection is running in background, too frequent gc
# will heart performance. It is better to give a higher number of gc
# interval if there is enough disk capacity.
# gcWaitTime=1000

# How long the interval to flush ledger index pages to disk, in milliseconds
# Flushing index files will introduce much random disk I/O.
# If separating journal dir and ledger dirs each on different devices,
# flushing would not affect performance. But if putting journal dir
# and ledger dirs on same device, performance degrade significantly
# on too frequent flushing. You can consider increment flush interval
# to get better performance, but you need to pay more time on bookie
# server restart after failure.
#
# flushInterval=100

# Interval to watch whether bookie is dead or not, in milliseconds
#
# bookieDeathWatchInterval=1000

## zookeeper client settings

# A list of one of more servers on which zookeeper is running.
# The server list can be comma separated values, for example:
# zkServers=zk1:2181,zk2:2181,zk3:2181
zkServers=localhost:2181
# ZooKeeper client session timeout in milliseconds
# Bookie server will exit if it received SESSION_EXPIRED because it
# was partitioned off from ZooKeeper for more than the session timeout
# JVM garbage collection, disk I/O will cause SESSION_EXPIRED.
# Increment this value could help avoiding this issue
zkTimeout=10000

## NIO Server settings

# This settings is used to enabled/disabled Nagle's algorithm, which is a means of
# improving the efficiency of TCP/IP networks by reducing the number of packets
# that need to be sent over the network.
# If you are sending many small messages, such that more than one can fit in
# a single IP packet, setting server.tcpnodelay to false to enable Nagle algorithm
# can provide better performance.
# Default value is true.
#
# serverTcpNoDelay=true

## ledger cache settings

# Max number of ledger index files could be opened in bookie server
# If number of ledger index files reaches this limitation, bookie
# server started to swap some ledgers from memory to disk.
# Too frequent swap will affect performance. You can tune this number
# to gain performance according your requirements.
# openFileLimit=900

# Size of a index page in ledger cache, in bytes
# A larger index page can improve performance writing page to disk,
# which is efficent when you have small number of ledgers and these
# ledgers have similar number of entries.
# If you have large number of ledgers and each ledger has fewer entries,
# smaller index page would improve memory usage.
# pageSize=8192

# How many index pages provided in ledger cache
# If number of index pages reaches this limitation, bookie server
# starts to swap some ledgers from memory to disk. You can increment
# this value when you found swap became more frequent. But make sure
# pageLimit*pageSize should not more than JVM max memory limitation,
# otherwise you would got OutOfMemoryException.
# In general, incrementing pageLimit, using smaller index page would
# gain bettern performance in lager number of ledgers with fewer entries case
# If pageLimit is -1, bookie server will use 1/3 of JVM memory to compute
# the limitation of number of index pages.
# pageLimit=-1

#If all ledger directories configured are full, then support only read requests for clients.
#If "readOnlyModeEnabled=true" then on all ledger disks full, bookie will be converted
#to read-only mode and serve only read requests. Otherwise the bookie will be shutdown.
#By default this will be disabled.
#readOnlyModeEnabled=false

#For each ledger dir, maximum disk space which can be used.
#Default is 0.95f. i.e. 95% of disk can be used at most after which nothing will
#be written to that partition. If all ledger dir partions are full, then bookie
#will turn to readonly mode if 'readOnlyModeEnabled=true' is set, else it will
#shutdown.
#Valid values should be in between 0 and 1 (exclusive). 
#diskUsageThreshold=0.95

#Disk check interval in milli seconds, interval to check the ledger dirs usage.
#Default is 10000
#diskCheckInterval=10000

# Interval at which the auditor will do a check of all ledgers in the cluster.
# By default this runs once a week. The interval is set in seconds.
# To disable the periodic check completely, set this to 0.
# Note that periodic checking will put extra load on the cluster, so it should
# not be run more frequently than once a day.
#auditorPeriodicCheckInterval=604800

# The interval between auditor bookie checks.
# The auditor bookie check, checks ledger metadata to see which bookies should
# contain entries for each ledger. If a bookie which should contain entries is
# unavailable, then the ledger containing that entry is marked for recovery.
# Setting this to 0 disabled the periodic check. Bookie checks will still
# run when a bookie fails.
# The interval is specified in seconds.
#auditorPeriodicBookieCheckInterval=86400