How To Run A Bookie Operation

This document is a guide to deploying, administering, and maintaining BookKeeper. It also discusses best practices and common problems.

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Requirements

A typical BookKeeper installation consists of an ensemble of bookies and a ZooKeeper quorum. The exact number of bookies depends on the quorum mode that you choose, desired throughput, and the number of clients using the installation simultaneously.

The minimum number of bookies depends on the type of installation:

• For self-verifying entries you should run at least three bookies. In this mode, clients store a message authentication code along with each entry.
• For generic entries you should run at least four

There is no upper limit on the number of bookies that you can run in a single ensemble.

Performance

To achieve optimal performance, BookKeeper requires each server to have at least two disks. It’s possible to run a bookie with a single disk but performance will be significantly degraded.

How To Run A Bookie Operations

ZooKeeper

There is no constraint on the number of ZooKeeper nodes you can run with BookKeeper. A single machine running ZooKeeper in standalone mode is sufficient for BookKeeper, although for the sake of higher resilience we recommend running ZooKeeper in quorum mode with multiple servers.

Starting and stopping bookies

You can run bookies either in the foreground or in the background, using nohup. You can also run local bookies for development purposes.

To start a bookie in the foreground, use the bookie command of the bookkeeper CLI tool:

To start a bookie in the background, use the bookkeeper-daemon.sh script and run start bookie:

Local bookies

The instructions above showed you how to run bookies intended for production use. If you’d like to experiment with ensembles of bookies locally, you can use the localbookie command of the bookkeeper CLI tool and specify the number of bookies you’d like to run.

This would spin up a local ensemble of 6 bookies:

When you run a local bookie ensemble, all bookies run in a single JVM process.

Configuring bookies

There’s a wide variety of parameters that you can set in the bookie configuration file in bookkeeper-server/conf/bk_server.conf of your BookKeeper installation. A full listing can be found in Bookie configuration.

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Some of the more important parameters to be aware of:

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Ideally, the directories specified journalDirectory and ledgerDirectories should be on difference devices.

Logging

BookKeeper uses slf4j for logging, with log4j bindings enabled by default.

To enable logging for a bookie, create a log4j.properties file and point the BOOKIE_LOG_CONF environment variable to the configuration file. Here’s an example:

Upgrading

From time to time you may need to make changes to the filesystem layout of bookies—changes that are incompatible with previous versions of BookKeeper and require that directories used with previous versions are upgraded. If a filesystem upgrade is required when updating BookKeeper, the bookie will fail to start and return an error like this:

BookKeeper provides a utility for upgrading the filesystem. You can perform an upgrade using the upgrade command of the bookkeeper CLI tool. When running bookkeeper upgrade you need to specify one of three flags:

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Upgrade pattern

A standard upgrade pattern is to run an upgrade…

…then check that everything is working normally, then kill the bookie. If everything is okay, finalize the upgrade…

…and then restart the server:

If something has gone wrong, you can always perform a rollback:

Formatting

You can format bookie metadata in ZooKeeper using the metaformat command of the BookKeeper shell.

By default, formatting is done in interactive mode, which prompts you to confirm the format operation if old data exists. You can disable confirmation using the -nonInteractive flag. If old data does exist, the format operation will abort unless you set the -force flag. Here’s an example:

You can format the local filesystem data on a bookie using the bookieformat command on each bookie. Here’s an example:

The -force and -nonInteractive flags are also available for the bookieformat command.

AutoRecovery

For a guide to AutoRecovery in BookKeeper, see this doc.

Missing disks or directories

Accidentally replacing disks or removing directories can cause a bookie to fail while trying to read a ledger fragment that, according to the ledger metadata, exists on the bookie. For this reason, when a bookie is started for the first time, its disk configuration is fixed for the lifetime of that bookie. Any change to its disk configuration, such as a crashed disk or an accidental configuration change, will result in the bookie being unable to start. That will throw an error like this:

If the change was the result of an accidental configuration change, the change can be reverted and the bookie can be restarted. However, if the change cannot be reverted, such as is the case when you want to add a new disk or replace a disk, the bookie must be wiped and then all its data re-replicated onto it.

1. Increment the bookiePort parameter in the bk_server.conf
2. Ensure that all directories specified by journalDirectory and ledgerDirectories are empty.
3. Start the bookie.

4. Run the following command to re-replicate the data:

   The ZooKeeper server, old bookie, and new bookie, are all identified by their external IP and bookiePort (3181 by default). Here’s an example:

   See the AutoRecovery documentation for more info on the re-replication process.