org.apache.cassandra.service

Class StartupChecks

java.lang.Object

org.apache.cassandra.service.StartupChecks

public class StartupChecks
extends java.lang.Object

Verifies that the system and environment is in a fit state to be started. Used in CassandraDaemon#setup() to check various settings and invariants. Each individual test is modelled as an implementation of StartupCheck, these are run at the start of CassandraDaemon#setup() before any local state is mutated. The default checks are a mix of informational tests (inspectJvmOptions), initialization (initSigarLibrary, checkCacheServiceInitialization) and invariant checking (checkValidLaunchDate, checkSystemKeyspaceState, checkSSTablesFormat). In addition, if checkSystemKeyspaceState determines that the release version has changed since last startup (i.e. the node has been upgraded) it snapshots the system keyspace to make it easier to back out if necessary. If any check reports a failure, then the setup method exits with an error (after logging any output from the tests). If all tests report success, setup can continue. We should be careful in future to ensure anything which mutates local state (such as writing new sstables etc) only happens after we've verified the initial setup.

Field Summary

Fields

Modifier and Type	Field and Description
static StartupCheck	checkDatacenter
static StartupCheck	checkDataDirs
static StartupCheck	checkJemalloc
static StartupCheck	checkJMXPorts
static StartupCheck	checkJnaInitialization
static StartupCheck	checkRack
static StartupCheck	checkSSTablesFormat
static StartupCheck	checkSystemKeyspaceState
static StartupCheck	checkValidLaunchDate
static StartupCheck	initSigarLibrary
static StartupCheck	inspectJvmOptions

Constructor Summary

Constructors

Constructor and Description
StartupChecks()

Method Summary

Modifier and Type	Method and Description
void	verify() Run the configured tests and return a report detailing the results.
StartupChecks	withDefaultTests()
StartupChecks	withTest(StartupCheck test) Add system test to be run before schema is loaded during startup

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

checkJemalloc

public static final StartupCheck checkJemalloc

checkValidLaunchDate

public static final StartupCheck checkValidLaunchDate

checkJMXPorts

public static final StartupCheck checkJMXPorts

inspectJvmOptions

public static final StartupCheck inspectJvmOptions

checkJnaInitialization

public static final StartupCheck checkJnaInitialization

initSigarLibrary

public static final StartupCheck initSigarLibrary

checkDataDirs

public static final StartupCheck checkDataDirs

checkSSTablesFormat

public static final StartupCheck checkSSTablesFormat

checkSystemKeyspaceState

public static final StartupCheck checkSystemKeyspaceState

checkDatacenter

public static final StartupCheck checkDatacenter

checkRack

public static final StartupCheck checkRack

Constructor Detail

StartupChecks

public StartupChecks()

Method Detail

withDefaultTests

public StartupChecks withDefaultTests()

withTest

public StartupChecks withTest(StartupCheck test)

Add system test to be run before schema is loaded during startup

Parameters:

test - the system test to include

verify

public void verify()
            throws StartupException

Run the configured tests and return a report detailing the results.

Throws:

StartupException - if any test determines that the system is not in an valid state to startup