com.bigdata

Class BigdataStatics

java.lang.Object

com.bigdata.BigdataStatics

public class BigdataStatics
extends Object

A class for those few statics that it makes sense to reference from other places.

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	debug A flag used for a variety of purposes during performance tuning.
static int	echoProcessStartupLineCount The #of lines of output from a child process which will be echoed onto System.out when that child process is executed.
static String	HOSTNAME The name of an environment variable whose value will be used as the canonical host name for the host running this JVM.
static boolean	runKnownBadTests Used to ignore tests in CI that are known to fail.
static boolean	threadLocalBuffers Deprecated. This is ugly. Remove once the issue has been resolved.

Constructor Summary

Constructors

Constructor and Description
BigdataStatics()

Method Summary

Methods

Modifier and Type	Method and Description
static String	getContextPath() Return the web application context path for the default deployment of the bigdata web application.
static void	threadDump(Appendable w) Write a thread dump onto the caller's object.

Methods inherited from class java.lang.Object

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

Field Detail

debug

public static final boolean debug

A flag used for a variety of purposes during performance tuning. The use of the flag makes it easier to figure out where those System.err messages are coming from. This should always be off in the trunk.

HOSTNAME

public static final String HOSTNAME

The name of an environment variable whose value will be used as the canonical host name for the host running this JVM. This information is used by the AbstractStatisticsCollector, which is responsible for obtaining and reporting the canonical hostname for the Banner and other purposes.

See Also:

AbstractStatisticsCollector, Banner, GangliaService.HOSTNAME, Provide workaround for bad reverse DNS setups, Constant Field Values

echoProcessStartupLineCount

public static int echoProcessStartupLineCount

The #of lines of output from a child process which will be echoed onto System.out when that child process is executed. This makes it easy to track down why a child process dies during service start. If you want to see all output from the child process, then you should set the log level for the com.bigdata.jini.start.process.ProcessHelper class to INFO.

Note: This needs to be more than the length of the Banner output in order for anything related to the process behavior to be echoed on System.out.

See Also:

com.bigdata.jini.start.process.ProcessHelper

threadLocalBuffers

public static final boolean threadLocalBuffers

Deprecated. This is ugly. Remove once the issue has been resolved.

Global switch controlling whether true thread local buffers or striped locks are used for some things.

See Also:

(Thread-local cache combined with unbounded thread pools causes effective memory leak)

runKnownBadTests

public static final boolean runKnownBadTests

Used to ignore tests in CI that are known to fail. This helps make CI green for people while still leaving us a trail for the tests that exist to mark problems that should be fixed at some point.

Constructor Detail

BigdataStatics

public BigdataStatics()

Method Detail

getContextPath

public static final String getContextPath()

Return the web application context path for the default deployment of the bigdata web application.

See Also:

Allow configuration of embedded NSS jetty server using jetty-web.xml

threadDump

public static void threadDump(Appendable w)

Write a thread dump onto the caller's object.

Note: This code should not obtain any locks. This is necessary in order for the code to run even when the server is in a deadlock.

See Also:

Add ability to dump threads to status page