Examples of com.sleepycat.je.EnvironmentConfig

com.sleepycat.je.EnvironmentConfig

omize an environment configuration EnvironmentConfig envConfig = new EnvironmentConfig(); // will throw if timeout value is invalid envConfig.setLockTimeout(250, TimeUnit.MILLISECONDS); // Open the environment using this configuration. Environment myEnvironment = new Environment(home, envConfig);

Additional parameters are described by the parameter name String constants in this class. These additional parameters will not be needed by most applications. This category of properties can be specified for the EnvironmentConfig object through a Properties object read by EnvironmentConfig(Properties), or individually through EnvironmentConfig.setConfigParam().

For example, an application can change the default btree node size with:

 envConfig.setConfigParam(EnvironmentConfig.NODE_MAX_ENTRIES, "256");

Environment configuration follows this order of precedence:

Configuration parameters specified in <environment home>/je.properties take first precedence.
Configuration parameters set in the EnvironmentConfig object used at Environment construction are next.
Any configuration parameters not set by the application are set to system defaults, described along with the parameter name String constants in this class.

An EnvironmentConfig can be used to specify both mutable and immutable environment properties. Immutable properties may be specified when the first Environment handle (instance) is opened for a given physical environment. When more handles are opened for the same environment, the following rules apply:

Immutable properties must equal the original values specified when constructing an Environment handle for an already open environment. When a mismatch occurs, an exception is thrown.
Mutable properties are ignored when constructing an Environment handle for an already open environment.

After an Environment has been constructed, its mutable properties may be changed using {@link Environment#setMutableConfig}. See {@link EnvironmentMutableConfig} for a list of mutable properties; all otherproperties are immutable. Whether a property is mutable or immutable is also described along with the parameter name String constants in this class.

Getting the Current Environment Properties

To get the current "live" properties of an environment after constructing it or changing its properties, you must call {@link Environment#getConfig} or{@link Environment#getMutableConfig}. The original EnvironmentConfig or EnvironmentMutableConfig object used to set the properties is not kept up to date as properties are changed, and does not reflect property validation or properties that are computed.

Time Duration Properties

Several environment and transaction configuration properties are time durations. For these properties, a time unit is specified along with an integer duration value.

When specific setter and getter methods exist for a time duration property, these methods have a {@link TimeUnit} argument. Examples are{@link #setLockTimeout(long,TimeUnit)} and {@link #getLockTimeout(TimeUnit)}. Note that the {@link TimeUnit} argument maybe null only when the duration value is zero; there is no default unit that is used when null is specified.

When a time duration is specified as a string value, the following format is used.

    {@code  [   ]}

The {@code } is an integer. The {@code } name, if present,must be preceded by one or more spaces or tabs.

The following {@code } names are allowed. Both {@link TimeUnit}names and IEEE standard abbreviations are allowed. Unit names are case insensitive.

IEEE abbreviation	TimeUnit name	Definition
{@code ns}	{@code NANOSECONDS}	one billionth (10^-9) of a second
{@code us}	{@code MICROSECONDS}	one millionth (10^-6) of a second
{@code ms}	{@code MILLISECONDS}	one thousandth (10^-3) of a second
{@code s}	{@code SECONDS}	1 second
{@code min}		60 seconds
{@code h}		3600 seconds

Examples are:

 3 seconds 3 s 500 ms 1000000 (microseconds is implied)

Note that when the {@code } is omitted, microseconds is implied.This default is supported for compatibility with JE 3.3 and earlier. In JE 3.3 and earlier, explicit time units were not used and durations were always implicitly specified in microseconds. The older methods that do not have a {@link TimeUnit} argument, such as {@link #setLockTimeout(long)} and {@link #getLockTimeout()}, use microsecond durations and have been deprecated.

    File folder = new File(storageFolder);
    if (!folder.exists()) {
      folder.mkdirs();
    }


    EnvironmentConfig envConfig = new EnvironmentConfig();
    envConfig.setAllowCreate(true);
    envConfig.setTransactional(resumable);
    envConfig.setLocking(resumable);


    File envHome = new File(storageFolder + "/frontier");
    if (!envHome.exists()) {
      envHome.mkdir();
    }

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 {
  this.DBDIR = dirname;
  if (env != null) return false;
  try
  { 
   EnvironmentConfig econfig = new EnvironmentConfig(); 
   econfig.setAllowCreate(!readOnly); econfig.setReadOnly(readOnly);
   //econfig.setTransactional(true);
   env = new Environment( new File (dirname), econfig);


   //*-- initializes the database hash with the list of databases in the environment
   dbMap = new HashMap<String,Database>();

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                if (name.endsWith("jdb") || name.equals("je.lck"))
                    files[i].delete();
            }
        }


        EnvironmentConfig envConfig = new EnvironmentConfig();
        DatabaseConfig dbConfig = new DatabaseConfig();


        envConfig.setTransactional(true);
        envConfig.setAllowCreate(true);
        dbConfig.setAllowCreate(true);
        dbConfig.setTransactional(true);


        env = new Environment(dbHome, envConfig);

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        replicationConfig.setHelperHosts(_helperHostPort);
        replicationConfig.setDesignatedPrimary(_designatedPrimary);
        setReplicationConfigProperties(replicationConfig);


        final EnvironmentConfig envConfig = createEnvironmentConfig();
        envConfig.setDurability(_durability);


        ReplicatedEnvironment replicatedEnvironment = null;
        try
        {
            replicatedEnvironment = new ReplicatedEnvironment(environmentPath, replicationConfig, envConfig);

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                                                                        + "storeB").exists()));
    }


    @Test
    public void testUnsharedCache() throws DatabaseException {
        EnvironmentConfig environmentConfig = new EnvironmentConfig();
        environmentConfig.setDurability(Durability.COMMIT_NO_SYNC);
        environmentConfig.setAllowCreate(true);
        environmentConfig.setTransactional(true);
        environmentConfig.setSharedCache(false);
        environmentConfig.setCacheSize(CACHE_SIZE);


        DatabaseConfig databaseConfig = new DatabaseConfig();
        databaseConfig.setAllowCreate(true);
        databaseConfig.setTransactional(true);
        databaseConfig.setSortedDuplicates(true);

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        assertEquals("MaxCacheSize < 2 * CACHE_SIZE", true, maxCacheSize < 2 * CACHE_SIZE);
    }


    @Test
    public void testSharedCache() throws DatabaseException {
        EnvironmentConfig environmentConfig = new EnvironmentConfig();
        environmentConfig.setDurability(Durability.COMMIT_NO_SYNC);
        environmentConfig.setAllowCreate(true);
        environmentConfig.setTransactional(true);
        environmentConfig.setSharedCache(true);
        environmentConfig.setCacheSize(CACHE_SIZE);


        DatabaseConfig databaseConfig = new DatabaseConfig();
        databaseConfig.setAllowCreate(true);
        databaseConfig.setTransactional(true);
        databaseConfig.setSortedDuplicates(true);

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        final int totalSize = Integer.parseInt(args[2]);
        final int increment = Integer.parseInt(args[3]);
        final int threads = Integer.parseInt(args[4]);


        Environment environment;
        EnvironmentConfig environmentConfig;
        DatabaseConfig databaseConfig;


        environmentConfig = new EnvironmentConfig();
        environmentConfig.setCacheSize(cacheSize);
        environmentConfig.setDurability(Durability.COMMIT_NO_SYNC);
        environmentConfig.setConfigParam(EnvironmentConfig.LOG_FILE_MAX, "1000000000");
        environmentConfig.setConfigParam(EnvironmentConfig.CLEANER_MAX_BATCH_FILES, "100");
        environmentConfig.setConfigParam(EnvironmentConfig.CLEANER_READ_SIZE, "52428800");
        environmentConfig.setAllowCreate(true);
        environmentConfig.setTransactional(true);
        databaseConfig = new DatabaseConfig();
        databaseConfig.setAllowCreate(true);
        // databaseConfig.setDeferredWrite(true);
        databaseConfig.setTransactional(true);
        databaseConfig.setNodeMaxEntries(1024);

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        String storeName = args[1];
        String serverProperties = args[2];


        VoldemortConfig config = new VoldemortConfig(new Props(new File(serverProperties)));


        EnvironmentConfig environmentConfig = new EnvironmentConfig();
        environmentConfig.setDurability(Durability.COMMIT_NO_SYNC);
        environmentConfig.setAllowCreate(true);
        environmentConfig.setTransactional(config.isBdbWriteTransactionsEnabled());
        Environment environment = new Environment(new File(bdbDir), environmentConfig);
        DatabaseConfig databaseConfig = new DatabaseConfig();
        databaseConfig.setAllowCreate(true);
        databaseConfig.setTransactional(config.isBdbWriteTransactionsEnabled());
        databaseConfig.setSortedDuplicates(false);

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    @Override
    @Before
    public void setUp() throws Exception {
        super.setUp();
        this.envConfig = new EnvironmentConfig();
        this.envConfig.setDurability(Durability.COMMIT_NO_SYNC);
        this.envConfig.setAllowCreate(true);
        this.envConfig.setTransactional(true);
        this.tempDir = TestUtils.createTempDir();
        this.environment = new Environment(this.tempDir, envConfig);

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    // STORAGE_PATH = storagePath + "/" + hostname ;
    _storagePath = storagePath;
  }


  private void createStore() {
    final EnvironmentConfig envConfig = new EnvironmentConfig();
    envConfig.setAllowCreate(true);
    envConfig.setLocking(false); // no concurrent accesses
    envConfig.setTransactional(false);
    envConfig.setConfigParam("je.env.runCheckpointer", "false");
    envConfig.setConfigParam("je.cleaner.minUtilization", "25");
    // envConfig.setConfigParam("je.env.runCleaner", "false");
    // envConfig.ENV_DUP_CORRECT_PRELOAD_ALL false
    // envConfig.setConfigParam("je.log.fileMax", "100000000"); // 100MB
    
    // Disk space grows exponentially for skewed data
    //   independently of cacheSize, cacheMode 
    //   BerkeleyDBStoreSkewed reduces the effect, but not completely
    // Keep in mind that it's impossible to obtain strong scalability with fixed amount of cache memory
    //   as the proportion of data in disk in cache grows in disk favor, and disk is slower
    // When scaling, it is important to keep the number of disk readers/writers constant per blade
    envConfig.setCacheSize(512 * 1024 * 1024);
    
    final File envDir = new File(_storagePath);
    if (!envDir.exists())
      envDir.mkdirs();
    _env = new Environment(envDir, envConfig);

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