### Question:
DynamicDistributedLogConfiguration extends ConcurrentBaseConfiguration { public int getReadAheadBatchSize() { return getInt( this, BKDL_READAHEAD_BATCHSIZE, BKDL_READAHEAD_BATCHSIZE_OLD, getInt(defaultConfig, BKDL_READAHEAD_BATCHSIZE, BKDL_READAHEAD_BATCHSIZE_OLD, BKDL_READAHEAD_BATCHSIZE_DEFAULT) ); } DynamicDistributedLogConfiguration(ConcurrentBaseConfiguration defaultConfig); int getRetentionPeriodHours(); int getBpsSoftWriteLimit(); int getBpsHardWriteLimit(); int getRpsSoftWriteLimit(); int getRpsHardWriteLimit(); int getRpsSoftServiceLimit(); int getRpsHardServiceLimit(); int getRpsStreamAcquireServiceLimit(); int getBpsSoftServiceLimit(); int getBpsHardServiceLimit(); int getBpsStreamAcquireServiceLimit(); double getEIInjectedWriteDelayPercent(); int getEIInjectedWriteDelayMs(); int getOutputBufferSize(); int getPeriodicFlushFrequencyMilliSeconds(); int getReadAheadBatchSize(); int getReadAheadMaxRecords(); boolean getEnableLedgerAllocatorPool(); QuorumConfig getQuorumConfig(); int getMaxAcquiredPartitionsPerProxy(); int getMaxCachedPartitionsPerProxy(); boolean isDurableWriteEnabled(); boolean getDeserializeRecordSetOnReads();  }### Answer:
@Test(timeout = 20000) public void testGetReadAheadBatchSize() { ConcurrentBaseConfiguration defaultConfig = new ConcurrentBaseConfiguration(); DynamicDistributedLogConfiguration dynConf = new DynamicDistributedLogConfiguration(defaultConfig); assertEquals(BKDL_READAHEAD_BATCHSIZE_DEFAULT, dynConf.getReadAheadBatchSize()); defaultConfig.setProperty(BKDL_READAHEAD_BATCHSIZE_OLD, BKDL_READAHEAD_BATCHSIZE_DEFAULT + 1); assertEquals(BKDL_READAHEAD_BATCHSIZE_DEFAULT + 1, dynConf.getReadAheadBatchSize()); defaultConfig.setProperty(BKDL_READAHEAD_BATCHSIZE, BKDL_READAHEAD_BATCHSIZE_DEFAULT + 2); assertEquals(BKDL_READAHEAD_BATCHSIZE_DEFAULT + 2, dynConf.getReadAheadBatchSize()); dynConf.setProperty(BKDL_READAHEAD_BATCHSIZE_OLD, BKDL_READAHEAD_BATCHSIZE_DEFAULT + 3); assertEquals(BKDL_READAHEAD_BATCHSIZE_DEFAULT + 3, dynConf.getReadAheadBatchSize()); dynConf.setProperty(BKDL_READAHEAD_BATCHSIZE, BKDL_READAHEAD_BATCHSIZE_DEFAULT + 4); assertEquals(BKDL_READAHEAD_BATCHSIZE_DEFAULT + 4, dynConf.getReadAheadBatchSize()); }