MmapMemoryManager (Pinot local segment implementations 1.0.0 API)

java.lang.Object
- org.apache.pinot.segment.local.io.readerwriter.RealtimeIndexOffHeapMemoryManager
- - org.apache.pinot.segment.local.io.writer.impl.MmapMemoryManager

All Implemented Interfaces:

Closeable, AutoCloseable, PinotDataBufferMemoryManager
```
public class MmapMemoryManager
extends RealtimeIndexOffHeapMemoryManager
```

Constructor Summary

Constructors
Constructor	Description
`MmapMemoryManager(String dirPathName, String segmentName)`
`MmapMemoryManager(String dirPathName, String segmentName, ServerMetrics serverMetrics)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected PinotDataBuffer`	`allocateInternal(long size, String columnName)`
`protected void`	`doClose()`	Method to be implemented by inheriting concrete classes
`static long`	`getDefaultFileLength()`

Methods inherited from class org.apache.pinot.segment.local.io.readerwriter.RealtimeIndexOffHeapMemoryManager
allocate, close, getTotalAllocatedBytes

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MmapMemoryManager
```
public MmapMemoryManager(String dirPathName,
                         String segmentName,
                         ServerMetrics serverMetrics)
```
    Parameters:
    
    dirPathName - directory under which all mmap files are created.
    
    segmentName - Name of the segment for which this memory manager allocates memory
    
    serverMetrics - Server metrics
    
    See Also:
    
    RealtimeIndexOffHeapMemoryManager
  - MmapMemoryManager
```
public MmapMemoryManager(String dirPathName,
                         String segmentName)
```
- Method Detail
  - getDefaultFileLength
```
public static long getDefaultFileLength()
```
  - allocateInternal
```
protected PinotDataBuffer allocateInternal(long size,
                                           String columnName)
```
    Specified by:
    
    allocateInternal in class RealtimeIndexOffHeapMemoryManager
    
    Parameters:
    
    size - size of memory to be mmaped
    
    columnName - Name of the column for which memory is being allocated
    
    Returns:
    
    buffer allocated in mmap mode
  - doClose
```
protected void doClose()
                throws IOException
```
    Description copied from class: RealtimeIndexOffHeapMemoryManager
    
    Method to be implemented by inheriting concrete classes
    
    Specified by:
    
    doClose in class RealtimeIndexOffHeapMemoryManager
    
    Throws:
    
    IOException