何时在ApacheIgnite2.0中将默认缓存存储在堆外

Question

此配置在2.0版本中无效

<!-- Enable off-heap storage with unlimited size. -->
<property name="offHeapMaxMemory" value="0"/>

错误：

    WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: 
 Error creating bean with name 'grid.cfg' defined in URL [file:/home/ignite/sample-cache.xml]: Cannot create inner bean
 'org.apache.ignite.configuration.CacheConfiguration#4cc0edeb' of type  [org.apache.ignite.configuration.CacheConfiguration] while setting bean
  property 'cacheConfiguration' with key [0]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with
  name 'org.apache.ignite.configuration.CacheConfiguration#4cc0edeb' defined in URL [file:/home/ignite/sample-cache.xml]: Error setting property
  values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'offHeapMaxMemory' of bean class
 [org.apache.ignite.configuration.CacheConfiguration]: Bean property 'offHeapMaxMemory' is not writable or has an invalid setter method. Does the
 parameter type of the setter match the return type of the getter?

视盘SnapShot

Time of the snapshot: 07/07/17, 16:54:35
+===========================================================================================================================+
|    Name(@)    |    Mode     | Nodes |      Entries (Heap / Off-heap)      |   Hits    |  Misses   |   Reads   |  Writes   |
+===========================================================================================================================+
| txnCache(@c0) | PARTITIONED | 1     | min: 2917681 (2917681 / 0)          | min: 0    | min: 0    | min: 0    | min: 0    |
|               |             |       | avg: 2917681.00 (2917681.00 / 0.00) | avg: 0.00 | avg: 0.00 | avg: 0.00 | avg: 0.00 |
|               |             |       | max: 2917681 (2917681 / 0)          | max: 0    | max: 0    | max: 0    | max: 0    |
+---------------------------------------------------------------------------------------------------------------------------+

Cache 'txnCache(@c0)':
+--------------------------------------------------------------+
| Name(@)                     | txnCache(@c0)                  |
| Nodes                       | 1                              |
| Total size Min/Avg/Max      | 2917681 / 2917681.00 / 2917681 |
|   Heap size Min/Avg/Max     | 2917681 / 2917681.00 / 2917681 |
|   Off-heap size Min/Avg/Max | 0 / 0.00 / 0                   |
+--------------------------------------------------------------+

Nodes for: txnCache(@c0)
+============================================================================================================+
|     Node ID8(@), IP      | CPUs | Heap Used | CPU Load |   Up Time    |         Size         | Hi/Mi/Rd/Wr |
+============================================================================================================+
| 924C5A56(@n0), 10.0.2.55 | 2    | 8.93 %    | 93.83 %  | 00:12:31:969 | Total: 2917681       | Hi: 0       |
|                          |      |           |          |              |   Heap: 2917681      | Mi: 0       |
|                          |      |           |          |              |   Off-Heap: 0        | Rd: 0       |
|                          |      |           |          |              |   Off-Heap Memory: 0 | Wr: 0       |
+------------------------------------------------------------------------------------------------------------+
'Hi' - Number of cache hits.
'Mi' - Number of cache misses.
'Rd' - number of cache reads.
'Wr' - Number of cache writes.

Aggregated queries metrics:
  Minimum execution time: 00:00:00:000
  Maximum execution time: 00:00:00:000
  Average execution time: 00:00:00:000
  Total number of executions: 0
  Total number of failures:   0

管理程序快照显示Off/Off内存为0。在文档中，默认情况下，它被称为默认的off堆。在堆外存储之前有什么阈值吗？我该如何配置呢？

Answer 1

自2.0以来，在offHeapMaxMemory中没有CacheConfiguration属性。

是的，因为在默认情况下，2.0版本缓存将数据存储在离堆中。您可以通过以下方式检查：

cache.size(CachePeekMode.OFFHEAP))

但是，管理程序也没有正确计算“堆外条目计数”度量，但这已经是固定的，并且将在版本2.1中提供。