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# Amazon EMR WAL の料金とメトリクスについて
<a name="emr-hbase-wal-metrics"></a>


| コア機能請求単位 | 詳細 | 
| --- | --- | 
| EMR-WAL-Read-GiB | API calls to read data from your table are billed as ReadRequestGiB. This includes [`Get` and `Scan`](https://hbase.apache.org/book.html#_data_model_operations) operations. Reads are charged based on the sizes of the read items. Amazon EMR bills at a minimum of 1 byte. For example, if you read a 1234.12 bytes item, you're charged for 1235 bytes. Reads are aggregated every hour for billing and shown as GiBs. | 
| EMR-WAL-Write-GiB | API calls to write data from your table are billed as Write-GiB. This includes [https://hbase.apache.org/book.html#_data_model_operations](https://hbase.apache.org/book.html#_data_model_operations) operations. Writes are charged based on the sizes of the written items. Amazon EMR bills at a minimum of 1 byte. For example, if you write a 1234.12 bytes item, you're charged for 1235 bytes. Writes are aggregated every hour for billing and shown as GiBs. | 
| EMR-WAL-WALHours | サービスに保存している WAL の数は `EMR-WAL-WALHours` として請求されます。Amazon EMR は、HBase リージョンごとに 1 つの WAL を作成します。例えば、システムテーブルを含む 20 個の HBase テーブルを作成し、各テーブルに 2 つの HBase リージョンがある場合、次の計算のように 28,800 WAL 時間を使用することになります。 <pre>  20 tables <br />x  2 Regions per table <br />x  1 WAL per Region <br />x 30 days <br />x 24 hours <br />-----------<br />28,800 EMR-WAL-WALHours</pre> | 

**`EMRWALCount` の例:**

![\[Line graph showing ResourceCount fluctuations over time, ranging from about 18.87 to 19.20.\]](http://docs.aws.amazon.com/ja_jp/emr/latest/ReleaseGuide/images/wal-metric.png)


**`EMRWALWorkspaceCount` の例:**

![\[Graph showing ResourceCount fluctuations over time, ranging from 7.97 to 8.32.\]](http://docs.aws.amazon.com/ja_jp/emr/latest/ReleaseGuide/images/wal-metric2.png)