December 2012
Intermediate to advanced
572 pages
13h 8m
Chinese
Content preview from HBASE技術手冊
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效能調校
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453
第 408 頁上“region 伺服器度量指標”做過說明）—例如，5 MB —增加 memstore
限制，來減少這個原因所造成的過多 I/O 數量。
增加阻止的儲存檔
（Increase blocking store files）
這個值是利用
hbase.hstore.blockingStoreFiles
屬性來設定，定義 region 伺服器
何時阻止客戶端進一步的更新，讓壓縮有時間能減少檔案的數目。當你的負載有時
會插入到工作的高峰期時，考慮這些高峰值，就應該稍微增加這個值—預設是七個
檔案。
使用監控圖表來表示 region 伺服器維護的儲存檔數量。如果這個數量一直很高，你
可能不想增大這個值，因為這只會延緩伺服器過載，這是無法避免的問題。
增加阻止的乘法器
（Increase block multiplier）
hbase.hregion.memstore.block.multiplier
屬性，預設為
2
，是一個安全閂，當
memstores 超過
multiplier * flush
大小限制時，阻止來自客戶端的任何進一步更新。
當你有
足夠
的記憶體可自由使用時，你可以增加此值，更恰當地處理高峰值問題：
你可以暫時接受更多的資料，而不是禁止更新來等待刷新完成。
降低最大日誌檔案
（Decrease maximum logfiles）
設定
hbase
.regionserver.maxlogs
屬性，可以根據磁碟上 WA L 檔案的數量，控制
多久進行刷新。預設值是
32
，對一個寫入繁重的使用案例算是高的。降低它 ...
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