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HBASE-11171 More doc improvements on block cache options -- ADDENDUM TO FIX JAVADOC WARNINGS 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1595369 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2014-05-16 22:22:28 +00:00
parent 622d55c1b2
commit a5f6c55edd
1 changed files with 6 additions and 3 deletions
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9
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/package-info.java
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@ -53,7 +53,8 @@
* <a href="http://blog.cloudera.com/blog/2012/01/caching-in-hbase-slabcache/">Caching
* in Apache HBase: SlabCache</a>.To enable it,
* set the float <code>hbase.offheapcache.percentage</code>
* ({@link CacheConfig#SLAB_CACHE_OFFHEAP_PERCENTAGE_KEY}) to some value between 0 and 1 in
* ({@link org.apache.hadoop.hbase.io.hfile.CacheConfig#SLAB_CACHE_OFFHEAP_PERCENTAGE_KEY}) to some
* value between 0 and 1 in
* your <code>hbase-site.xml</code> file. This
* enables {@link org.apache.hadoop.hbase.io.hfile.DoubleBlockCache}, a facade over
* {@link org.apache.hadoop.hbase.io.hfile.LruBlockCache} and
@ -66,7 +67,8 @@
* multiplied by whatever the setting for <code>-XX:MaxDirectMemorySize</code> is in
* your <code>hbase-env.sh</code> configuration file and this is what
* will be used by {@link org.apache.hadoop.hbase.io.hfile.slab.SlabCache} as its offheap store.
* Onheap store will be whatever the float {@link HConstants#HFILE_BLOCK_CACHE_SIZE_KEY} setting is
* Onheap store will be whatever the float
* {@link org.apache.hadoop.hbase.HConstants#HFILE_BLOCK_CACHE_SIZE_KEY} setting is
* (some value between 0 and 1) times the size of the allocated java heap.
*
* <p>Restart (or rolling restart) your cluster for the configs to take effect. Check logs to
@ -90,7 +92,8 @@
* as a strict L2 cache to the L1 LruBlockCache (i.e. on eviction from L1, blocks go to L2), set
* {@link org.apache.hadoop.hbase.io.hfile.CacheConfig#BUCKET_CACHE_COMBINED_KEY} to false.
* Also by default, unless you change it,
* {@link CacheConfig#BUCKET_CACHE_COMBINED_PERCENTAGE_KEY} defaults to <code>0.9</code> (see
* {@link org.apache.hadoop.hbase.io.hfile.CacheConfig#BUCKET_CACHE_COMBINED_PERCENTAGE_KEY}
* defaults to <code>0.9</code> (see
* the top of the CacheConfig in the BucketCache defaults section). This means that whatever
* size you set for the bucket cache with
* {@link org.apache.hadoop.hbase.io.hfile.CacheConfig#BUCKET_CACHE_SIZE_KEY},