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Javadoc on what BLOCKSIZE means (related to HBASE-15248)

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Michael Stack 2017-03-06 15:53:13 -08:00
parent 7fa7156f2c
commit 4beae9a56e
1 changed files with 4 additions and 1 deletions
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5
hbase-client/src/main/java/org/apache/hadoop/hbase/HColumnDescriptor.java
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@ -103,7 +103,10 @@ public class HColumnDescriptor implements Comparable<HColumnDescriptor> {
/**
* Size of storefile/hfile 'blocks'. Default is {@link #DEFAULT_BLOCKSIZE}.
* Use smaller block sizes for faster random-access at expense of larger
* indices (more memory consumption).
* indices (more memory consumption). Note that this is a soft limit and that
* blocks have overhead (metadata, CRCs) so blocks will tend to be the size
* specified here and then some; i.e. don't expect that setting BLOCKSIZE=4k
* means hbase data will align with an SSDs 4k page accesses (TODO).
*/
public static final String BLOCKSIZE = "BLOCKSIZE";