Introduction to HBase
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This document contains information about Apache HBase including links to documentation pages, JIRA issues, and discussions on using HBase. It provides configuration examples for viewing HFile contents, explains how Bloom filters are used in HBase, includes an overview of the HBase data model and comparisons with RDBMS. It also shows an example Git diff of modifying the HBase heap size configuration and provides links to guides on using HBase and documentation on region splitting and merging.
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Introduction to HBase
- 4. S = supported and tested, X = not supported, NT = it should run, but not tested enough.
- 10. Name HBase RDBMS Database model Wide column store (BigTable Concept) Relational DBMS Data scheme schema-free yes Typing no yes Secondary indexes no yes SQL no yes Triggers yes yes Replication methods selectable replication factor Master-master replication Master-slave replication Consistency concepts Immediate Consistency Foreign keys no yes Transaction concepts no ACID Concurrency yes yes Durability yes yes
- 19. Row Key Time Stamp ColumnFamily contents ColumnFamily anchor anchor:cnnsi.com = "com.cnn.www" t9 "CNN" anchor:my.look.ca = "com.cnn.www" t8 "CNN.com" "com.cnn.www" t6 contents:html = "<html>..." "com.cnn.www" t5 contents:html = "<html>..." "com.cnn.www" t3 contents:html = "<html>..." Time Time Row Key Column Family anchor Row Key ColumnFamily "contents:" Stamp Stamp "com.cnn.www" t9 anchor:cnnsi.com = "CNN" "com.cnn.www" t6 contents:html = "<html>..." "com.cnn.www" t8 anchor:my.look.ca = "CNN.com" "com.cnn.www" t5 contents:html = "<html>..." "com.cnn.www" t3 contents:html = "<html>..."
- 28. To view a textualized version of hfile content, you can do use theorg.apache.hadoop.hbase.io.hfile.HFile tool. Type the following to see usage: $ ${HBASE_HOME}/bin/hbase org.apache.hadoop.hbase.io.hfile.HFile For example, to view the content of the filehdfs://10.81.47.41:8020/hbase/TEST/1418428042/DSMP/475950861828 6845475, type the following: $ ${HBASE_HOME}/bin/hbase org.apache.hadoop.hbase.io.hfile.HFile -v -f hdfs://10.81.47.41:8020/hbase/TEST/1418428042/DSMP/4759508618286845475 If you leave off the option -v to see just a summary on the hfile.
- 29. Burton Howard Bloom [1] probabilistic data structure element set http://www.quora.com/How-are-bloom-filters-used-in-HBase
- 50. $ git diff hbase-env.sh diff --git a/conf/hbase-env.sh b/conf/hbase-env.sh index e70ebc6..96f8c27 100644 --- a/conf/hbase-env.sh +++ b/conf/hbase-env.sh @@ -31,7 +31,7 @@ export JAVA_HOME=/usr/lib//jvm/java-6-sun/ # export HBASE_CLASSPATH= # The maximum amount of heap to use, in MB. Default is 1000. -# export HBASE_HEAPSIZE=1000 +export HBASE_HEAPSIZE=8192 # Extra Java runtime options. # Below are what we set by default. May only work with SUN JVM.