Repository: hbase Updated Branches: refs/heads/branch-1 10e889b1b -> b3935ec9a
HBASE-9004 Fix Documentation around Minor Compaction and TTL (Masatake Iwasaki) Project: http://git-wip-us.apache.org/repos/asf/hbase/repo Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/b3935ec9 Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/b3935ec9 Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/b3935ec9 Branch: refs/heads/branch-1 Commit: b3935ec9ad71e122666049e6bfeb3f556377c23d Parents: 10e889b Author: Misty Stanley-Jones <[email protected]> Authored: Tue Oct 7 13:32:51 2014 +1000 Committer: Misty Stanley-Jones <[email protected]> Committed: Tue Oct 7 13:33:41 2014 +1000 ---------------------------------------------------------------------- src/main/docbkx/schema_design.xml | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hbase/blob/b3935ec9/src/main/docbkx/schema_design.xml ---------------------------------------------------------------------- diff --git a/src/main/docbkx/schema_design.xml b/src/main/docbkx/schema_design.xml index 9f3f350..01434c3 100644 --- a/src/main/docbkx/schema_design.xml +++ b/src/main/docbkx/schema_design.xml @@ -368,10 +368,10 @@ COLUMN CELL <para>If you pre-split your table, it is <emphasis>critical</emphasis> to understand how your rowkey will be distributed across the region boundaries. As an example of why this is important, consider the example of using displayable hex characters as the lead position of - the key (e.g., "0000000000000000" to "ffffffffffffffff"). Running those - key ranges through <code>Bytes.split</code> (which is the split strategy used when creating - regions in <code>HBaseAdmin.createTable(byte[] startKey, byte[] endKey, numRegions)</code> - for 10 regions will generate the following splits... </para> + the key (e.g., "0000000000000000" to "ffffffffffffffff"). Running those key ranges through + <code>Bytes.split</code> (which is the split strategy used when creating regions in + <code>HBaseAdmin.createTable(byte[] startKey, byte[] endKey, numRegions)</code> for 10 + regions will generate the following splits...</para> <screen> 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 // 0 54 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 -10 // 6 @@ -503,12 +503,17 @@ public static byte[][] getHexSplits(String startKey, String endKey, int numRegio <section xml:id="ttl"> <title>Time To Live (TTL)</title> - <para>ColumnFamilies can set a TTL length in seconds, and HBase will automatically delete rows + <para> ColumnFamilies can set a TTL length in seconds, and HBase will automatically delete rows once the expiration time is reached. This applies to <emphasis>all</emphasis> versions of a - row - even the current one. The TTL time encoded in the HBase for the row is specified in UTC. </para> - <para>See <link - xlink:href="http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HColumnDescriptor.html";>HColumnDescriptor</link> - for more information. </para> + row - even the current one. The TTL time encoded in the HBase for the row is specified in UTC. + </para> + <para> Store files which contains only expired rows are deleted on minor compaction. Setting + <varname>hbase.store.delete.expired.storefile</varname> to <code>false</code> disables this + feature. Setting <link linkend="schema.minversions">minimum number of versions</link> to other + than 0 also disables this.</para> + <para> See <link + xlink:href="http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HColumnDescriptor.html"; + >HColumnDescriptor</link> for more information. </para> </section> <section xml:id="cf.keep.deleted">
