Repository: hbase Updated Branches: refs/heads/master 7d10af125 -> f72c3ef34
HBASE-12648 Document per-cell TTLs (Andrew Purtell) Project: http://git-wip-us.apache.org/repos/asf/hbase/repo Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/f72c3ef3 Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/f72c3ef3 Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/f72c3ef3 Branch: refs/heads/master Commit: f72c3ef34d755dc0a1fef6cf744b8add931e166a Parents: 7d10af1 Author: Misty Stanley-Jones <[email protected]> Authored: Fri Dec 12 13:41:39 2014 +1000 Committer: Misty Stanley-Jones <[email protected]> Committed: Fri Dec 12 13:41:39 2014 +1000 ---------------------------------------------------------------------- src/main/docbkx/schema_design.xml | 15 +++++++++++++++ 1 file changed, 15 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hbase/blob/f72c3ef3/src/main/docbkx/schema_design.xml ---------------------------------------------------------------------- diff --git a/src/main/docbkx/schema_design.xml b/src/main/docbkx/schema_design.xml index 65e64b0..e4632ec 100644 --- a/src/main/docbkx/schema_design.xml +++ b/src/main/docbkx/schema_design.xml @@ -509,6 +509,21 @@ public static byte[][] getHexSplits(String startKey, String endKey, int numRegio <para> See <link xlink:href="http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HColumnDescriptor.html"; >HColumnDescriptor</link> for more information. </para> + <para>Recent versions of HBase also support setting time to live on a per cell basis. See <link + xlink:href="https://issues.apache.org/jira/browse/HBASE-10560";>HBASE-10560</link> for more + information. Cell TTLs are submitted as an attribute on mutation requests (Appends, + Increments, Puts, etc.) using Mutation#setTTL. If the TTL attribute is set, it will be applied + to all cells updated on the server by the operation. There are two notable differences + between cell TTL handling and ColumnFamily TTLs:</para> + <itemizedlist> + <listitem> + <para>Cell TTLs are expressed in units of milliseconds instead of seconds.</para> + </listitem> + <listitem> + <para>A cell TTLs cannot extend the effective lifetime of a cell beyond a ColumnFamily level + TTL setting.</para> + </listitem> + </itemizedlist> </section> <section xml:id="cf.keep.deleted">
