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From slebre...@apache.org
Subject [4/4] git commit: Add cli help for new caching parameters
Date Wed, 07 Mar 2012 10:17:59 GMT
Add cli help for new caching parameters

patch by vijay; reviewed by slebresne for CASSANDRA-3984


Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/9829e2be
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/9829e2be
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/9829e2be

Branch: refs/heads/cassandra-1.1
Commit: 9829e2be58702ea4e1897805b92712b867b6ced2
Parents: e58540f
Author: Sylvain Lebresne <sylvain@datastax.com>
Authored: Tue Mar 6 11:46:09 2012 +0100
Committer: Sylvain Lebresne <sylvain@datastax.com>
Committed: Tue Mar 6 11:46:09 2012 +0100

----------------------------------------------------------------------
 .../org/apache/cassandra/cli/CliHelp.yaml          |   29 +++++++++++++--
 1 files changed, 25 insertions(+), 4 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cassandra/blob/9829e2be/src/resources/org/apache/cassandra/cli/CliHelp.yaml
----------------------------------------------------------------------
diff --git a/src/resources/org/apache/cassandra/cli/CliHelp.yaml b/src/resources/org/apache/cassandra/cli/CliHelp.yaml
index 72a8bb6..9044fc0 100644
--- a/src/resources/org/apache/cassandra/cli/CliHelp.yaml
+++ b/src/resources/org/apache/cassandra/cli/CliHelp.yaml
@@ -524,10 +524,10 @@ commands:
         create column family Super4
             with column_type = 'Super'
             and comparator = 'AsciiType'
-            and rows_cached = 10000;
+            and caching='ALL';
         create column family Standard3
             with comparator = 'LongType'
-            and rows_cached = 10000;
+            and caching='ALL';
         create column family Standard4
             with comparator = AsciiType
             and column_metadata =
@@ -709,6 +709,27 @@ commands:
           It is also valid to specify the fully-qualified class name to a class that
           extends org.apache.cassandra.db.marshal.AbstractType.
 
+        - caching: Enable/Disable caching for the column family.
+
+          There is 2 kind of caches: key cache and row cache. A column family
+          can be set to use no cache, only one of them or both.
+
+          A key cache hit saves 1 seek while a row cache hit avoids disk
+          completely (saving at least 2 seeks). However the row cache holds
+          entire rows and is thus much more space-intensive. Also, since full
+          rows are stored, row cache should be used only for column families
+          whose rows are small.
+
+          Note: the global memory size of both cache can be set in the
+          configuration file (yaml) or through JMX (though it isn't persisted
+          across restarts in that latter case).
+
+          Supported values are:
+            - ALL (Enable row cache and key Cache)
+            - KEYS_ONLY
+            - ROWS_ONLY
+            - NONE;
+
         - max_compaction_threshold: The maximum number of SSTables allowed before a
         minor compaction is forced. Default is 32, setting to 0 disables minor
         compactions.
@@ -748,9 +769,9 @@ commands:
         Examples:
         update column family Super4
             with column_type = 'Super'
-            and rows_cached = 10000;
+            and caching='ALL';
         update column family Standard3
-            with rows_cached = 10000;
+            and caching='ALL';
         update column family Standard4
             with column_metadata =
             [{


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