Author: jbellis
Date: Mon Sep 12 15:42:55 2011
New Revision: 1169805
URL: http://svn.apache.org/viewvc?rev=1169805&view=rev
Log:
set default RR chance to 0.1, update NEWS
patch by jbellis; reviewed by slebresne for CASSANDRA-3169
Modified:
cassandra/branches/cassandra-1.0.0/CHANGES.txt
cassandra/branches/cassandra-1.0.0/NEWS.txt
cassandra/branches/cassandra-1.0.0/src/java/org/apache/cassandra/config/CFMetaData.java
Modified: cassandra/branches/cassandra-1.0.0/CHANGES.txt
URL:
http://svn.apache.org/viewvc/cassandra/branches/cassandra-1.0.0/CHANGES.txt?rev=1169805&r1=1169804&r2=1169805&view=diff
==============================================================================
--- cassandra/branches/cassandra-1.0.0/CHANGES.txt (original)
+++ cassandra/branches/cassandra-1.0.0/CHANGES.txt Mon Sep 12 15:42:55 2011
@@ -68,6 +68,7 @@
(CASSANDRA-3119)
* rename CQL type names to match expected SQL behavior (CASSANDRA-3149, 3031)
* Arena-based allocation for memtables (CASSANDRA-2252, 3162, 3163)
+ * Default RR chance to 0.1 (CASSANDRA-3169)
0.8.6
Modified: cassandra/branches/cassandra-1.0.0/NEWS.txt
URL:
http://svn.apache.org/viewvc/cassandra/branches/cassandra-1.0.0/NEWS.txt?rev=1169805&r1=1169804&r2=1169805&view=diff
==============================================================================
--- cassandra/branches/cassandra-1.0.0/NEWS.txt (original)
+++ cassandra/branches/cassandra-1.0.0/NEWS.txt Mon Sep 12 15:42:55 2011
@@ -29,12 +29,6 @@ Features
- Ability to use multiple threads during a single compaction. See
multithreaded_compaction in cassandra.yaml for more details.
- Windows Service ("cassandra.bat install" to enable)
- - Hinted Handoff has two major improvements:
- - Hint replay is much more efficient thanks to a change in the data
model
- - Hints are created for all replicas that do not ack a write.
(Formerly,
- only replicas known to be down when the write started were hinted.)
- This means that running with read repair completely off is much more
- viable than before.
- A dead node may be replaced in a single step by starting a new node
with -Dcassandra.replace_token=<token>. More details can be found at
http://wiki.apache.org/cassandra/Operations#Replacing_a_Dead_Node
@@ -49,10 +43,13 @@ New data types
Other
-----
- - Hinted Handoff is substantially more robust, with the result that
- when HH is enabled, repair only needs to be run if a node crashes.
- - Because of this, read repair is disabled now by default on newly
- created ColumnFamilies.
+ - Hinted Handoff has two major improvements:
+ - Hint replay is much more efficient thanks to a change in the data
model
+ - Hints are created for all replicas that do not ack a write.
(Formerly,
+ only replicas known to be down when the write started were hinted.)
+ This means that running with read repair completely off is much more
+ viable than before, and the default read_repair_chance is reduced from
1.0
+ ("always repair") to 0.1 ("repair 10% of the time").
- The old per-ColumnFamily memtable thresholds
(memtable_throughput_in_mb, memtable_operations_in_millions,
memtable_flush_after_mins) are ignored, in favor of the global
Modified:
cassandra/branches/cassandra-1.0.0/src/java/org/apache/cassandra/config/CFMetaData.java
URL:
http://svn.apache.org/viewvc/cassandra/branches/cassandra-1.0.0/src/java/org/apache/cassandra/config/CFMetaData.java?rev=1169805&r1=1169804&r2=1169805&view=diff
==============================================================================
---
cassandra/branches/cassandra-1.0.0/src/java/org/apache/cassandra/config/CFMetaData.java
(original)
+++
cassandra/branches/cassandra-1.0.0/src/java/org/apache/cassandra/config/CFMetaData.java
Mon Sep 12 15:42:55 2011
@@ -55,7 +55,7 @@ public final class CFMetaData
public final static double DEFAULT_ROW_CACHE_SIZE = 0.0;
public final static double DEFAULT_KEY_CACHE_SIZE = 200000;
- public final static double DEFAULT_READ_REPAIR_CHANCE = 1.0;
+ public final static double DEFAULT_READ_REPAIR_CHANCE = 0.1;
public final static boolean DEFAULT_REPLICATE_ON_WRITE = true;
public final static int DEFAULT_ROW_CACHE_SAVE_PERIOD_IN_SECONDS = 0;
public final static int DEFAULT_KEY_CACHE_SAVE_PERIOD_IN_SECONDS = 4 *
3600;
