Author: kturner
Date: Tue Apr 8 16:51:29 2014
New Revision: 1585780
URL: http://svn.apache.org/r1585780
Log:
ACCUMULO-2396 updated release notes based on comments from ecn
Modified:
accumulo/site/trunk/content/release_notes/1.6.0.mdtext
Modified: accumulo/site/trunk/content/release_notes/1.6.0.mdtext
URL:
http://svn.apache.org/viewvc/accumulo/site/trunk/content/release_notes/1.6.0.mdtext?rev=1585780&r1=1585779&r2=1585780&view=diff
==============================================================================
--- accumulo/site/trunk/content/release_notes/1.6.0.mdtext (original)
+++ accumulo/site/trunk/content/release_notes/1.6.0.mdtext Tue Apr 8 16:51:29
2014
@@ -36,7 +36,7 @@ Administering an Accumulo instance with
### Conditional Mutations
-Accumulo has not offered a way to make atomic row changes until now. Accumulo
now supports atomic test and set row operations.
[ACCUMULO-1000][ACCUMULO-1000] added conditional mutations and a conditional
writer. A conditional mutation has tests on columns that must pass before any
changes are made. These test are executed in server processes while a row lock
is held. Below is a simple example of making atomic row changes using
conditional mutations.
+Accumulo now offers a way to make atomic read,modify,write row changes from
the client side. Accumulo now supports atomic test and set row operations.
[ACCUMULO-1000][ACCUMULO-1000] added conditional mutations and a conditional
writer. A conditional mutation has tests on columns that must pass before any
changes are made. These test are executed in server processes while a row lock
is held. Below is a simple example of making atomic row changes using
conditional mutations.
1. Read columns X,Y,SEQ into a,b,s from row R1 using an isolated scanner.
2. For row R1 write conditional mutation X=f(a),Y=g(b),SEQ=s+1 if SEQ==s.
@@ -65,23 +65,15 @@ Accumulo only sorts data lexicographical
//sorting ba1,ba2,ba3,ba4, and ba5 lexicographically will result in the
same order as sorting the ComparablePairs
-### Multi-table Accumulo input format
-
-[ACCUMULO-391][ACCUMULO-391] makes it possible to easily read from multiple
tables in a Map Reduce job. TODO is there more to say about this, if not maybe
move to one-liners.
-
### Locality groups in memory
In cases where a very small amount of data is stored in a locality group one
would expect fast scans over that locality group. However this was not always
the case because recently written data stored in memory was not partitioned by
locality group. Therefore if a table had 100GB of data in memory and 1MB of
that was in locality group A, then scanning A would have required reading all
100GB. [ACCUMULO-112][ACCUMULO-112] changes this and partitions data by
locality group as its written.
-### Jline2 support in shell
-
-[ACCUMULO-1442][ACCUMULO-1442] TODO whats some of the goodness this brings to
the shell?
-
### Service IP addresses
Previous versions of Accumulo always used IP addresses internally. This could
be problematic in virtual machine environments where IP addresses change. In
[ACCUMULO-1585][ACCUMULO-1585] this was changed, now the accumulo uses the
exact hostnames from its config files for internal addressing.
-All Accumulo processes running on a cluster are locatable via zookeeper.
Therefore using well known ports is not really required.
[ACCUMULO-1664][ACCUMULO-1664] makes it possible to for all Accumulo processes
to use random ports. This makes it easier to run multiple Accumulo processes
on a single node.
+All Accumulo processes running on a cluster are locatable via zookeeper.
Therefore using well known ports is not really required.
[ACCUMULO-1664][ACCUMULO-1664] makes it possible to for all Accumulo processes
to use random ports. This makes it easier to run multiple Accumulo instances
on a single node.
### ViewFS
@@ -103,9 +95,11 @@ TODO some bugs may be unintelligible to
* [ACCUMULO-324][ACCUMULO-324] System/site constraints and iterators should
NOT affect the METADATA table
* [ACCUMULO-335][ACCUMULO-335] Batch scanning over the !METADATA table can
cause issues
+ * [ACCUMULO-391][ACCUMULO-391] Added support for reading from multiple tables
in a Map Reduce job.
* [ACCUMULO-1018][ACCUMULO-1018] Client does not give informative message
when user can not read table
+ * [ACCUMULO-1442][ACCUMULO-1442] JLine2 support was added to the shell. This
adds features like history search and other nice things GNU Readline has.
* [ACCUMULO-1492][ACCUMULO-1492] bin/accumulo should follow symbolic links
- * [ACCUMULO-1572][ACCUMULO-1572] Single node zookeeper failure kills
connected accumulo servers
+ * [ACCUMULO-1572][ACCUMULO-1572] Single node zookeeper failure kills
connected Accumulo servers
* [ACCUMULO-1661][ACCUMULO-1661] AccumuloInputFormat cannot fetch empty
column family
* [ACCUMULO-1696][ACCUMULO-1696] Deep copy in the compaction scope iterators
can throw off the stats
* [ACCUMULO-1698][ACCUMULO-1698] stop-here doesn't consider system hostname
