accumulo-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
Subject svn commit: r1660210 - /accumulo/site/trunk/content/release_notes/1.6.2.mdtext
Date Mon, 16 Feb 2015 21:44:45 GMT
Author: elserj
Date: Mon Feb 16 21:44:45 2015
New Revision: 1660210

Some more bug fixes for 1.6.2


Modified: accumulo/site/trunk/content/release_notes/1.6.2.mdtext
--- accumulo/site/trunk/content/release_notes/1.6.2.mdtext (original)
+++ accumulo/site/trunk/content/release_notes/1.6.2.mdtext Mon Feb 16 21:44:45 2015
@@ -54,6 +54,42 @@ is meant to represent all of the informa
 or DevOps-types to observe and act on scans which are running for excessive periods of time.
 fixes `ActiveScan` to ensure that the internal identifier `scanId` is properly set.
+### Table state change doesn't wait when requested
+An Accumulo table has two states: `ONLINE` and `OFFLINE`. An offline table in Accumulo consumes
no TabletServer
+resources, only HDFS resources, which makes it useful to save infrequently used data. The
Accumulo methods provided
+to transition a state from `ONLINE` to `OFFLINE` and vice versa did not respect the `wait=true`
+when set. [ACCUMULO-3301][8] fixes the underlying implementation to ensure that when `wait=true`
is provided,
+the method will not return until the table's state transition has fully completed.
+### KeyValue doesn't implement `hashCode()` or `equals()`
+The `KeyValue` class is an implementation of `Entry<Key,Value>` which is returned by
the classes like
+`Scanner` and `BatchScanner`. [ACCUMULO-3217][9] adds these methods which ensure that the
returned `Entry<Key,Value>`
+operates as expected with `HashMaps` and `HashSets`. 
+### Potential deadlock in TabletServer
+Internal to the TabletServer, there are methods to construct instances of configuration objects
for tables
+and namespaces. The locking on these methods was not correctly implemented which created
the possibility to
+have concurrent requests to a TabletServer to deadlock. [ACCUMULO-3372][10] found this problem
while performing
+bulk imports of RFiles into Accumulo. Additional synchronization was added server-side to
prevent this deadlock
+from happening in the future.
+### The `DateLexicoder` incorrectly serialized `Dates` prior 1970
+The `DateLexicode`, a part of the `Lexicoders` classes which implement methods to convert
common type primitives
+into lexicographically sorting Strings/bytes, incorrectly converted `Date` objects for dates
prior to 1970.
+[ACCUMULO-3385][11] fixed the `DateLexicoder` to correctly (de)serialize data `Date` objects.
For users with
+data stored in Accumulo using the broken implementation, the following can be performed to
read the old data.
+      Lexicoder lex = new ULongLexicoder();
+      for (Entry<Key, Value> e : scanner) {
+        Date d = new Date(lex.decode(TextUtil.getBytes(e.getKey().getRow())));
+        // ...
+      }
 ## Performance Improvements
 Apache Accumulo 1.6.2 includes a number of performance-related fixes over previous versions.
@@ -110,4 +146,8 @@ and, in HDFS High-Availability instances
\ No newline at end of file
\ No newline at end of file

View raw message