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Subject [6/8] cassandra git commit: merge from 2.2
Date Fri, 28 Aug 2015 22:07:17 GMT
merge from 2.2


Branch: refs/heads/trunk
Commit: 3d57428141fee10b444731bea50d45e950149862
Parents: e805f14 f2b6616
Author: Jonathan Ellis <>
Authored: Fri Aug 28 17:06:56 2015 -0500
Committer: Jonathan Ellis <>
Committed: Fri Aug 28 17:06:56 2015 -0500

 NEWS.txt | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
diff --cc NEWS.txt
index 2af3ca1,2523af2..33d67da
--- a/NEWS.txt
+++ b/NEWS.txt
@@@ -13,97 -13,9 +13,95 @@@ restore snapshots created with the prev
  'sstableloader' tool. You can upgrade the file format of your snapshots
  using the provided 'sstableupgrade' tool.
 +New features
 +   - Materialized Views, which allow for server-side denormalization, is now
 +     available. Materialized views provide an alternative to secondary indexes
 +     for non-primary key queries, and perform much better for indexing high
 +     cardinality columns.
 +     See
 +   - Hinted handoff has been completely rewritten. Hints are now stored in flat
 +     files, with less overhead for storage and more efficient dispatch.
 +     See CASSANDRA-6230 for full details.
 +   - Option to not purge unrepaired tombstones. To avoid users having data resurrected
 +     if repair has not been run within gc_grace_seconds, an option has been added to
 +     only allow tombstones from repaired sstables to be purged. To enable, set the
 +     compaction option 'only_purge_repaired_tombstones':true but keep in mind that if
 +     you do not run repair for a long time, you will keep all tombstones around which
 +     can cause other problems.
 +   - Max mutation size is now configurable via max_mutation_size_in_kb setting in
 +     cassandra.yaml; the default is half the size commitlog_segment_size_in_mb * 1024.
 +   - 3.0 requires Java 8u40 or later.
 +   - The default JVM GC has been changed to G1GC.
 +   - The default JVM flag -XX:+PerfDisableSharedMem will cause the following tools JVM
 +     to stop working: jps, jstack, jinfo, jmc, jcmd as well as 3rd party tools like Jolokia.
 +     If you wish to use these tools you can comment this flag out in cassandra-env.{sh,ps1}
 +   - New transaction log files have been introduced to replace the compactions_in_progress
 +     system table, temporary file markers (tmp and tmplink) and sstable ancerstors.
 +     Therefore, compaction metadata no longer contains ancestors. Transaction log files
 +     list sstable descriptors involved in compactions and other operations such as flushing
 +     and streaming. Use the sstableutil tool to list any sstable files currently involved
 +     in operations not yet completed, which previously would have been marked as temporary.
 +     A transaction log file contains one sstable per line, with the prefix "add:" or "remove:".
 +     They also contain a special line "commit", only inserted at the end when the transaction
 +     is committed. On startup we use these files to cleanup any partial transactions that
 +     in progress when the process exited. If the commit line is found, we keep new sstables
 +     (those with the "add" prefix) and delete the old sstables (those with the "remove"
 +     vice-versa if the commit line is missing. Should you lose or delete these log files,
 +     both old and new sstable files will be kept as live files, which will result in duplicated
 +     sstables. These files are protected by incremental checksums so you should not manually
 +     edit them. When restoring a full backup or moving sstable files, you should clean-up
 +     any left over transactions and their temporary files first. You can use this command:
 +      ===> sstableutil -c ks table
 +     See CASSANDRA-7066 for full details.
 +   - New write stages have been added for batchlog and materialized view mutations
 +     you can set their size in cassandra.yaml
 +   - User defined functions are now executed in a sandbox.
 +     To use UDFs and UDAs, you have to enable them in cassandra.yaml.
 +   - New SSTable version 'la' with improved bloom-filter false-positive handling
 +     compared to previous version 'ka' used in 2.2 and 2.1. Running sstableupgrade
 +     is not necessary but recommended.
 +   - Before upgrading to 3.0, make sure that your cluster is in complete agreement
 +     (schema versions outputted by `nodetool describecluster` are all the same).
 +   - Schema metadata is now stored in the new `system_schema` keyspace, and
 +     legacy `system.schema_*` tables are now gone; see CASSANDRA-6717 for details.
 +   - Pig's CassandraStorage has been removed. Use CqlNativeStorage instead.
 +   - Hadoop BulkOutputFormat and BulkRecordWriter have been removed; use
 +     CqlBulkOutputFormat and CqlBulkRecordWriter instead.
 +   - Hadoop ColumnFamilyInputFormat and ColumnFamilyOutputFormat have been removed;
 +     use CqlInputFormat and CqlOutputFormat instead.
 +   - Hadoop ColumnFamilyRecordReader and ColumnFamilyRecordWriter have been removed;
 +     use CqlRecordReader and CqlRecordWriter instead.
 +   - hinted_handoff_enabled in cassandra.yaml no longer supports a list of data centers.
 +     To specify a list of excluded data centers when hinted_handoff_enabled is set to true,
 +     use hinted_handoff_disabled_datacenters, see CASSANDRA-9035 for details.
 +   - The `sstable_compression` and `chunk_length_kb` compression options have been deprecated.
 +     The new options are `class` and `chunk_length_in_kb`. Disabling compression should
 +     be done by setting the new option `enabled` to `false`.
 +   - Only map syntax is now allowed for caching options. ALL/NONE/KEYS_ONLY/ROWS_ONLY syntax
 +     has been deprecated since 2.1.0 and is being removed in 3.0.0.
 +   - The 'index_interval' option for 'CREATE TABLE' statements, which has been deprecated
 +     since 2.1 and replaced with the 'min_index_interval' and 'max_index_interval' options,
 +     has now been removed.
 +   - Batchlog entries are now stored in a new table - system.batches.
 +     The old one has been deprecated.
 +   - JMX methods set/getCompactionStrategyClass have been removed, use
 +     set/getCompactionParameters or set/getCompactionParametersJson instead.
 +   - SizeTieredCompactionStrategy parameter cold_reads_to_omit has been removed.
 +   - The secondary index API has been comprehensively reworked. This will be a breaking
 +     change for any custom index implementations, which should now look to implement
 +     the new org.apache.cassandra.index.Index interface.
- 2.2.1
- =====
- New features
- ------------
-    - COUNT(*) and COUNT(1) can be selected with other columns or functions
+ 2.2.2
+ =====
  Changed Defaults
@@@ -112,6 -24,19 +110,14 @@@
+ 2.2.1
+ =====
 -    - Nothing specific to this release, but please see 2.2 if you are upgrading
 -      from a previous version.
+ New features
+ ------------
+    - COUNT(*) and COUNT(1) can be selected with other columns or functions

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