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HADOOP-12798. Update changelog and release notes (2016-03-04) (aw)

This commit is contained in:
Allen Wittenauer 2016-03-04 12:23:52 -08:00
parent 6f9d2f669f
commit 55f73a1cbd
238 changed files with 1787 additions and 296 deletions
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hadoop-common-project/hadoop-common/src/site/markdown/release/0.1.0/CHANGES.0.1.0.md
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# Apache Hadoop 0.1.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.1.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.10.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.10.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.11.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.11.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.11.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.12.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.12.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.12.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.12.3 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.13.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

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# Apache Hadoop 0.14.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.14.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.14.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.14.3 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.14.4 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.15.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.15.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.15.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.15.3 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop Changelog
## Release 0.15.4 - Unreleased
## Release 0.15.4 - Unreleased (as of 2016-03-04)
### INCOMPATIBLE CHANGES:
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# Apache Hadoop 0.15.4 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.16.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.16.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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# Apache Hadoop 0.16.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

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# Apache Hadoop 0.16.3 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

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# Apache Hadoop 0.16.4 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

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| [HADOOP-771](https://issues.apache.org/jira/browse/HADOOP-771) | Namenode should return error when trying to delete non-empty directory | Major | . | Milind Bhandarkar | Mahadev konar |
### IMPORTANT ISSUES:
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# Apache Hadoop 0.17.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
@ -416,7 +416,7 @@ Change DFS block placement to allocate the first replica locally, the second off
* [HADOOP-2551](https://issues.apache.org/jira/browse/HADOOP-2551) | *Blocker* | **hadoop-env.sh needs finer granularity**
New environment variables were introduced to allow finer grained control of Java options passed to server and client JVMs. See the new *\_OPTS variables in conf/hadoop-env.sh.
New environment variables were introduced to allow finer grained control of Java options passed to server and client JVMs. See the new \*\_OPTS variables in conf/hadoop-env.sh.
---

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| [HADOOP-3565](https://issues.apache.org/jira/browse/HADOOP-3565) | JavaSerialization can throw java.io.StreamCorruptedException | Major | . | Tom White | Tom White |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.17.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.17.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

8
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-->
# Apache Hadoop Changelog
## Release 0.17.3 - Unreleased
## Release 0.17.3 - Unreleased (as of 2016-03-04)
### INCOMPATIBLE CHANGES:
@ -26,6 +26,12 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.17.3 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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| [HADOOP-544](https://issues.apache.org/jira/browse/HADOOP-544) | Replace the job, tip and task ids with objects. | Major | . | Owen O'Malley | Enis Soztutar |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.18.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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@ -26,6 +26,12 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.18.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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| [HADOOP-4228](https://issues.apache.org/jira/browse/HADOOP-4228) | dfs datanode metrics, bytes\_read, bytes\_written overflows due to incorrect type used. | Blocker | metrics | Eric Yang | Eric Yang |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.18.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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| [HADOOP-4061](https://issues.apache.org/jira/browse/HADOOP-4061) | Large number of decommission freezes the Namenode | Major | . | Koji Noguchi | Tsz Wo Nicholas Sze |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.18.3 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

8
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-->
# Apache Hadoop Changelog
## Release 0.18.4 - Unreleased
## Release 0.18.4 - Unreleased (as of 2016-03-04)
### INCOMPATIBLE CHANGES:
@ -26,6 +26,12 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.18.4 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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@ -51,6 +51,12 @@
| [HADOOP-1700](https://issues.apache.org/jira/browse/HADOOP-1700) | Append to files in HDFS | Major | . | stack | dhruba borthakur |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

6
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.19.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
@ -304,7 +304,7 @@ Adds a new contrib, bash-tab-completion, which enables bash tab completion for t
* [HADOOP-3702](https://issues.apache.org/jira/browse/HADOOP-3702) | *Major* | **add support for chaining Maps in a single Map and after a Reduce [M\*/RM\*]**
Introduced ChainMapper and the ChainReducer classes to allow composing chains of Maps and Reduces in a single Map/Reduce job, something like MAP+ REDUCE MAP*.
Introduced ChainMapper and the ChainReducer classes to allow composing chains of Maps and Reduces in a single Map/Reduce job, something like MAP+ REDUCE MAP\*.
---
@ -474,7 +474,7 @@ Introduced LZOP codec.
* [HADOOP-2411](https://issues.apache.org/jira/browse/HADOOP-2411) | *Major* | **Add support for larger EC2 instance types**
Added support for c1.* instance types and associated kernels for EC2.
Added support for c1.\* instance types and associated kernels for EC2.
---

6
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@ -29,6 +29,12 @@
| [HADOOP-4061](https://issues.apache.org/jira/browse/HADOOP-4061) | Large number of decommission freezes the Namenode | Major | . | Koji Noguchi | Tsz Wo Nicholas Sze |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.19.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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| [HADOOP-5332](https://issues.apache.org/jira/browse/HADOOP-5332) | Make support for file append API configurable | Blocker | . | Nigel Daley | dhruba borthakur |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.19.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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@ -26,6 +26,12 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.2.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

6
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@ -26,6 +26,12 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.2.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

6
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@ -52,6 +52,12 @@
| [HADOOP-1650](https://issues.apache.org/jira/browse/HADOOP-1650) | Upgrade Jetty to 6.x | Major | . | Devaraj Das | Chris Douglas |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

4
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.20.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
@ -306,7 +306,7 @@ Removed deprecated method parseArgs from org.apache.hadoop.fs.FileSystem.
* [HADOOP-3497](https://issues.apache.org/jira/browse/HADOOP-3497) | *Major* | **File globbing with a PathFilter is too restrictive**
Changed the semantics of file globbing with a PathFilter (using the globStatus method of FileSystem). Previously, the filtering was too restrictive, so that a glob of /*/* and a filter that only accepts /a/b would not have matched /a/b. With this change /a/b does match.
Changed the semantics of file globbing with a PathFilter (using the globStatus method of FileSystem). Previously, the filtering was too restrictive, so that a glob of /\*/\* and a filter that only accepts /a/b would not have matched /a/b. With this change /a/b does match.
---

6
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@ -28,6 +28,12 @@
| [HADOOP-5726](https://issues.apache.org/jira/browse/HADOOP-5726) | Remove pre-emption from the capacity scheduler code base | Major | . | Hemanth Yamijala | rahul k singh |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

6
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.20.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
@ -46,7 +46,7 @@ Post HADOOP-4372, empty job history files caused NPE. This issues fixes that by
* [HADOOP-5921](https://issues.apache.org/jira/browse/HADOOP-5921) | *Major* | **JobTracker does not come up because of NotReplicatedYetException**
Jobtracker crashes if it fails to create jobtracker.info file (i.e if sufficient datanodes are not up). With this patch it keeps on retrying on IOExceptions assuming IOExceptions in jobtracker.info creation implies that the hdfs is not in *ready *state.
Jobtracker crashes if it fails to create jobtracker.info file (i.e if sufficient datanodes are not up). With this patch it keeps on retrying on IOExceptions assuming IOExceptions in jobtracker.info creation implies that the hdfs is not in \*ready \*state.
---
@ -142,7 +142,7 @@ Job initialization process was changed to not change (run) states during initial
- this can lead to deadlock as state changes require circular locking (i.e JobInProgress requires JobTracker lock)
- events were not raised as these state changes were not informed/propogated back to the JobTracker
Now the JobTracker takes care of initializing/failing/killing the job and raising appropriate events. The simple rule that was enforced was that "The JobTracker lock is *must* before changing the run-state of a job".
Now the JobTracker takes care of initializing/failing/killing the job and raising appropriate events. The simple rule that was enforced was that "The JobTracker lock is \*must\* before changing the run-state of a job".
---

6
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@ -27,6 +27,12 @@
| [HDFS-793](https://issues.apache.org/jira/browse/HDFS-793) | DataNode should first receive the whole packet ack message before it constructs and sends its own ack message for the packet | Blocker | datanode | Hairong Kuang | Hairong Kuang |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.20.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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@ -26,6 +26,12 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

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-->
# Apache Hadoop 0.20.203.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
@ -73,10 +73,10 @@ Configuration changes:
This patch does four things:
* it changes the directory structure of the done directory that holds history logs for jobs that are completed,
* it builds toy databases for completed jobs, so we no longer have to scan 2N files on DFS to find out facts about the N jobs that have completed since the job tracker started [which can be hundreds of thousands of files in practical cases],
* it changes the job history browser to display more information and allow more filtering criteria, and
* it creates a new programmatic interface for finding files matching user-chosen criteria. This allows users to no longer be concerned with our methods of storing them, in turn allowing us to change those at will.
\* it changes the directory structure of the done directory that holds history logs for jobs that are completed,
\* it builds toy databases for completed jobs, so we no longer have to scan 2N files on DFS to find out facts about the N jobs that have completed since the job tracker started [which can be hundreds of thousands of files in practical cases],
\* it changes the job history browser to display more information and allow more filtering criteria, and
\* it creates a new programmatic interface for finding files matching user-chosen criteria. This allows users to no longer be concerned with our methods of storing them, in turn allowing us to change those at will.
The new API described above, which can be used to programmatically obtain history file PATHs given search criteria, is described below:

8
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-->
# Apache Hadoop Changelog
## Release 0.20.203.1 - Unreleased
## Release 0.20.203.1 - Unreleased (as of 2016-03-04)
### INCOMPATIBLE CHANGES:
@ -26,6 +26,12 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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@ -18,7 +18,7 @@
-->
# Apache Hadoop 0.20.203.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

6
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| [HADOOP-6255](https://issues.apache.org/jira/browse/HADOOP-6255) | Create an rpm integration project | Major | . | Owen O'Malley | Eric Yang |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.20.204.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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@ -29,6 +29,12 @@
| [HDFS-630](https://issues.apache.org/jira/browse/HDFS-630) | In DFSOutputStream.nextBlockOutputStream(), the client can exclude specific datanodes when locating the next block. | Major | hdfs-client, namenode | Ruyue Ma | Cosmin Lehene |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.20.205.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

8
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@ -18,7 +18,7 @@
-->
# Apache Hadoop Changelog
## Release 0.20.3 - Unreleased
## Release 0.20.3 - Unreleased (as of 2016-03-04)
### INCOMPATIBLE CHANGES:
@ -29,6 +29,12 @@
| [HDFS-132](https://issues.apache.org/jira/browse/HDFS-132) | Namenode in Safemode reports to Simon non-zero number of deleted files during startup | Minor | namenode | Hairong Kuang | Suresh Srinivas |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

2
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-->
# Apache Hadoop 0.20.3 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---

6
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@ -107,6 +107,12 @@
| [MAPREDUCE-157](https://issues.apache.org/jira/browse/MAPREDUCE-157) | Job History log file format is not friendly for external tools. | Major | . | Owen O'Malley | Jothi Padmanabhan |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |

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-->
# Apache Hadoop 0.21.0 Release Notes
These release notes cover new developer and user-facing incompatibilities, features, and major improvements.
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
@ -503,7 +503,7 @@ Jars passed to the -libjars option of hadoop jars are no longer unpacked inside
* [HADOOP-5144](https://issues.apache.org/jira/browse/HADOOP-5144) | *Major* | **manual way of turning on restore of failed storage replicas for namenode**
New DFSAdmin command -restoreFailedStorage true|false|check sets policy for restoring failed fsimage/editslog volumes.
New DFSAdmin command -restoreFailedStorage true\|false\|check sets policy for restoring failed fsimage/editslog volumes.
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@ -1624,7 +1624,7 @@ Fixed TaskTracker and related classes so as to set correct and most restrictive
$mapred.local.dir
`-- taskTracker
`-- $user
|- distcache
\|- distcache
`-- jobcache
- Distributed cache files/archives are now user-owned by the job-owner and the group-owned by the special group-owner of the task-controller binary. The files/archives are set most private permissions possible, and as soon as possible, immediately after the files/dirs are first localized on the TT.
- As depicted by the new directory structure, a directory corresponding to each user is created on each TT when that particular user's first task are assigned to the corresponding TT. These user directories remain on the TT forever are not cleaned when unused, which is targeted to be fixed via MAPREDUCE-1019.
@ -1951,7 +1951,7 @@ Added a new target 'test-commit' to the build.xml file which runs tests specifie
* [MAPREDUCE-656](https://issues.apache.org/jira/browse/MAPREDUCE-656) | *Major* | **Change org.apache.hadoop.mapred.SequenceFile\* classes to use new api**
Ports the SequenceFile* classes to the new Map/Reduce API
Ports the SequenceFile\* classes to the new Map/Reduce API
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@ -2224,7 +2224,7 @@ Only one MR cluster is brought up and hence there is no scope of jobid clashing.
* [MAPREDUCE-144](https://issues.apache.org/jira/browse/MAPREDUCE-144) | *Major* | **TaskMemoryManager should log process-tree's status while killing tasks.**
Modified TaskMemoryManager so that it logs a map/reduce task's process-tree's status just before it is killed when it grows out of its configured memory limits. The log dump is in the format " |- PID PPID PGRPID SESSID CMD\_NAME VMEM\_USAGE(BYTES) FULL\_CMD\_LINE".
Modified TaskMemoryManager so that it logs a map/reduce task's process-tree's status just before it is killed when it grows out of its configured memory limits. The log dump is in the format " \|- PID PPID PGRPID SESSID CMD\_NAME VMEM\_USAGE(BYTES) FULL\_CMD\_LINE".
This is useful for debugging the cause for a map/reduce task and it's corresponding process-tree to be killed by the TaskMemoryManager.

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