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  # Apache Hadoop Changelog
  
  ## Release 1.0.1 - 2012-02-22
  
  ### INCOMPATIBLE CHANGES:
  
  | JIRA | Summary | Priority | Component | Reporter | Contributor |
  |:---- |:---- | :--- |:---- |:---- |:---- |
  | [HADOOP-7470](https://issues.apache.org/jira/browse/HADOOP-7470) | move up to Jackson 1.8.8 |  Minor | util | Steve Loughran | Enis Soztutar |
  | [HADOOP-8037](https://issues.apache.org/jira/browse/HADOOP-8037) | Binary tarball does not preserve platform info for native builds, and RPMs fail to provide needed symlinks for libhadoop.so |  Blocker | build | Matt Foley | Matt Foley |
  
  
  ### IMPROVEMENTS:
  
  | JIRA | Summary | Priority | Component | Reporter | Contributor |
  |:---- |:---- | :--- |:---- |:---- |:---- |
  | [MAPREDUCE-3184](https://issues.apache.org/jira/browse/MAPREDUCE-3184) | Improve handling of fetch failures when a tasktracker is not responding on HTTP |  Major | jobtracker | Todd Lipcon | Todd Lipcon |
  | [MAPREDUCE-3607](https://issues.apache.org/jira/browse/MAPREDUCE-3607) | Port missing new API mapreduce lib classes to 1.x |  Major | client | Tom White | Tom White |
  | [HADOOP-7987](https://issues.apache.org/jira/browse/HADOOP-7987) | Support setting the run-as user in unsecure mode |  Major | security | Devaraj Das | Jitendra Nath Pandey |
  | [HDFS-2814](https://issues.apache.org/jira/browse/HDFS-2814) | NamenodeMXBean does not account for svn revision in the version information |  Minor | . | Hitesh Shah | Hitesh Shah |
  | [HADOOP-8009](https://issues.apache.org/jira/browse/HADOOP-8009) | Create hadoop-client and hadoop-minicluster artifacts for downstream projects |  Critical | build | Alejandro Abdelnur | Alejandro Abdelnur |
  
  
  ### BUG FIXES:
  
  | JIRA | Summary | Priority | Component | Reporter | Contributor |
  |:---- |:---- | :--- |:---- |:---- |:---- |
  | [MAPREDUCE-3343](https://issues.apache.org/jira/browse/MAPREDUCE-3343) | TaskTracker Out of Memory because of distributed cache |  Major | mrv1 | Ahmed Radwan | yunjiong zhao |
  | [HADOOP-7960](https://issues.apache.org/jira/browse/HADOOP-7960) | Port HADOOP-5203 to branch-1, build version comparison is too restrictive |  Major | . | Giridharan Kesavan | Matt Foley |
  | [HADOOP-7964](https://issues.apache.org/jira/browse/HADOOP-7964) | Deadlock in class init. |  Blocker | security, util | Kihwal Lee | Daryn Sharp |
  | [HADOOP-7988](https://issues.apache.org/jira/browse/HADOOP-7988) | Upper case in hostname part of the principals doesn't work with kerberos. |  Major | . | Jitendra Nath Pandey | Jitendra Nath Pandey |
  | [HADOOP-8010](https://issues.apache.org/jira/browse/HADOOP-8010) | hadoop-config.sh spews error message when HADOOP\_HOME\_WARN\_SUPPRESS is set to true and HADOOP\_HOME is present |  Minor | scripts | Roman Shaposhnik | Roman Shaposhnik |
  | [HDFS-2379](https://issues.apache.org/jira/browse/HDFS-2379) | 0.20: Allow block reports to proceed without holding FSDataset lock |  Critical | datanode | Todd Lipcon | Todd Lipcon |
  | [HADOOP-8052](https://issues.apache.org/jira/browse/HADOOP-8052) | Hadoop Metrics2 should emit Float.MAX\_VALUE (instead of Double.MAX\_VALUE) to avoid making Ganglia's gmetad core |  Major | metrics | Varun Kapoor | Varun Kapoor |
  
  
  