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| <h1>Apache Hadoop 3.0.4 Release Notes</h1> |
| <p>These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.</p><hr /> |
| <ul> |
| |
| <li><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-15252">HADOOP-15252</a> | <i>Major</i> | <b>Checkstyle version is not compatible with IDEA’s checkstyle plugin</b></li> |
| </ul> |
| <p>Updated checkstyle to 8.8 and updated maven-checkstyle-plugin to 3.0.0.</p><hr /> |
| <ul> |
| |
| <li><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-15506">HADOOP-15506</a> | <i>Minor</i> | <b>Upgrade Azure Storage Sdk version to 7.0.0 and update corresponding code blocks</b></li> |
| </ul> |
| <p>WASB: Fix Spark process hang at shutdown due to use of non-daemon threads by updating Azure Storage Java SDK to 7.0</p><hr /> |
| <ul> |
| |
| <li><a class="externalLink" href="https://issues.apache.org/jira/browse/HDFS-13174">HDFS-13174</a> | <i>Major</i> | <b>hdfs mover -p /path times out after 20 min</b></li> |
| </ul> |
| <p>Mover could have fail after 20+ minutes if a block move was enqueued for this long, between two DataNodes due to an internal constant that was introduced for Balancer, but affected Mover as well. The internal constant can be configured with the dfs.balancer.max-iteration-time parameter after the patch, and affects only the Balancer. Default is 20 minutes.</p><hr /> |
| <ul> |
| |
| <li><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-15638">HADOOP-15638</a> | <i>Major</i> | <b>KMS Accept Queue Size default changed from 500 to 128 in Hadoop 3.x</b></li> |
| </ul> |
| <p>Restore the KMS accept queue size to 500 in Hadoop 3.x, making it the same as in Hadoop 2.x.</p> |
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