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< h1 > Apache Hadoop 3.1.2 Release Notes< / h1 >
< p > These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.< / p > < hr / >
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< 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 >
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< p > Restore the KMS accept queue size to 500 in Hadoop 3.x, making it the same as in Hadoop 2.x.< / p > < hr / >
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< li > < a class = "externalLink" href = "https://issues.apache.org/jira/browse/HADOOP-15677" > HADOOP-15677< / a > | < i > Major< / i > | < b > WASB: Add support for StreamCapabilities< / b > < / li >
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< p > WASB: Support for StreamCapabilities.< / p > < hr / >
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< li > < a class = "externalLink" href = "https://issues.apache.org/jira/browse/HADOOP-15684" > HADOOP-15684< / a > | < i > Critical< / i > | < b > triggerActiveLogRoll stuck on dead name node, when ConnectTimeoutException happens.< / b > < / li >
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< p > When a namenode A sends request RollEditLog to a remote NN, either the remote NN is standby or IO Exception happens, A should continue to try next NN, instead of getting stuck on the problematic one. This Patch is based on trunk.< / p > < hr / >
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< li > < a class = "externalLink" href = "https://issues.apache.org/jira/browse/HADOOP-14445" > HADOOP-14445< / a > | < i > Major< / i > | < b > Use DelegationTokenIssuer to create KMS delegation tokens that can authenticate to all KMS instances< / b > < / li >
< / ul > <!-- markdown -->
< p > This patch improves the KMS delegation token issuing and authentication logic, to enable tokens to authenticate with a set of KMS servers. The change is backport compatible, in that it keeps the existing authentication logic as a fall back.< / p >
< p > Historically, KMS delegation tokens have ip:port as service, making KMS clients only able to use the token to authenticate with the KMS server specified as ip:port, even though the token is shared among all KMS servers at server-side. After this patch, newly created tokens will have the KMS URL as service.< / p >
< p > A < code > DelegationTokenIssuer< / code > interface is introduced for token creation.< / p > < hr / >
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< li > < a class = "externalLink" href = "https://issues.apache.org/jira/browse/YARN-8986" > YARN-8986< / a > | < i > Minor< / i > | < b > publish all exposed ports to random ports when using bridge network< / b > < / li >
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< p > support -p and -P for bridge type network;< / p > < hr / >
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< li > < a class = "externalLink" href = "https://issues.apache.org/jira/browse/YARN-9071" > YARN-9071< / a > | < i > Critical< / i > | < b > NM and service AM don’ t have updated status for reinitialized containers< / b > < / li >
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< p > In progress upgrade status may show READY state sooner than actual upgrade operations. External caller to upgrade API is recommended to wait minimum 30 seconds before querying yarn app -status.< / p > < hr / >
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< li > < a class = "externalLink" href = "https://issues.apache.org/jira/browse/YARN-9084" > YARN-9084< / a > | < i > Major< / i > | < b > Service Upgrade: With default readiness check, the status of upgrade is reported to be successful prematurely< / b > < / li >
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< p > Improve transient container status accuracy for upgrade.< / p > < hr / >
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< li > < a class = "externalLink" href = "https://issues.apache.org/jira/browse/HADOOP-15996" > HADOOP-15996< / a > | < i > Major< / i > | < b > Plugin interface to support more complex usernames in Hadoop< / b > < / li >
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< p > This patch enables “ Hadoop” and “ MIT” as options for “ hadoop.security.auth_to_local.mechanism” and defaults to ‘ hadoop’ . This should be backward compatible with pre-HADOOP-12751.< / p >
< p > This is basically HADOOP-12751 plus configurable + extended tests.< / p >
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