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Additional check when unpacking archives. Contributed by Jason Lowe and Akira Ajisaka.

HDFS-13601. Optimize ByteString conversions in PBHelper.

HADOOP-15450. Avoid fsync storm triggered by DiskChecker and handle disk full situation. Contributed by Arpit Agarwal.

(cherry picked from commit bcc8e76badc1341a6cf995c8e44fa5e422158de8)

YARN-7900. [AMRMProxy] AMRMClientRelayer for stateful FederationInterceptor. (Botong Huang via asuresh)

Skip the proxy user check if the ugi has not been initialized. Contributed by Daryn Sharp

(cherry picked from commit 73e9120ad79c73703de21e0084591861813f3279)

HADOOP-15478. WASB: hflush() and hsync() regression. Contributed by Thomas Marquardt.

(cherry picked from commit ba842847c94d31d3f737226d954c566b5d88656b)

HDFS-13590. Backport HDFS-12378 to branch-2. Contributed by Lukas Majercak.

HDFS-13593. TestBlockReaderLocalLegacy#testBlockReaderLocalLegacyWithAppend fails on Windows. Contributed by Anbang Hu.

(cherry picked from commit 9775ecb2355d7bed3514fcd54bf69e8351c4ab99)

HDFS-13592. TestNameNodePrunesMissingStorages#testNameNodePrunesUnreportedStorages does not shut down cluster properly. Contributed by Anbang Hu.

(cherry picked from commit 57b893de3d36d20f65ee81b5cc3cfef12594b75b)

HDFS-13586. Fsync fails on directories on Windows. Contributed by Lukas Majercack.

(cherry picked from commit 8783613696674aba4ae1739c6e8f48cda0d1c386)

HDFS-13560. Insufficient system resources exist to complete the requested service for some tests on Windows. Contributed by Anbang Hu.

(cherry picked from commit 53b807a6a8486cefe0b036f7893de9f619bd44a1)

HDFS-13556. TestNestedEncryptionZones does not shut down cluster. Contributed by Anbang Hu.

(cherry picked from commit a97a2042f210e9db97646baad6f56064d672f447)

HDFS-13554. TestDatanodeRegistration#testForcedRegistration does not shut down cluster. Contributed by Anbang Hu.

(cherry picked from commit 65476458fa05656010809be632356e4015b59a17)

HDFS-13558. TestDatanodeHttpXFrame does not shut down cluster. Contributed by Anbang Hu.

(cherry picked from commit 26f1e22fc9ee326e9c76503d347552faeb6c2d3b)

HDFS-13570. TestQuotaByStorageType,TestQuota,TestDFSOutputStream fail on Windows. Contributed by Anbang Hu.

(cherry picked from commit c0ec061e280c0d3e5299c0735c8b8697e0f31216)

HDFS-13581. DN UI logs link is broken when https is enabled. Contributed by Shashikant Banerjee.

(cherry picked from commit 0ce6290de6a08beab01cb5184d366d97c9abd811)

HDFS-13559. TestBlockScanner does not close TestContext properly. Contributed by Anbang Hu.

(cherry picked from commit 454de3b543c8b00a9ab566c7d1c64d7e4cffee0f)

HDFS-13550.TestDebugAdmin#testComputeMetaCommand fails on Windows. Contributed by Anbang Hu.

(cherry picked from commit 55d5549087183cb9c8d805e33267acabe9537667)

HDFS-13557. TestDFSAdmin#testListOpenFiles fails on Windows. Contributed by Anbang Hu.

YARN-8249. Few REST api's in RMWebServices are missing static user check. Contributed by Sunil G.

HDFS-13567. TestNameNodeMetrics#testGenerateEDEKTime,TestNameNodeMetrics#testResourceCheck should use a different cluster basedir. Contributed by Anbang Hu.

(cherry picked from commit 63480976a008bab0b84f4da08b1099867e5a9a6b)

HDFS-13548. TestResolveHdfsSymlink#testFcResolveAfs fails on Windows. Contributed by Anbang Hu.

(cherry picked from commit 2d6195c0af4a1840172899ce70bca4ca549eb713)

HDFS-11700. TestHDFSServerPorts#testBackupNodePorts doesn't pass on Windows. Contributed by Anbang Hu.

(cherry picked from commit eaca7980ad2a750f6b0025a706062740c2ddded2)

HDFS-13551. TestMiniDFSCluster#testClusterSetStorageCapacity does not shut down cluster. Contributed by Anbang Hu.

(cherry picked from commit 92ebd466c75275118107e6ec665cf50e337a29e7)

YARN-8130 Race condition when container events are published for KILLED applications. (Rohith Sharma K S via Haibo Chen)

(cherry picked from commit 2d00a0c71b5dde31e2cf8fcb96d9d541d41fb879)

HDFS-13544. Improve logging for JournalNode in federated cluster.

(cherry picked from commit 6beb25ab7e4f5454dba0315a296081e61753f301)

Add 2.9.1 release notes and changes documents

HADOOP-15441. Log kms url and token service at debug level. Contributed by Gabor Bota

(cherry picked from commit a5449d36312c3de953e05ba8b3b5acf818a0c7e7)

YARN-8244. TestContainerSchedulerQueuing.testStartMultipleContainers failed. Contributed by Jim Brennan

(cherry picked from commit dc912994a1bcb511dfda32a0649cef0c9bdc47d3)

HDFS-13542. TestBlockManager#testNeededReplicationWhileAppending fails due to improper cluster shutdown in TestBlockManager#testBlockManagerMachinesArray on Windows. Contributed by Anbang Hu.