Bulk Operation

HDFS-6581 Support using ramfs partitions on Linux

HDFS-6581 Persist in-memory replicas with appropriate unbuffered copy API on POSIX and Windows

HDFS-6581 DN should ignore lazyPersist hint if the writer is not local

HDFS-6581 Fix Jenkins failures in HDFS-6581 branch

HDFS-6581 DFSOutputStream should query policies from NameNode

HDFS-6581 Feature documentation for HDFS-6581

HDFS-6581 Fix incorrect layout version caused by bad merge

HDFS-6581 Use block storage policy to set lazy persist preference

HDFS-6581 Bugfix in createLocatedFileStatus caused by bad merge

HDFS-6581 Fix findbugs warnings in RamDiskReplicaTracker

HDFS-6581 Fix findbugs warnings in HDFS-6581 branch

HDFS-6581 Implement a 2Q eviction strategy for HDFS-6581

HDFS-6581 Integrate HDFS-6581 memory usage with HDFS-4949

HDFS-6581 Metrics to track usage of memory for writes

HDFS-6581 LazyWriter should use either async IO or one thread per physical disk

HDFS-6581 Fix unit test failures in SimulatedFsDataset

HDFS-6581 Make eviction scheme pluggable

HDFS-6581 Add forwarding constructor for INodeFile for existing callers

HDFS-6581 Use unbuffered writes when persisting in-memory replicas

HDFS-6581 Fix findbugs warnings in the HDFS-6581 branch

HDFS-6581 FsDatasetImpl#copyBlockFiles debug log can be improved

HDFS-6581 Fix finalize and upgrade unit test failures

HDFS-6581 Few more unit test fixes for HDFS-6581

HDFS-6581 Updated editsStored and editsStored.xml to bump layout version and add LazyPersist flag

HDFS-6581 LazyWriter#evictBlocks misses a null check for replicaState

HDFS-6581 Fix unit test failures in HDFS-6581 branch

HDFS-6581 Notify NN of evicted block before deleting it from RAM disk

HDFS-6581 Add unit test for evict/delete RAM_DISK block with open handle

HDFS-6581 Improve HDFS-6581 eviction configuration

HDFS-6581 Directory scanner should correctly reconcile blocks on RAM disk

HDFS-6581 Delete all copies when a block is deleted from the block space

HDFS-6581 Bugfix in LazyWriter, fix test case and some refactoring

HDFS-6581 Add Additional unit tests for HDFS-6581

HDFS-6581 The HttpFSFileSystem should also return the isLazyPersist flag in the FileStatus

HDFS-6581 Move checksum computation off the hot path when writing to RAM disk

HDFS-6581 Skip checksum verification when reading from memory

HDFS-6581 Balancer and Mover tools should ignore replicas on RAM_DISK

HDFS-6581 Move lazily persisted replicas to finalized directory on DN startup

HDFS-6581 Improve replica eviction from RAM disk

HDFS-6581 NN periodically unlinks lazy persist files with missing replicas from namespace

HDFS-6581 'hdfs put' command should accept lazyPersist flag for testing

HDFS-6581 Add unit tests

HDFS-6581 DN support for saving replicas to persistent storage and evicting in-memory replicas

HDFS-6581 DataNode should attempt to place replicas on transient storage first if lazyPersist flag is received

HDFS-6581 Add new RAM_DISK storage type

HDFS-6581 Propagate LazyPersist flag to DNs via DataTransferProtocol

HDFS-6581 Add LazyPersist flag to INodeFile, save it in FsImage and edit logs

HDFS-6581 Add LazyPersist flag to FileStatus

HDFS-6581 Investigate eviction from RAM disk via file truncation

HDFS-6581 Initial prototype implementation for replicas in memory using tmpfs