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[HDFS-308] Improve TransferFsImage
...TransferFsImage transfers name-node image and edits files during checkpoint process. TransferFsImage should always pass and verify CheckpointSignature. Now we send it only when image is uplo...
, 2014-07-21, 22:59
[HDFS-346] Version file in name-node image directory should include "role" field.
...It would be useful to have name-node role field in the VERSION file in name-node's image and edits directories so that one could see what type of node created the image. Role was introduced ...
, 2014-07-21, 22:58
[HDFS-333] A State Machine for name-node blocks.
...Blocks on the name-node can belong to different collections like the blocksMap, under-replicated, over-replicated lists, etc.It is getting more and more complicated to keep the lists consist...
, 2014-07-21, 21:46
[HDFS-293] Remove code related to conversion of name-node and data-node storage directories to the format introduced in hadoop 0.13
...Hadoop 0.18 does not support direct HDFS upgrades from versions 0.13 or earlier as stated in HADOOP-2797.A 2 step upgrade is required in this case first from 0.x <= 0.13 to one of version...
, 2014-07-18, 06:39
[HDFS-171] Redundant error logging in FSNamesystem.
...HADOOP-3509 introduced a new error message which is logged if FSNamesystem fails to initialize. This message turned out to be redundant, because it should and is logged further up the stack ...
, 2014-07-18, 06:32
[HDFS-80] Rename of a directory with many opened files blocks name-node for a long time. changeLease() to blame.
...I am creating a directory containing 200,000 files, and then renaming it.The rename operation is twice as long as the the total time for creating all those files.The worst thing is that the ...
, 2014-07-18, 06:28
[HDFS-337] Name collision for AccessControlException.
...There is a name collision in org.apache.hadoop.fs.permission.AccessControlException and java.security.AccessControlException.Since java.security.AccessControlException is not an IOExce...
, 2014-07-17, 23:00
[HDFS-306] FSNamesystem.shutdown() should be a part of FSNamesystem.close()
...FSNamesystem should either close() or shutdown(), but not both.Traditionally we used to have FSNamesystem.close()....
, 2014-07-17, 22:43
[HDFS-2064] Warm HA NameNode going Hot
...This is the design for automatic hot HA for HDFS NameNode. It involves use of HA software and LoadReplicator - external to Hadoop components, which substantially simplify the architecture by...
, 2014-06-06, 02:11
[HDFS-6325] Append should fail if the last block has insufficient number of replicas
...Currently append() succeeds on a file with the last block that has no replicas. But the subsequent updatePipeline() fails as there are no replicas with the exception "Unable to retrieve bloc...
, 2014-05-20, 16:37
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