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[HDFS-6658] Namenode memory optimization - Block replicas list - HDFS - [issue]
...Part of the memory consumed by every BlockInfo object in the Namenode is a linked list of block references for every DatanodeStorageInfo (called "triplets"). We propose to change the way we ...
http://issues.apache.org/jira/browse/HDFS-6658    Author: Amir Langer, 2014-10-21, 08:27
[HDFS-7244] Reduce Namenode memory using Flyweight pattern - HDFS - [issue]
...Using the flyweight pattern can dramatically reduce memory usage in the Namenode. The pattern also abstracts the actual storage type and allows the decision of whether it is off-heap or not ...
http://issues.apache.org/jira/browse/HDFS-7244    Author: Amir Langer, 2014-10-21, 08:13
[HDFS-3107] HDFS truncate - HDFS - [issue]
...Systems with transaction support often need to undo changes made to the underlying storage when a transaction is aborted. Currently HDFS does not support truncate (a standard Posix operation...
http://issues.apache.org/jira/browse/HDFS-3107    Author: Lei Chang, 2014-10-21, 07:54
[HDFS-7254] Add documents for hot swap drive - HDFS - [issue]
...Add documents for the hot swap drive functionality....
http://issues.apache.org/jira/browse/HDFS-7254    Author: Lei, 2014-10-21, 07:08
[HDFS-7056] Snapshot support for truncate - HDFS - [issue]
...Implementation of truncate in HDFS-3107 does not allow truncating files which are in a snapshot. It is desirable to be able to truncate and still keep the old file state of the file in the s...
http://issues.apache.org/jira/browse/HDFS-7056    Author: Konstantin Shvachko, 2014-10-21, 06:46
[HDFS-7225] Failed DataNode lookup can crash NameNode with NullPointerException - HDFS - [issue]
...BlockManager#invalidateWorkForOneNode looks up a DataNode by the datanodeUuid and passes the resultant DatanodeDescriptor to InvalidateBlocks#invalidateWork. However, if a wrong or outdated ...
http://issues.apache.org/jira/browse/HDFS-7225    Author: Zhe Zhang, 2014-10-21, 05:58
[HDFS-3342] SocketTimeoutException in BlockSender.sendChunks could have a better error message - HDFS - [issue]
...Currently, if a client connects to a DN and begins to read a block, but then stops calling read() for a long period of time, the DN will log a SocketTimeoutException "480000 millis timeout w...
http://issues.apache.org/jira/browse/HDFS-3342    Author: Todd Lipcon, 2014-10-21, 05:48
[HDFS-7243] HDFS concat operation should not be allowed in Encryption Zone - HDFS - [issue]
...For HDFS encryption at rest, files in an encryption zone are using different data encryption keys, so concat should be disallowed....
http://issues.apache.org/jira/browse/HDFS-7243    Author: Yi Liu, 2014-10-21, 05:48
[HDFS-7269] NN and DN don't check whether corrupted blocks reported by clients are actually corrupted - HDFS - [issue]
...We had a case where the client machine had memory issue and thus failed the checksum validation of a given block for all its replicas. So the client ended up informing NN about the corrupted...
http://issues.apache.org/jira/browse/HDFS-7269    Author: Ming Ma, 2014-10-21, 04:59
[HDFS-7271] Find a way to make encryption zone deletion work with HDFS trash. - HDFS - [issue]
...Currently when HDFS trash is enabled, deletion of encryption zone will have issue:rmr: Failed to move to trash: ... can't be moved from an encryption zone.A simple way is to add ignore trash...
http://issues.apache.org/jira/browse/HDFS-7271    Author: Yi Liu, 2014-10-21, 04:51
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