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[HDFS-8402] Fsck exit codes are not reliable
...HDFS-6663 added the ability to check specific blocks. The exit code is non-deterministically based on the state (corrupt, healthy, etc) of the last displayed block's last storage locat...
, 2016-08-17, 20:28
[HDFS-10342] BlockManager#createLocatedBlocks should not check corrupt replicas if none are corrupt
...corruptReplicas#isReplicaCorrupt(block, node) is called for every node while populating the machines array. There's no need to invoke the method if corruptReplicas#numCorruptReplicas(b...
, 2016-08-16, 14:41
[HDFS-10343] BlockManager#createLocatedBlocks may return blocks on failed storages
...Storage state is ignored when building the machines list. Failed storage removal is not immediate so clients may be directed to bad locations. The client recovers but it's less t...
, 2016-08-04, 20:40
[HDFS-7597] DelegationTokenIdentifier should cache the TokenIdentifier to UGI mapping
...Webhdfs seeks involve closing the current connection, and reissuing a new open request with the new offset. The RPC layer caches connections so the DN keeps a lingering connection open...
, 2016-07-28, 18:30
[HDFS-10653] Optimize conversion from path string to components
...Converting a path String to a byte currently requires an unnecessary intermediate conversion from String to String. Removing this will reduce excessive object allocation and byte...
, 2016-07-22, 17:07
[HDFS-9566] Remove expensive 'BlocksMap#getStorages(Block b, final DatanodeStorage.State state)' method
...HDFS-5318 added a BlocksMap#getStorages(Block, State) which is based on iterables and predicates. The method is very expensive compared to a simple comparison/continue....
, 2016-07-02, 01:34
[HDFS-7435] PB encoding of block reports is very inefficient
...Block reports are encoded as a PB repeating long. Repeating fields use an ArrayList with default capacity of 10. A block report containing tens or hundreds of thousand of longs (...
, 2016-06-23, 07:58
[HDFS-7005] DFS input streams do not timeout
...Input streams lost their timeout. The problem appears to be DFSClient#newConnectedPeer does not set the read timeout. During a temporary network interruption the server will clos...
, 2016-06-08, 02:50
[HDFS-7607] Use random rack-local node for webhdfs opens to avoid OOM on DNs
...Webhdfs currently redirects a client to the DN that physically has one of thereplicas. Unlike the hdfs data streamer protocol which can easily handle hundreds or thousands of connectio...
, 2016-06-05, 06:00
[HDFS-5946] Webhdfs DN choosing code is flawed
...HDFS-5891 improved the performance of redirecting webhdfs clients to a DN. Instead of attempting a connection with a 1-minute timeout, the NN skips decommissioned nodes.The logic appea...
, 2016-06-05, 05:59
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