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[HDFS-3528] Use native CRC32 in DFS write path - HDFS - [issue]
...HDFS-2080 improved the CPU efficiency of the read path by using native SSE-enabled code for CRC verification. Benchmarks of the write path show that it's often CPU bound by checksums as well...
http://issues.apache.org/jira/browse/HDFS-3528    Author: Todd Lipcon, 2014-09-05, 10:45
[HDFS-3755] Creating an already-open-for-write file with overwrite=true fails - HDFS - [issue]
...If a file is already open for write by one client, and another client calls fs.create() with overwrite=true, the file should be deleted and the new file successfully created. Instead, it is ...
http://issues.apache.org/jira/browse/HDFS-3755    Author: Todd Lipcon, 2014-09-04, 01:59
[HDFS-3796] Speed up edit log tests by avoiding fsync() - HDFS - [issue]
...Our edit log tests are very slow because they incur a lot of fsyncs as they write out transactions. Since fsync() has no effect except in the case of power outages or system crashes, and we ...
http://issues.apache.org/jira/browse/HDFS-3796    Author: Todd Lipcon, 2014-09-04, 01:59
[HDFS-3190] Simple refactors in existing NN code to assist QuorumJournalManager extension - HDFS - [issue]
...This JIRA is for some simple refactors in the NN: refactor the code which writes the seen_txid file in NNStorage into a new "LongContainingFile" utility class. This is useful for the Journal...
http://issues.apache.org/jira/browse/HDFS-3190    Author: Todd Lipcon, 2014-09-04, 01:59
[HDFS-3245] Add metrics and web UI for cluster version summary - HDFS - [issue]
...With the introduction of protocol compatibility, once HDFS-2983 is committed, we have the possibility that different nodes in a cluster are running different software versions. To aid operat...
http://issues.apache.org/jira/browse/HDFS-3245    Author: Todd Lipcon, 2014-09-04, 00:49
[HDFS-3626] Creating file with invalid path can corrupt edit log - HDFS - [issue]
...Joris Bontje reports the following:The following command results in a corrupt NN editlog (note the double slash and reading from stdin):$ cat /usr/share/dict/words | hadoop fs -put - hdfs://...
http://issues.apache.org/jira/browse/HDFS-3626    Author: Todd Lipcon, 2014-09-04, 00:21
[HDFS-4182] SecondaryNameNode leaks NameCache entries - HDFS - [issue]
...We recently saw an issue where a 2NN ran out of memory, even though it had a relatively small fsimage. When we looked at the heap dump, we saw that all of the memory had gone to entries in t...
http://issues.apache.org/jira/browse/HDFS-4182    Author: Todd Lipcon, 2014-09-04, 00:19
[HDFS-3077] Quorum-based protocol for reading and writing edit logs - HDFS - [issue]
...Currently, one of the weak points of the HA design is that it relies on shared storage such as an NFS filer for the shared edit log. One alternative that has been proposed is to depend on Bo...
http://issues.apache.org/jira/browse/HDFS-3077    Author: Todd Lipcon, 2014-09-04, 00:05
[HDFS-3875] Issue handling checksum errors in write pipeline - HDFS - [issue]
...We saw this issue with one block in a large test cluster. The client is storing the data with replication level 2, and we saw the following: the second node in the pipeline detects a checksu...
http://issues.apache.org/jira/browse/HDFS-3875    Author: Todd Lipcon, 2014-09-04, 00:00
[HDFS-4128] 2NN gets stuck in inconsistent state if edit log replay fails in the middle - HDFS - [issue]
...We saw the following issue in a cluster: The 2NN downloads an edit log segment:2012-10-29 12:30:57,433 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Reading /xxxxxxx/current/edits_000...
http://issues.apache.org/jira/browse/HDFS-4128    Author: Todd Lipcon, 2014-09-03, 23:55
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