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[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, 2013-08-27, 23:08
[HDFS-4982] JournalNode should relogin from keytab before fetching logs from other JNs - HDFS - [issue]
...We've seen an issue in a secure cluster where, after a failover, the new NN isn't able to properly coordinate QJM recovery. The JNs fail to fetch logs from each other due to apparently not h...
http://issues.apache.org/jira/browse/HDFS-4982    Author: Todd Lipcon, 2013-08-27, 23:08
[HDFS-2627] HA: determine DN's view of which NN is active based on heartbeat responses - HDFS - [issue]
...This is the first part of the design described in this comment in HDFS-1972. When the DNs start, they should not consider either of the NNs in a block pool to be the active one. Rather, the ...
http://issues.apache.org/jira/browse/HDFS-2627    Author: Todd Lipcon, 2013-08-23, 01:28
Re: Secure deletion of blocks - HDFS - [mail # dev]
...Hi Matt,  I'd also recommend implementing this in a somewhat pluggable way -- eg a configuration for a Deleter class. The default Deleter can be the one we use today which just removes ...
   Author: Todd Lipcon, 2013-08-15, 21:17
[HDFS-3656] ZKFC may write a null "breadcrumb" znode - HDFS - [issue]
...A user reported an NPE trying to read the "breadcrumb" znode in the failover controller. This happened repeatedly, implying that an earlier process set the znode to null - probably some race...
http://issues.apache.org/jira/browse/HDFS-3656    Author: Todd Lipcon, 2013-08-14, 22:24
[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, 2013-08-14, 15:33
[HDFS-3020] Auto-logSync based on edit log buffer size broken - HDFS - [issue]
...HDFS-1112 added a feature whereby the edit log automatically calls logSync() if the buffered data crosses a threshold. However, the code checks bufReady.size() rather than bufCurrent.size() ...
http://issues.apache.org/jira/browse/HDFS-3020    Author: Todd Lipcon, 2013-08-10, 12:33
Re: Feature request to provide DFSInputStream subclassing mechanism - HDFS - [mail # dev]
...Hi Jeff,  Do you need to subclass or could you simply wrap? Generally composition as opposed to inheritance is a lot safer way of integrating software written by different parties, sinc...
   Author: Todd Lipcon, 2013-08-07, 18:25
[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, 2013-08-06, 21:08
[HDFS-3053] Support for true zero-copy (mmap-based) reads - HDFS - [issue]
...Continuing a discussion started in HDFS-2834, it would be slick to provide support for a true zero-copy read API. In this style API, rather than having the user pass buffers to read into, th...
http://issues.apache.org/jira/browse/HDFS-3053    Author: Todd Lipcon, 2013-07-29, 03:03
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