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Re: confirm expected HA behavior - HDFS - [mail # dev]
...Hi Arpit,The issue here is that our transaction log is not a proper "write-aheadlog". In fact, it is a "write-behind" log of sorts -- our generaloperations look something like:- lock namespa...
   Author: Todd Lipcon, 2014-02-07, 19:48
Re: [VOTE] Merge HDFS-5698 Use protobuf to serialize / deserialize FSImage to trunk - HDFS - [mail # dev]
...One question - what's the intention with this work with regard to branch-2?Do you plan to merge it to branch-2, and if so, are you thinking for 2.4 orlater?I'm a little afraid of the diverge...
   Author: Todd Lipcon, 2014-01-30, 23:19
[HDFS-4305] Add a configurable limit on number of blocks per file, and min block size - HDFS - [issue]
...We recently had an issue where a user set the block size very very low and managed to create a single file with hundreds of thousands of blocks. This caused problems with the edit log since ...
http://issues.apache.org/jira/browse/HDFS-4305    Author: Todd Lipcon, 2014-01-28, 17:26
[HDFS-5790] LeaseManager.findPath is very slow when many leases need recovery - HDFS - [issue]
...We recently saw an issue where the NN restarted while tens of thousands of files were open. The NN then ended up spending multiple seconds for each commitBlockSynchronization() call, spendin...
http://issues.apache.org/jira/browse/HDFS-5790    Author: Todd Lipcon, 2014-01-27, 23:04
[HDFS-2994] If lease soft limit is recovered successfully the append can fail - HDFS - [issue]
...I saw the following logs on my test cluster:2012-02-22 14:35:22,887 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: startFile: recover lease [Lease.  Holder: DFSClient_attempt...
http://issues.apache.org/jira/browse/HDFS-2994    Author: Todd Lipcon, 2014-01-07, 18:42
[HDFS-5074] Allow starting up from an fsimage checkpoint in the middle of a segment - HDFS - [issue]
...We've seen the following behavior a couple times: SBN is running and somehow encounters an error in the middle of replaying an edit log in the tailer (eg the JN it's reading from crashes) SB...
http://issues.apache.org/jira/browse/HDFS-5074    Author: Todd Lipcon, 2013-12-11, 14:40
Re: Deprecate BackupNode - HDFS - [mail # dev]
...+1   On Wed, Dec 4, 2013 at 3:06 PM, Suresh Srinivas wrote:     Todd Lipcon Software Engineer, Cloudera...
   Author: Todd Lipcon, 2013-12-04, 23:14
[HDFS-2882] DN continues to start up, even if block pool fails to initialize - HDFS - [issue]
...I started a DN on a machine that was completely out of space on one of its drives. I saw the following:2012-02-02 09:56:50,499 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initiali...
http://issues.apache.org/jira/browse/HDFS-2882    Author: Todd Lipcon, 2013-12-03, 09:17
Re: Question regarding access to different hadoop 2.0 cluster - HDFS - [mail # dev]
...We've discussed a few times adding a FailoverProxyProvider which would use DNS records for this. For example, you'd add a SRV record (or multiple A records) for the logical name, pointing to...
   Author: Todd Lipcon, 2013-11-06, 19:40
BKJM - anyone using it? - HDFS - [mail # dev]
...Hey folks,  Is anyone using BKJM? The BookKeeper-based HA approach was developed around the same time as QuorumJournalManager, but I haven't seen much reported about it in the last year...
   Author: Todd Lipcon, 2013-11-05, 20:06
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