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Re: Status of CheckpointNode and BackupNode - HDFS - [mail # dev]
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...It's been 10 days or so: Eli, do you want to file a JIRA to remove this code? Do we need to call a vote of any kind, or is this treated as a code change where the normal processes appl...
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Author: Todd Lipcon,
2012-10-26, 14:39
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Re: need some help understanding NN quorum edit log - HDFS - [mail # dev]
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...Yep, that's right. -Todd On Wed, Oct 24, 2012 at 4:58 PM, Sujee Maniyam wrote: Todd Lipcon Software Engineer, Cloudera...
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Author: Todd Lipcon,
2012-10-25, 00:55
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Re: need some help understanding NN quorum edit log - HDFS - [mail # dev]
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...Hi Sujee, QuorumJournalManager implements the JournalManager interface. The javadoc on JournalManager may help you understand. Also, I would recommend understanding the local-disk impl...
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Author: Todd Lipcon,
2012-10-23, 23:49
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[HDFS-4025] QJM: Sychronize past log segments to JNs that missed them - HDFS - [issue]
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...Currently, if a JournalManager crashes and misses some segment of logs, and then comes back, it will be re-added as a valid part of the quorum on the next log roll. However, it will not have...
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http://issues.apache.org/jira/browse/HDFS-4025
Author: Todd Lipcon,
2012-10-19, 18:52
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[HDFS-2872] Add sanity checks during edits loading that generation stamps are non-decreasing - HDFS - [issue]
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...In 0.23 and later versions, we have a txid per edit, and the loading process verifies that there are no gaps. Lacking this in 1.0, we can use generation stamps as a proxy - the OP_SET_GENERA...
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http://issues.apache.org/jira/browse/HDFS-2872
Author: Todd Lipcon,
2012-10-17, 19:27
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[HDFS-2877] If locking of a storage dir fails, it will remove the other NN's lock file on exit - HDFS - [issue]
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...In Storage.tryLock(), we call lockF.deleteOnExit() regardless of whether we successfully lock the directory. So, if another NN has the directory locked, then we'll fail to lock it the first ...
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http://issues.apache.org/jira/browse/HDFS-2877
Author: Todd Lipcon,
2012-10-17, 19:27
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[HDFS-3330] If GetImageServlet throws an Error or RTE, response has HTTP "OK" status - HDFS - [issue]
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...Currently in GetImageServlet, we catch Exception but not other Errors or RTEs. So, if the code ends up throwing one of these exceptions, the "response.sendError()" code doesn't run, but the ...
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http://issues.apache.org/jira/browse/HDFS-3330
Author: Todd Lipcon,
2012-10-17, 19:27
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[HDFS-3678] Edit log files are never being purged from 2NN - HDFS - [issue]
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...Seeing the following NPE in the SecondaryNameNode when it tries to purge storage after a checkpoint:12/07/17 19:05:22 WARN namenode.FSImage: Unable to purge old storagejava.lang.NullPointerE...
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http://issues.apache.org/jira/browse/HDFS-3678
Author: Todd Lipcon,
2012-10-17, 14:21
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[HDFS-4049] hflush performance regression due to nagling delays - HDFS - [issue]
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...HDFS-3721 reworked the way that packets are mirrored through the pipeline in the datanode. This caused two write() calls where there used to be one, which interacts badly with nagling so tha...
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http://issues.apache.org/jira/browse/HDFS-4049
Author: Todd Lipcon,
2012-10-17, 14:21
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Re: Status of CheckpointNode and BackupNode - HDFS - [mail # dev]
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...Agreed, it's been a maintenance burden, and no one using it or actively maintaining it (except for those of us working on other areas of the code who have to spend time maintaining it). &nbs...
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Author: Todd Lipcon,
2012-10-15, 20:26
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