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[HDFS-3741] QJM: exhaustive failure injection test for skipped RPCs - HDFS - [issue]
...This JIRA is to add a test case which exhaustively tests double-failure scenarios in a 3-node quorum setup. The test instruments the RPCs between the client and the JNs, and injects faults, ...
http://issues.apache.org/jira/browse/HDFS-3741    Author: Todd Lipcon, 2012-08-07, 20:24
[HDFS-1148] Convert FSDataset to ReadWriteLock - HDFS - [issue]
...In benchmarking HDFS-941 I noticed that for the random read workload, the FSDataset lock is highly contended. After converting it to a ReentrantReadWriteLock, I saw a ~25% improvement on bot...
http://issues.apache.org/jira/browse/HDFS-1148    Author: Todd Lipcon, 2012-08-07, 08:29
[HDFS-3767] Finer grained locking in DN - HDFS - [issue]
...In testing a high-write-throughput workload, I see the DN maintain good performance most of the time, except that occasionally one thread will block for a few seconds in finalizeReplica. It ...
http://issues.apache.org/jira/browse/HDFS-3767    Author: Todd Lipcon, 2012-08-07, 08:29
[HDFS-3697] Enable fadvise readahead by default - HDFS - [issue]
...The fadvise features have been implemented for some time, and we've enabled them in production at a lot of customer sites without difficulty. I'd like to enable the readahead feature by defa...
http://issues.apache.org/jira/browse/HDFS-3697    Author: Todd Lipcon, 2012-08-04, 16:12
[HDFS-3743] QJM: improve formatting behavior for JNs - HDFS - [issue]
...Currently, the JournalNodes automatically format themselves when a new writer takes over, if they don't have any data for that namespace. However, this has a few problems:1) if the administr...
http://issues.apache.org/jira/browse/HDFS-3743    Author: Todd Lipcon, 2012-07-31, 18:16
[HDFS-3725] Fix QJM startup when individual JNs have gaps - HDFS - [issue]
...This fixes a bug in the HDFS-3077 branch:If one of the JNs goes down and comes back up, it may have a discontiguous set of logs in its storage directories. This means that a future getEditLo...
http://issues.apache.org/jira/browse/HDFS-3725    Author: Todd Lipcon, 2012-07-30, 23:36
Re: Test failed when compiling Trunk - HDFS - [mail # user]
...Hi Clement,  Can you try boosting the timeout for this test case to a higher value? I wonder if your machine is just slower than the ones which we developed the test on originally? &nbs...
   Author: Todd Lipcon, 2012-07-29, 20:53
[HDFS-2533] Remove needless synchronization on FSDataSet.getBlockFile - HDFS - [issue]
...HDFS-1148 discusses lock contention issues in FSDataset. It provides a more comprehensive fix, converting it all to RWLocks, etc. This JIRA is for one very specific fix which gives a decent ...
http://issues.apache.org/jira/browse/HDFS-2533    Author: Todd Lipcon, 2012-07-26, 04:50
[HDFS-3693] QJM: JNStorage should read its storage info even before a writer becomes active - HDFS - [issue]
...In order for QJM to work with HA, the standby needs to be able to read from a JournalNode even when no active has written to it. In the current code, it reads the StorageInfo only when newEp...
http://issues.apache.org/jira/browse/HDFS-3693    Author: Todd Lipcon, 2012-07-25, 21:47
[HDFS-3692] QJM: support purgeEditLogs() call to remotely purge logs - HDFS - [issue]
...This API is currently marked TODO. We need it to maintain bounded disk space usage on the JournalNode storage....
http://issues.apache.org/jira/browse/HDFS-3692    Author: Todd Lipcon, 2012-07-25, 21:46
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