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[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
[HDFS-3694] QJM: Fix getEditLogManifest to fetch httpPort if necessary - HDFS - [issue]
...This is necessary for QJM to work with HA. When the NNs start up, they start in standby state and try to read from the JournalNodes. So they call getEditLogManifest(). But they don't call ge...
http://issues.apache.org/jira/browse/HDFS-3694    Author: Todd Lipcon, 2012-07-25, 21:40
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