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[HDFS-4617] warning while purging logs with QJM enabled - HDFS - [issue]
...HDFS-2946 changed the way that edit log purging is calculated, such that it calls selectInputStreams() with an arbitrary transaction ID calculated relative to the current one. The JournalNod...
http://issues.apache.org/jira/browse/HDFS-4617    Author: Todd Lipcon, 2013-03-28, 04:43
[HDFS-2554] Add separate metrics for missing blocks with desired replication level 1 - HDFS - [issue]
...Some users use replication level set to 1 for datasets which are unimportant and can be lost with no worry (eg the output of terasort tests). But other data on the cluster is important and s...
http://issues.apache.org/jira/browse/HDFS-2554    Author: Todd Lipcon, 2013-03-19, 18:53
[HDFS-4380] Opening a file for read before writer writes a block causes NPE - HDFS - [issue]
...JD Cryans found this issue: it seems like, if you open a file for read immediately after it's been created by the writer, after a block has been allocated, but before the block is created on...
http://issues.apache.org/jira/browse/HDFS-4380    Author: Todd Lipcon, 2013-03-13, 22:48
[HDFS-4304] Make FSEditLogOp.MAX_OP_SIZE configurable - HDFS - [issue]
...Today we ran into an issue where a NN had logged a very large op, greater than the 1.5MB MAX_OP_SIZE constant. In order to successfully load the edits, we had to patch with a larger constant...
http://issues.apache.org/jira/browse/HDFS-4304    Author: Todd Lipcon, 2013-02-23, 14:05
[HDFS-3077] Quorum-based protocol for reading and writing edit logs - HDFS - [issue]
...Currently, one of the weak points of the HA design is that it relies on shared storage such as an NFS filer for the shared edit log. One alternative that has been proposed is to depend on Bo...
http://issues.apache.org/jira/browse/HDFS-3077    Author: Todd Lipcon, 2013-02-08, 16:42
[HDFS-4182] SecondaryNameNode leaks NameCache entries - HDFS - [issue]
...We recently saw an issue where a 2NN ran out of memory, even though it had a relatively small fsimage. When we looked at the heap dump, we saw that all of the memory had gone to entries in t...
http://issues.apache.org/jira/browse/HDFS-4182    Author: Todd Lipcon, 2013-02-06, 17:05
[HDFS-3874] Exception when client reports bad checksum to NN - HDFS - [issue]
...We see the following exception in our logs on a cluster:2012-08-27 16:34:30,400 INFO org.apache.hadoop.hdfs.StateChange: *DIR* NameNode.reportBadBlocks2012-08-27 16:34:30,400 ERROR org.apach...
http://issues.apache.org/jira/browse/HDFS-3874    Author: Todd Lipcon, 2013-01-28, 18:41
[HDFS-4417] HDFS-347: fix case where local reads get disabled incorrectly - HDFS - [issue]
...In testing HDFS-347 against HBase (thanks Jean-Daniel Cryans) we ran into the following case: a workload is running which puts a bunch of local sockets in the PeerCache the workload abates f...
http://issues.apache.org/jira/browse/HDFS-4417    Author: Todd Lipcon, 2013-01-24, 20:24
[HDFS-4403] DFSClient can infer checksum type when not provided by reading first byte - HDFS - [issue]
...HDFS-3177 added the checksum type to OpBlockChecksumResponseProto, but the new protobuf field is optional, with a default of CRC32. This means that this API, when used against an older clust...
http://issues.apache.org/jira/browse/HDFS-4403    Author: Todd Lipcon, 2013-01-22, 14:04
[HDFS-4418] HDFS-347: increase default FileInputStreamCache size - HDFS - [issue]
...The FileInputStreamCache currently defaults to holding only 10 input stream pairs (corresponding to 10 blocks). In many HBase workloads, the region server will be issuing random reads agains...
http://issues.apache.org/jira/browse/HDFS-4418    Author: Todd Lipcon, 2013-01-17, 23:11
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