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[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
[HDFS-3429] DataNode reads checksums even if client does not need them - HDFS - [issue]
...Currently, even if the client does not want to verify checksums, the datanode reads them anyway and sends them over the wire. This means that performance improvements like HBase's applicatio...
http://issues.apache.org/jira/browse/HDFS-3429    Author: Todd Lipcon, 2013-01-15, 13:20
[HDFS-3677] dfs.namenode.edits.dir.required missing from hdfs-default.xml - HDFS - [issue]
...This config should be documented. It's useful for cases where the user would like to ensure that (eg) an NFS filer always has the most up-to-date edits....
http://issues.apache.org/jira/browse/HDFS-3677    Author: Todd Lipcon, 2012-12-28, 03:49
[HDFS-3571] Allow EditLogFileInputStream to read from a remote URL - HDFS - [issue]
...In order to start up from remote edits storage (like the JournalNodes of HDFS-3077), the NN needs to be able to load edits from a URL, instead of just local disk. This JIRA extends EditLogFi...
http://issues.apache.org/jira/browse/HDFS-3571    Author: Todd Lipcon, 2012-12-11, 19:45
[HDFS-2525] Race between BlockPoolSliceScanner and append - HDFS - [issue]
...I wrote a test which runs append() in a loop on a single file with a single replica, appending 0~100 bytes each time. If this races with the BlockPoolSliceScanner, I observe the BlockPoolSli...
http://issues.apache.org/jira/browse/HDFS-2525    Author: Todd Lipcon, 2012-12-10, 22:28
[HDFS-3626] Creating file with invalid path can corrupt edit log - HDFS - [issue]
...Joris Bontje reports the following:The following command results in a corrupt NN editlog (note the double slash and reading from stdin):$ cat /usr/share/dict/words | hadoop fs -put - hdfs://...
http://issues.apache.org/jira/browse/HDFS-3626    Author: Todd Lipcon, 2012-12-04, 19:40
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