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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-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
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB