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[HDFS-7501] TransactionsSinceLastCheckpoint can be negative on SBNs - HDFS - [issue]
...The metric TransactionsSinceLastCheckpoint is derived as FSEditLog.txid minus NNStorage.mostRecentCheckpointTxId.In Standby mode, the former does not increment beyond the loaded or last-when...
http://issues.apache.org/jira/browse/HDFS-7501    Author: Harsh J, 2015-01-14, 18:16
[HDFS-7580] NN -> JN communication should use reusable authentication methods - HDFS - [issue]
...It appears that NNs talk to JNs via general SaslRPC in secure mode, causing all requests to be carried out with a kerberos authentication. This can cause delays and occasionally NN failures ...
http://issues.apache.org/jira/browse/HDFS-7580    Author: Harsh J, 2015-01-05, 06:49
[HDFS-7546] Document, and set an accepting default for dfs.namenode.kerberos.principal.pattern - HDFS - [issue]
...This config is used in the SaslRpcClient, and the no-default breaks cross-realm trust principals being used at clients.Current location: https://github.com/apache/hadoop/blob/trunk/hadoop-co...
http://issues.apache.org/jira/browse/HDFS-7546    Author: Harsh J, 2014-12-18, 15:23
[HDFS-4257] The ReplaceDatanodeOnFailure policies could have a forgiving option - HDFS - [issue]
...Similar question has previously come over HDFS-3091 and friends, but the essential problem is: "Why can't I write to my cluster of 3 nodes, when I just have 1 node available at a point in ti...
http://issues.apache.org/jira/browse/HDFS-4257    Author: Harsh J, 2014-12-01, 03:11
[HDFS-2936] File close()-ing hangs indefinitely if the number of live blocks does not match the minimum replication - HDFS - [issue]
...If an admin wishes to enforce replication today for all the users of their cluster, he may set dfs.namenode.replication.min. This property prevents users from creating files with < expect...
http://issues.apache.org/jira/browse/HDFS-2936    Author: Harsh J, 2014-11-12, 21:45
[HDFS-7290] Add HTTP response code to the HttpPutFailedException message - HDFS - [issue]
...If the TransferFsImage#uploadImageFromStorage(…) call fails for some reason, we try to print back the reason of the connection failure.We currently only grab connection.getResponseMessage(…)...
http://issues.apache.org/jira/browse/HDFS-7290    Author: Harsh J, 2014-10-27, 15:52
[HDFS-5189] Rename the "CorruptBlocks" metric to "CorruptReplicas" - HDFS - [issue]
...The NameNode increments a "CorruptBlocks" metric even if only one of the block'sreplicas is reported corrupt (genuine checksum fail, or even if areplica has a bad genstamp). In cases where t...
http://issues.apache.org/jira/browse/HDFS-5189    Author: Harsh J, 2014-08-14, 19:35
[HDFS-4449] When a decommission is awaiting closure of live blocks, show the block IDs on the NameNode's UI report - HDFS - [issue]
...It is rather common for people to be complaining about 'DN decommission' hangs cause of live blocks waiting to get completed by some app (especially certain HBase specifics cause a file to b...
http://issues.apache.org/jira/browse/HDFS-4449    Author: Harsh J, 2014-07-25, 20:07
[HDFS-2571] Error encountered while attempting a dfsadmin -report - HDFS - [issue]
...Saw this while trying some things on HDFS-2569➜  hadoop-0.23.0  bin/hdfs dfsadmin -reportlog4j:ERROR Could not find value for key log4j.appender.NullAppenderlog4j:ERROR Could not i...
http://issues.apache.org/jira/browse/HDFS-2571    Author: Harsh J, 2014-04-03, 03:28
[HDFS-3590] Print a WARN if the edit log sync period takes more than X time units - HDFS - [issue]
...If an logSync operation, which happens for calls such as FS#create() after the edit has been made at the NN metadata, takes longer than X seconds (I'd say if it took more than a minute, ther...
http://issues.apache.org/jira/browse/HDFS-3590    Author: Harsh J, 2014-03-17, 17:18
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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