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[HDFS-3656] ZKFC may write a null "breadcrumb" znode - HDFS - [issue]
...A user reported an NPE trying to read the "breadcrumb" znode in the failover controller. This happened repeatedly, implying that an earlier process set the znode to null - probably some race...
http://issues.apache.org/jira/browse/HDFS-3656    Author: Todd Lipcon, 2013-08-14, 22:24
[HDFS-3020] Auto-logSync based on edit log buffer size broken - HDFS - [issue]
...HDFS-1112 added a feature whereby the edit log automatically calls logSync() if the buffered data crosses a threshold. However, the code checks bufReady.size() rather than bufCurrent.size() ...
http://issues.apache.org/jira/browse/HDFS-3020    Author: Todd Lipcon, 2013-08-10, 12:33
[HDFS-3053] Support for true zero-copy (mmap-based) reads - HDFS - [issue]
...Continuing a discussion started in HDFS-2834, it would be slick to provide support for a true zero-copy read API. In this style API, rather than having the user pass buffers to read into, th...
http://issues.apache.org/jira/browse/HDFS-3053    Author: Todd Lipcon, 2013-07-29, 03:03
[HDFS-4915] Add config to ZKFC to disable fencing - HDFS - [issue]
...With QuorumJournalManager, it's not important for the ZKFCs to perform any fencing. We currently workaround this by setting the fencer to /bin/true, but the ZKFC still does things like creat...
http://issues.apache.org/jira/browse/HDFS-4915    Author: Todd Lipcon, 2013-07-01, 13:45
[HDFS-1172] Blocks in newly completed files are considered under-replicated too quickly - HDFS - [issue]
...I've seen this for a long time, and imagine it's a known issue, but couldn't find an existing JIRA. It often happens that we see the NN schedule replication on the last block of files very q...
http://issues.apache.org/jira/browse/HDFS-1172    Author: Todd Lipcon, 2013-06-25, 10:24
[HDFS-3792] Fix two findbugs introduced by HDFS-3695 - HDFS - [issue]
...Accidentally introduced two trivial findbugs warnings in HDFS-3695. This JIRA is to fix them....
http://issues.apache.org/jira/browse/HDFS-3792    Author: Todd Lipcon, 2013-06-13, 23:53
[HDFS-3447] StandbyException should not be logged at ERROR level on server - HDFS - [issue]
...Currently, the standby NN will log StandbyExceptions at ERROR level any time a client tries to connect to it. So, if the second NN in an HA pair is active, the first NN will spew a lot of th...
http://issues.apache.org/jira/browse/HDFS-3447    Author: Todd Lipcon, 2013-06-07, 08:31
[HDFS-3974] dfsadmin -metasave throws NPE when under-replicated blocks are recently deleted - HDFS - [issue]
...We currently have the following race: Block is underreplicated, hence it's present in neededReplications User deletes the block - its BlockInfo.blockCollection is set to null Admin runs meta...
http://issues.apache.org/jira/browse/HDFS-3974    Author: Todd Lipcon, 2013-06-04, 19:23
[HDFS-4298] StorageRetentionManager spews warnings when used with QJM - HDFS - [issue]
...When the NN is configured with a QJM, we see the following warning message every time a checkpoint is made or uploaded:12/12/10 16:07:52 WARN namenode.FSEditLog: Unable to determine input st...
http://issues.apache.org/jira/browse/HDFS-4298    Author: Todd Lipcon, 2013-05-25, 16:11
[HDFS-4833] Corrupt blocks are not invalidated when first processing repl queues - HDFS - [issue]
...When the NN processes misreplicated blocks in processMisReplicatedBlock (eg during initial startup when first processing repl queues), it does not invalidate corrupt replicas unless the bloc...
http://issues.apache.org/jira/browse/HDFS-4833    Author: Todd Lipcon, 2013-05-16, 22:05
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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