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[HDFS-3914] QJM: acceptRecovery should abort current segment - HDFS - [issue]
...Found this bug with randomized testing. The following sequence causes a problem: JN writing segment starting at txid 1, and successfully wrote txid 1, but no more JN becomes partitioned from...
http://issues.apache.org/jira/browse/HDFS-3914    Author: Todd Lipcon, 2012-09-11, 00:21
[HDFS-3899] QJM: Writer-side metrics - HDFS - [issue]
...We already have some metrics on the server side (JournalNode) but it's useful to also gather metrics from the client side (NameNode). This is important in order to monitor that the client is...
http://issues.apache.org/jira/browse/HDFS-3899    Author: Todd Lipcon, 2012-09-10, 23:40
[HDFS-3901] QJM: send 'heartbeat' messages to JNs even when they are out-of-sync - HDFS - [issue]
...Currently, if one of the JNs has fallen out of sync with the writer (eg because it went down), it will be marked as such until the next log roll. This causes the writer to no longer send any...
http://issues.apache.org/jira/browse/HDFS-3901    Author: Todd Lipcon, 2012-09-10, 23:32
[HDFS-3900] QJM: avoid validating log segments on log rolls - HDFS - [issue]
...Currently, we are paranoid and validate every log segment when it is finalized. For the a log segment that has been written entirely by one writer, with no recovery in between, this is overl...
http://issues.apache.org/jira/browse/HDFS-3900    Author: Todd Lipcon, 2012-09-10, 19:54
[HDFS-3885] QJM: optimize log sync when JN is lagging behind - HDFS - [issue]
...This is a potential optimization that we can add to the JournalNode: when one of the nodes is lagging behind the others (eg because its local disk is slower or there was a network blip), it ...
http://issues.apache.org/jira/browse/HDFS-3885    Author: Todd Lipcon, 2012-09-10, 19:51
[HDFS-3898] QJM: enable TCP_NODELAY for IPC - HDFS - [issue]
...Currently, if the size of the edits batches is larger than the MTU, it can result in 40ms delays due to interaction between nagle's algorithm and delayed ack. Enabling TCP_NODELAY on the soc...
http://issues.apache.org/jira/browse/HDFS-3898    Author: Todd Lipcon, 2012-09-10, 19:47
[HDFS-3438] BootstrapStandby should not require a rollEdits on active node - HDFS - [issue]
...Currently, BootstrapStandby uses a rollEdits() call on the active NN in order to determine the most recent checkpoint and transaction ID. However, this means that you cannot bootstrap a stan...
http://issues.apache.org/jira/browse/HDFS-3438    Author: Todd Lipcon, 2012-09-07, 22:09
[HDFS-3548] NamenodeFsck.copyBlock fails to create a Block Reader - HDFS - [issue]
...NamenodeFsck.copyBlock creates a Socket using new Socket(), and thus that socket doesn't have an associated Channel. Then, it fails to create a BlockReader since RemoteBlockReader2 needs a s...
http://issues.apache.org/jira/browse/HDFS-3548    Author: Todd Lipcon, 2012-09-07, 22:09
[HDFS-3726] QJM: if a logger misses an RPC, don't retry that logger until next segment - HDFS - [issue]
...Currently, if a logger misses an RPC in the middle of a log segment, or misses the startLogSegment RPC (eg it was down or network was disconnected during that time period), then it will thro...
http://issues.apache.org/jira/browse/HDFS-3726    Author: Todd Lipcon, 2012-09-06, 18:00
[HDFS-3891] QJM: SBN fails if selectInputStreams throws RTE - HDFS - [issue]
...Currently, QJM's selectInputStream method throws an RTE if a quorum cannot be reached. This propagates into the Standby Node and causes the whole node to crash. It should handle this error a...
http://issues.apache.org/jira/browse/HDFS-3891    Author: Todd Lipcon, 2012-09-06, 17:32
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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