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[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
[HDFS-3867] QJM: Support rolling restart of JNs - HDFS - [issue]
...In order to perform upgrades or other maintenance, it is useful to be able to perform a rolling restart of the journal nodes while the NameNode is active.Currently, this does not work, becau...
http://issues.apache.org/jira/browse/HDFS-3867    Author: Todd Lipcon, 2012-09-06, 01:19
[HDFS-3876] NN should not RPC to self to find trash defaults (causes deadlock) - HDFS - [issue]
...When transitioning a SBN to active, I ran into the following situation: the TrashPolicy first gets loaded by an IPC Server Handler thread. The initialize function then tries to make an RPC t...
http://issues.apache.org/jira/browse/HDFS-3876    Author: Todd Lipcon, 2012-09-05, 19:31
[HDFS-3870] QJM: add metrics to JournalNode - HDFS - [issue]
...The JournalNode should expose some basic metrics through the usual interface. In particular: the writer epoch, accepted epoch, the last written transaction ID and last committed txid (which ...
http://issues.apache.org/jira/browse/HDFS-3870    Author: Todd Lipcon, 2012-09-05, 05:31
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