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[HDFS-3901] QJM: send 'heartbeat' messages to JNs even when they are out-of-sync - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3901
Author: Todd Lipcon,
2012-09-10, 23:32
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[HDFS-3900] QJM: avoid validating log segments on log rolls - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3900
Author: Todd Lipcon,
2012-09-10, 19:54
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[HDFS-3885] QJM: optimize log sync when JN is lagging behind - HDFS - [issue]
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...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 ...
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http://issues.apache.org/jira/browse/HDFS-3885
Author: Todd Lipcon,
2012-09-10, 19:51
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[HDFS-3898] QJM: enable TCP_NODELAY for IPC - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3898
Author: Todd Lipcon,
2012-09-10, 19:47
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[HDFS-3438] BootstrapStandby should not require a rollEdits on active node - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3438
Author: Todd Lipcon,
2012-09-07, 22:09
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[HDFS-3548] NamenodeFsck.copyBlock fails to create a Block Reader - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3548
Author: Todd Lipcon,
2012-09-07, 22:09
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[HDFS-3726] QJM: if a logger misses an RPC, don't retry that logger until next segment - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3726
Author: Todd Lipcon,
2012-09-06, 18:00
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[HDFS-3891] QJM: SBN fails if selectInputStreams throws RTE - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3891
Author: Todd Lipcon,
2012-09-06, 17:32
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[HDFS-3867] QJM: Support rolling restart of JNs - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3867
Author: Todd Lipcon,
2012-09-06, 01:19
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[HDFS-3876] NN should not RPC to self to find trash defaults (causes deadlock) - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3876
Author: Todd Lipcon,
2012-09-05, 19:31
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