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[HDFS-3859] QJM: implement md5sum verification - HDFS - [issue]
...When the QJM passes journal segments between nodes, it should use an md5sum field to make sure the data doesn't get corrupted during transit. This also serves as an extra safe-guard to make ...
http://issues.apache.org/jira/browse/HDFS-3859    Author: Todd Lipcon, 2012-09-17, 22:28
[HDFS-3894] QJM: testRecoverAfterDoubleFailures can be flaky due to IPC client caching - HDFS - [issue]
...TestQJMWithFaults.testRecoverAfterDoubleFailures fails really occasionally. Looking into it, the issue seems to be that it's possible by random chance for an IPC server port to be reused bet...
http://issues.apache.org/jira/browse/HDFS-3894    Author: Todd Lipcon, 2012-09-14, 00:00
[HDFS-3906] QJM: quorum timeout on failover with large log segment - HDFS - [issue]
...In doing some stress tests, I ran into an issue with failover if the current edit log segment written by the old active is large. With a 327MB log segment containing 6.4M transactions, the J...
http://issues.apache.org/jira/browse/HDFS-3906    Author: Todd Lipcon, 2012-09-11, 07:32
[HDFS-862] Potential NN deadlock in processDistributedUpgradeCommand - HDFS - [issue]
...Haven't seen this in practice, but the lock order is inconsistent. processReport locks FSNamesystem, then calls UpgradeManager.startUpgrade, getUpgradeState, and getUpgradeStatus (each of wh...
http://issues.apache.org/jira/browse/HDFS-862    Author: Todd Lipcon, 2012-09-11, 06:57
[HDFS-3915] QJM: Failover fails with auth error in secure cluster - HDFS - [issue]
...When testing failover in a secure cluster with QJM, we ran into the following error:java.io.IOException: Exception trying to open authenticated connection to http://xxxxx:8480/getJournal?jid...
http://issues.apache.org/jira/browse/HDFS-3915    Author: Todd Lipcon, 2012-09-11, 05:53
[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
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