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[HDFS-12070] Failed block recovery leaves files open indefinitely and at risk for data loss
...Files will remain open indefinitely if block recovery fails which creates a high risk of data loss. The replication monitor will not replicate these blocks.The NN provides the primary ...
, 2018-02-23, 01:42
[HDFS-13112] Token expiration edits may cause log corruption or deadlock
...HDFS-4477 specifically did not acquire the fsn lock during token cancellation based on the belief that edit logs are thread-safe. However, log rolling is not thread-safe. Failure...
, 2018-02-15, 23:18
[HDFS-11310] Reduce the performance impact of the balancer (trunk port)
...HDFS-7967 introduced a highly performant balancer getBlocks() query that scales to large/dense clusters. The simple design implementation depends on the triplets data structure. ...
, 2018-02-14, 03:49
[HDFS-12049] Recommissioning live nodes stalls the NN
...A node refresh will recommission included nodes that are alive and in decommissioning or decommissioned state. The recommission will scan all blocks on the node, find over replicated b...
, 2018-02-14, 03:49
[HDFS-13111] Close recovery may incorrectly mark blocks corrupt
...Close recovery can leave a block marked corrupt until the next FBR arrives from one of the DNs. The reason is unclear but has happened multiple times when a DN has io saturated disks....
, 2018-02-13, 17:07
[HDFS-6763] Initialize file system-wide quota once on transitioning to active
...FSImage#loadEdits calls updateCountForQuota to recalculate & verify quotas for the entire namespace. A standby NN using shared edits calls this method every minute. The stand...
, 2018-02-08, 21:57
[HDFS-12136] BlockSender performance regression due to volume scanner edge case
...HDFS-11160 attempted to fix a volume scan race for a file appended mid-scan by reading the last checksum of finalized blocks within the BlockSender ctor. Unfortunately it's holding the...
, 2018-02-07, 05:10
[HDFS-10673] Optimize FSPermissionChecker's internal path usage
...The INodeAttributeProvider and AccessControlEnforcer features degrade performance and generate excessive garbage even when neither is used. Main issues: A byte of components is unn...
, 2018-01-05, 18:27
[HDFS-8675] IBRs from dead DNs go into infinite loop
...If the DN sends an IBR after the NN declares it dead, the NN returns an IOE of unregistered or dead. The DN catches the IOE, ignores it, and infinitely loops spamming the NN with retri...
, 2017-12-15, 20:27
[HDFS-12907] Allow read-only access to reserved raw for non-superusers
...HDFS-6509 added a special /.reserved/raw path prefix to access the raw file contents of EZ files. In the simplest sense it doesn't return the FE info in the LocatedBlocks so the dfs cl...
, 2017-12-14, 21:19
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