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Colin Patrick McCabe
Tsz Wo Nicholas Sze
Aaron T. Myers
Brahma Reddy Battula
Uma Maheswara Rao G
Rushabh S Shah
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[HDFS-9258] NN should indicate which nodes are stale
...Determining why the NN is not coming out of safemode is difficult - is it a bug or pending block reports? If the number of nodes appears sufficient, but there are missing blocks, it wo...
, 2016-02-23, 14:58
[HDFS-7457] DatanodeID generates excessive garbage
...DatanodeID#getXferAddr is a dynamically generated string. This string is repeatedly generated for the hash code, equality, comparisons, and stringification. Every DN->NN RPC m...
, 2016-02-11, 23:20
[HDFS-8486] DN startup may cause severe data loss
...A race condition between block pool initialization and the directory scanner may cause a mass deletion of blocks in multiple storages.If block pool initialization finds a block on disk that ...
, 2016-02-11, 23:17
[HDFS-4478] Token operations should not lock namespace
...Token get/renew/cancel operations obtain a write lock on the namespace. This seems unnecessary....
, 2016-01-22, 03:30
[HDFS-6221] Webhdfs should recover from dead DNs
...We've repeatedly observed the jetty acceptor thread silently dying in the DNs. The webhdfs servlet may also "disappear" and jetty returns non-json 404s.One approach to make webhdfs mor...
, 2016-01-13, 19:17
[HDFS-9557] Reduce object allocation in PB conversion
...PB conversions use ByteString.copyFrom to populate the builder. Unfortunately this creates unique instances for empty arrays instead of returning the singleton ByteString.EMPTY....
, 2015-12-21, 18:55
[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...
, 2015-11-11, 21:21
[HDFS-9287] Block placement completely fails if too many nodes are decommissioning
...The DatanodeManager coordinates with the HeartbeatManager to update HeartbeatManager.Stats to track capacity and load. This is crucial for block placement to consider space and load. ...
, 2015-10-22, 18:23
[HDFS-8492] DN should notify NN when client requests a missing block
...If the DN has a block its volume map but not on-disk, it tells clients it's an invalid block id. The NN is not informed of the missing block until either the bp slice scanner or the di...
, 2015-10-12, 10:57
[HDFS-9107] Prevent NN's unrecoverable death spiral after full GC
...A full GC pause in the NN that exceeds the dead node interval can lead to an infinite cycle of full GCs. The most common situation that precipitates an unrecoverable state is a network...
, 2015-09-26, 04:43
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