Billie J Rinaldi
Dickson, Matt MR
Alan D. Cabrera
John W Vines
Ott, Charles H.
Cardon, Tejay E
Corey J. Nolet
Slater, David M.
mail # dev
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[ACCUMULO-2889] Batch metadata table updates for new walogs
...Currently, when we update the Metadata table with new loggers, we will update the metadata for each tablet serially. We could optimize this to instead use a batchwriter to send all metadata ...
, 2015-07-09, 23:50
[ACCUMULO-3330] Tserver "Running low on memory" appears more frequently than necessary when min heap != max heap
...I'm not sure if this is JVM specific behavior, but I suspect the way we compute when to log "Running low on memory" could be improved. Currently we use Runtime.getRuntime() and rely on the f...
, 2015-05-27, 20:38
tserver.mutation.queue.max default in 1.5
- [mail # dev]
...+1 as well.In our 1.5.x deployments, we typically increase the tserver.mutation.queue.max value after an installation to achieve acceptable ingest performance. Increasing to 1M to be consist...
, 2014-07-23, 22:14
[ACCUMULO-2827] HeapIterator optimization
...We've been running a few performance tests of our iterator stack and noticed a decent amount of time spent in the HeapIterator specifically related to add/removal into the heap.This may not ...
, 2014-06-26, 21:29
[ACCUMULO-2671] BlockedOutputStream can hit a StackOverflowError
...This issue mostly came up after a resolution to ACCUMULO-2668 that allows a byte to be passed directly to the underlying stream from the NoFlushOutputStream.The problem appears to be due t...
, 2014-04-28, 20:05
[ACCUMULO-2669] NoFlushOutputStream always in use in DfsLogger
...I may be misreading the implementation of DfsLogger, but it looks like we always make use of the NoFlushOutputStream, even if encryption isn't enabled. There appears to be a faulty check in ...
, 2014-04-17, 22:22
[ACCUMULO-2668] slow WAL writes
...During continuous ingest, we saw over 70% of our ingest time taken up by writes to the WAL. When we ran the DfsLogger in isolation (created one outside of the Tserver), we saw about ~25MB/s ...
, 2014-04-17, 16:01
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