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[ACCUMULO-3330] Tserver "Running low on memory" appears more frequently than necessary when min heap != max heap - Accumulo - [issue]
...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...
http://issues.apache.org/jira/browse/ACCUMULO-3330    Author: Jonathan Park, 2014-11-13, 18:21
[ACCUMULO-2889] Batch metadata table updates for new walogs - Accumulo - [issue]
...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 ...
http://issues.apache.org/jira/browse/ACCUMULO-2889    Author: Jonathan Park, 2014-09-01, 12:30
Re: tserver.mutation.queue.max default in 1.5 - Accumulo - [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...
   Author: Jonathan Park, 2014-07-23, 22:14
[ACCUMULO-2827] HeapIterator optimization - Accumulo - [issue]
...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 ...
http://issues.apache.org/jira/browse/ACCUMULO-2827    Author: Jonathan Park, 2014-06-26, 21:29
[ACCUMULO-2671] BlockedOutputStream can hit a StackOverflowError - Accumulo - [issue]
...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...
http://issues.apache.org/jira/browse/ACCUMULO-2671    Author: Jonathan Park, 2014-04-28, 20:05
[ACCUMULO-2669] NoFlushOutputStream always in use in DfsLogger - Accumulo - [issue]
...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 ...
http://issues.apache.org/jira/browse/ACCUMULO-2669    Author: Jonathan Park, 2014-04-17, 22:22
[ACCUMULO-2668] slow WAL writes - Accumulo - [issue]
...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 ...
http://issues.apache.org/jira/browse/ACCUMULO-2668    Author: Jonathan Park, 2014-04-17, 16:01
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB