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[HBASE-6981] multiple commit logs per region server - HBase - [issue]
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...For write dominated workloads, the fact that we have only 1 commit log per server artificially limits the aggregate throughput to that of one disk (this is especially true if we do tru...
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http://issues.apache.org/jira/browse/HBASE-6981
Author: Kannan Muthukkaruppan,
2012-11-07, 17:51
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[HBASE-2861] regionserver's logsyncer thread hangs on DFSClient$DFSOutputStream.waitForAckedSeqno - HBase - [issue]
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...During loads into HBase, we are noticing that a RS is sometimes getting stuck.The logSyncer thread:at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.waitForAckedSeqno(DFSClient.java:3367)&...
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http://issues.apache.org/jira/browse/HBASE-2861
Author: Kannan Muthukkaruppan,
2012-11-03, 00:16
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[HBASE-6728] [89-fb] prevent OOM possibility due to per connection responseQueue being unbounded - HBase - [issue]
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...The per connection responseQueue is an unbounded queue. The request handler threads today try to send the response in line, but if things start to backup, the response is sent via a per conn...
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http://issues.apache.org/jira/browse/HBASE-6728
Author: Kannan Muthukkaruppan,
2012-10-24, 19:06
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[HBASE-6727] [89-fb] allow HBaseServers's callqueue to be better configurable to avoid OOMs - HBase - [issue]
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...The callQueue size (where requests get queued up if all handlers are busy) is a LinkedBlockingQueue of size 100 * number_of_handlers. So, with say 300 handler threads, the call queue can hav...
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http://issues.apache.org/jira/browse/HBASE-6727
Author: Kannan Muthukkaruppan,
2012-10-21, 01:01
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[HBASE-5104] Provide a reliable intra-row pagination mechanism - HBase - [issue]
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...Addendum:Doing pagination (retrieving at most "limit" number of KVs at a particular "offset") is currently supported via the ColumnPaginationFilter. However, it is not a very clean way of su...
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http://issues.apache.org/jira/browse/HBASE-5104
Author: Kannan Muthukkaruppan,
2012-10-04, 22:52
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[HBASE-6216] per-request tagging - HBase - [issue]
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...Allow applications to tag individual RPC requests so that metrics exposed by HBase can automatically be collected/aggregated by those tags. This'll be useful for problem diagnosis across var...
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http://issues.apache.org/jira/browse/HBASE-6216
Author: Kannan Muthukkaruppan,
2012-08-29, 06:03
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[HBASE-6215] per-request profiling - HBase - [issue]
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...Add ability to get HBase metrics back from an individual request. Apps can use this to track fine-grained metrics (such as server-side latency, block cache access/hit count; sync latency; ap...
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http://issues.apache.org/jira/browse/HBASE-6215
Author: Kannan Muthukkaruppan,
2012-06-15, 22:28
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[HBASE-5962] interop issue: RowMutations should be added at the end in HbaseObjectWriteable class - HBase - [issue]
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...In HbaseObjectWriteable.java new classes should be added to the end; else, old clients will not be able to talk to new HBase servers. This is causing issues in test cluster with the followin...
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http://issues.apache.org/jira/browse/HBASE-5962
Author: Kannan Muthukkaruppan,
2012-05-16, 20:04
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[HBASE-4823] long running scans lose benefit of bloomfilters and timerange hints - HBase - [issue]
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...When you have a long running scan due to say an MR job, you can lose the benefit of timerange hints & bloom filters midway if your scanner gets reset. [Note: The scanners can get res...
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http://issues.apache.org/jira/browse/HBASE-4823
Author: Kannan Muthukkaruppan,
2012-05-16, 19:55
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[HBASE-5907] enhance HLog pretty printer to print additional useful stats - HBase - [issue]
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...It would be useful for analysis purposes to enhance the HLog pretty printer to optionally print a bunch of additional stats such as:1) # of txns2) # of KVs updated3) avg size of txns4) avg s...
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http://issues.apache.org/jira/browse/HBASE-5907
Author: Kannan Muthukkaruppan,
2012-05-05, 05:01
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