Anoop Sam John
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[HBASE-14014] Explore row-by-row grouping options
...See discussion in parent.We need to considering the following attributes of WALKey: The cluster ids Table Name write time (here we could use the latest of any batch) seqNumAs long as we pres...
, 2015-12-04, 19:38
[HBASE-14315] Save one call to KeyValueHeap.peek per row
...Another one of my micro optimizations.In StoreScanner.next(...) we can actually save a call to KeyValueHeap.peek, which in my runs of scan heavy loads shows up at top.Based on the run and da...
, 2015-12-01, 01:25
[HBASE-14791] Batch Deletes in MapReduce jobs (0.98)
...We found that some of our copy table job run for many hours, even when there isn't that much data to copy.Vikas Vishwakarma did his magic and found that the issue is with copying delete mark...
, 2015-11-19, 18:55
[HBASE-12621] Explain in the book when KEEP_DELETED_CELLS is useful
...KEEP_DELETED_CELLS seems to be very confusing.The books need further clarification when this setting is useful and what the implications are.(and maybe we should discuss if there's a simpler...
, 2015-11-13, 17:32
[HBASE-13318] RpcServer.getListenerAddress should handle when the accept channel is closed
...We just saw exceptions like these:Exception in thread "B.DefaultRpcServer.handler=45,queue=0,port=60020" java.lang.NullPointerException at org.apache.hadoop.hbase.ipc.RpcServer$Listener.getA...
, 2015-10-25, 04:34
[HBASE-14628] [0.98] Save object creation for scanning with block encodings
...I noticed that (at least in 0.98 - master is entirely different) we create ByteBuffer just to create a byte, which is then used to create a KeyValue.We can save the creation of the ByteBuf...
, 2015-10-22, 21:55
[HBASE-7755] Experiment with LAB in BlockEndcoding
...I was looking at and profiling the BlockEncoding code to figure out how to make it faster. One issue that jumped out was we call ByteBuffer.allocate(...) for each single KV.As an experiment ...
, 2015-10-11, 19:43
[HBASE-14509] Configurable sparse indexes?
...This idea just popped up today and I wanted to record it for discussion:What if we kept sparse column indexes per region or HFile or per configurable range?I.e. For any given CQ we record th...
, 2015-10-06, 16:26
[HBASE-14489] postScannerFilterRow consumes a lot of CPU
...During an unrelated test I found that when scanning a tall table with CQ only and filtering most results at the server, 50% of time is spend in postScannerFilterRow, even though the coproces...
, 2015-09-27, 04:10
[HBASE-14418] Make better SEEK vs SKIP decision with seek hints.
...Continuation of parent.We can also do this optimization for seek hints. This would allow filters and coprocessors to be more liberal with seek hints, as seeking when unnecessary is less of p...
, 2015-09-13, 00:41
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