Enis Soztutar created HBASE-15177:
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Summary: Reduce garbage created under high load
Key: HBASE-15177
URL: https://issues.apache.org/jira/browse/HBASE-15177
Project: HBase
Issue Type: Improvement
Reporter: Enis Soztutar
Assignee: Enis Soztutar
Fix For: 2.0.0, 1.3.0
I have been doing some profiling of the garbage being created. The idea was to
follow up on HBASE-14490 and experiment with offheap IPC byte buffers and byte
buffer re-use. However, without changing the IPC byte buffers for now, there
are a couple of (easy) improvements that I've identified from profiling:
1. RPCServer.Connection.processRequest() should work with ByteBuffer instead of
byte[] and not-recreate CodedInputStream a few times.
2. RSRpcServices.getRegion() allocates two byte arrays for region, while only 1
is needed.
3. AnnotationReadingPriorityFunction is very expensive in allocations. Mainly
it allocates the regionName byte[] to get the table name. We already set the
priority for most of the operations (multi, get, increment, etc) but we are
only reading the priority in case of multi. We should use the priority from the
client side.
Lets do the simple improvements in this patch, we can get to IPC buffer re-use
in HBASE-14490.
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