Possible performance improvement in Bytes.java
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Key: HBASE-4157
URL: https://issues.apache.org/jira/browse/HBASE-4157
Project: HBase
Issue Type: Improvement
Components: performance
Affects Versions: 0.90.4
Environment: all
Reporter: nkeywal
Priority: Minor
This is in line with the work already done on HBASE-4012.
It's possible to improve all functions like Bytes.toShort, Bytes.toInt... and
Bytes.putShort, putInt... by calling sun.misc.Unsafe functions. However, when
using these functions the endianess must be taken into account. Infortunatly,
HBase uses big endian while x86 systems are little endian. Hence a conversion
is required. This convertion (Integer.reverseBytes) is optimized on jdk1.7 and
1.6.u23 version (see jdk 6946040 & 2198024). So with 1.6.u23+, this improvement
could bring something around 5-10% on the whole system. Moreover, as for
HBASE-4012, a compatibility feature for non little endian cpus or jdk without
sun.misc.unsafe will have to be kept.
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