[jboss-jira] [JBoss JIRA] Commented: (JGRP-1331) Digest: remove low seqno

[ https://issues.jboss.org/browse/JGRP-1331?page=com.atlassian.jira.plugin.... ] Bela Ban commented on JGRP-1331: -------------------------------- For marshalling purposes, we could add a flag 'options' to the serialized bytes (Digest.writeTo(),readFrom()): - NORMAL: 3 longs follow - ZERO: nothing follows (all 3 longs are 0) - COMPRESSED_SHORT_INT: 1 long, 1 short, 1 int. The first value is uncompressed, the second is a short diff to the second, the 3rd is an int diff to the first. - COMPRESSED_SHORT_SHORT: (similar to above) - COMPRESSED_INT_SHORT: - COMPRESSED_INT_INT: If we have 100000 (low), 120000 (highest_delivered) and 125000 (highest_received), we'd send the digest as: | COMPRESSED_SHORT_SHORT | 100000 (long) | 20000 (short) | 5000 (short) | As an additional optimization, we could use the special marker -1 to mean that the value is the same as the previous value, e.g. for (100000,120000,120000): | 100000 | 20000 (short) | -1 (short) | These optimizations are possible because we know that the highest_received and highest_delivered seqnos are usually very close to each other (unless there are gaps and retransmission). The low seqno is a bit further apart, depending on settings of STABLE. If we can get rid of low, then we could even further optimize the serialization of highest_received and highest_delivered seqnos ! -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira