Affects Version/s: None
Fix Version/s: 7.4
Currently, we write buffering logs to current tlog and not apply that updates to index. Then we rely on replay log to apply that updates to index. But at the same time there are some updates also write to current tlog and applied to the index.
For example, during peersync, if new updates come to replica we will end up with this tlog
tlog : old1, new1, new2, old2, new3, old3
old updates belong to peersync, and these updates are applied to the index.
new updates belong to buffering updates, and these updates are not applied to the index.
But writing all the updates to same current tlog make code base very complex. We should write buffering updates to another tlog file.
By doing this, it will help our code base simpler. It also makes replica recovery for
SOLR-9835 more easier. Because after peersync success we can copy new updates from temporary file to current tlog, for example
tlog : old1, old2, old3
temporary tlog : new1, new2, new3
tlog : old1, old2, old3, new1, new2, new3