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https://issues.apache.org/jira/browse/HBASE-8497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650056#comment-13650056
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Sergey Shelukhin commented on HBASE-8497:
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We need to be very careful with this, because WAL is not guaranteed to be
finished.
There needs to be some magic at the end of the file, to indicate that WAL is
finished, then trailer size; and around that there needs to be sanity checks in
case if magic appears by coincidence.
And nothing should depend on the trailer necessarily being there, WAL should be
replayable without it.
Also it needs to be done fast, before PB WAL ships, or one would also have to
care about backward compat :)
> Protobuf WAL also needs a trailer
> ----------------------------------
>
> Key: HBASE-8497
> URL: https://issues.apache.org/jira/browse/HBASE-8497
> Project: HBase
> Issue Type: Sub-task
> Components: Protobufs, wal
> Affects Versions: 0.95.1
> Reporter: Enis Soztutar
> Fix For: 0.98.0, 0.95.1
>
>
> New Protobuf WAL has a header, but we will probably need a trailer as well,
> reserved for later usage.
> Right now, we can we just serialize an empty trailer, but putting more
> metadata there, like range of sequence_id's, region names, table names etc
> might be needed in the future.
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