Sijie Guo created BOOKKEEPER-565:
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Summary: Make an option to separate storing entry log files from
index files.
Key: BOOKKEEPER-565
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-565
Project: Bookkeeper
Issue Type: Improvement
Reporter: Sijie Guo
Assignee: Sijie Guo
Currently, the add operation will go throughput ledger storage first and
journal later. the latency of an add operation would be affected by two parts,
one is ledger disk and the other one is journal disk. And flushing ledger index
files might cause random i/o, which would affect adding entries to ledger
storage in a higher workload.
there are several ideas to resolve this problem, one is aggregate the per-file
index into several files to make flushing more sequential.
this jira is a simple solution to separate the disks to avoid disk contention.
it is a straightforward way w/ less risk, but not a perfect way which might
waste an extra disk and bandwidth.
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