Steve Loughran created HADOOP-15489:
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Summary: S3Guard to self update on directory listings of S3
Key: HADOOP-15489
URL: https://issues.apache.org/jira/browse/HADOOP-15489
Project: Hadoop Common
Issue Type: Sub-task
Components: fs/s3
Affects Versions: 3.1.0
Environment: s3guard
Reporter: Steve Loughran
S3Guard updates its table on a getFileStatus call, but not on a directory
listing.
While this makes directory listings faster (no need to push out an update), it
slows down subsequent queries of the files, such as a sequence of:
{code}
statuses = s3a.listFiles(dir)
for (status: statuses) {
if (status.isFile) {
try(is = s3a.open(status.getPath())) {
... do something
}
}
{code}
this is because the open() is doing the getFileStatus check, even after the
listing.
Updating the DDB tables after a listing would give those reads a speedup,
albeit at the expense of initiating a (bulk) update in the list call. Of
course, we could consider making that async, though that design (essentially a
write-buffer) would require the buffer to be checked in the reads too.
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