pmlogger, pmproxy: archive "push" functionality #2214
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Extension to the pmlogger utility to allow remote PCP archive creation using a push mechanism, based on HTTP and a PMWEBAPI /logger API, instead of the traditional pmcd pull mechanism. Archives can be pushed to a remote pmproxy server as they are being created by pmlogger, instead of (or as well as) written to local disk, using the -R/--remote option. A pmlogpush(1) utility is added to perform this 'remote push' functionality for existing archives. This commit includes libpcp_web improvements to its existing HTTP GET operation (incl. transition of existing PMDAs using this interface) and addition of a consistent POST operation, which is used by pmlogger and pmlogpush. Resolves performancecopilot#2059
Integrating pmlogger push mode with key server indexing. This commit fixes stat-based timestamp use in the libpcp_web discovery code, which was disconnected (now statbuf refers to the latest .meta file state as I believe originally intended). Additionally, the libpcp pmNewContext code now allows "empty" archives (just labels) as valid, in the case where we perform net-streaming or file-based archive discovery. The "last log volume" new context flag is used to identify this mode.
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Extension to the pmlogger utility to allow remote PCP archive creation using a push mechanism, based on HTTP and a PMWEBAPI /logger API, instead of the traditional pmcd pull mechanism.
Archives can be pushed to a remote pmproxy server as they are being created by pmlogger, instead of (or as well as) written to local disk, using the -R/--remote option.
A pmlogpush(1) utility is added to perform this 'remote push' functionality for existing archives.
This commit includes libpcp_web improvements to its existing HTTP GET operation (incl. transition of existing PMDAs using this interface) and addition of a consistent POST operation, which is used by pmlogger and pmlogpush.
Resolves #2059