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  1. Data Management
  2. DM-1900

Worker management service - design

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    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: Qserv
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      Description

      We need to replace direct worker-mysql communication and other administrative channels with a special service which will control all worker communication. Some light-weight service running alongside other worker servers, probably HTTP-based. Data loading, start/stop should be handled by this service.

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            salnikov Andy Salnikov created issue -
            salnikov Andy Salnikov made changes -
            Field Original Value New Value
            Epic Link DM-1703 [ 15464 ]
            salnikov Andy Salnikov made changes -
            Link This issue blocks DM-1901 [ DM-1901 ]
            jbecla Jacek Becla made changes -
            Description WE need to replace direct worker-mysql communication and other administrative channels with a special service which will control all worker communication. Some light-weight service running alongside other worker servers, probably HTTP-based. Data loading, start/stop should be handled by this service. We need to replace direct worker-mysql communication and other administrative channels with a special service which will control all worker communication. Some light-weight service running alongside other worker servers, probably HTTP-based. Data loading, start/stop should be handled by this service.
            jbecla Jacek Becla made changes -
            Story Points 20
            jbecla Jacek Becla made changes -
            Rank Ranked higher
            jbecla Jacek Becla made changes -
            Sprint DB_W15_04 [ 137 ]
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            Rank Ranked lower
            jbecla Jacek Becla made changes -
            Sprint DB_W15_04 [ 137 ] DB_W15_03 [ 136 ]
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            Rank Ranked lower
            jbecla Jacek Becla made changes -
            Assignee Andy Salnikov [ salnikov ]
            jbecla Jacek Becla made changes -
            Story Points 20 5
            jbecla Jacek Becla made changes -
            Link This issue is cloned by DM-2176 [ DM-2176 ]
            jbecla Jacek Becla made changes -
            Link This issue blocks DM-2176 [ DM-2176 ]
            jbecla Jacek Becla made changes -
            Link This issue is cloned by DM-2176 [ DM-2176 ]
            jbecla Jacek Becla made changes -
            Summary Worker management service Worker management service - design
            salnikov Andy Salnikov made changes -
            Status To Do [ 10001 ] In Progress [ 3 ]
            salnikov Andy Salnikov made changes -
            Watchers Andy Salnikov [ Andy Salnikov ] Andy Salnikov, Kian-Tat Lim [ Andy Salnikov, Kian-Tat Lim ]
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            salnikov Andy Salnikov added a comment -

            Some high level-ideas that have been already discussed in various tickets:

            • we need to support several management tasks on worker side:
              • data loading and replication
              • notify xrootd about some events (I think now xrootd needs restart when some things are updated)
              • start/stop individual services (mysql or xrootd)
            • we want to avoid direct access to mysql (for security and stability reasons)
            • there should be just one end point for all above activities

            This calls for an additional service which runs alongside mysql/xrood on worker host and manages them (we also discussed doing this via special xrootd plugin, but I think we rejected this idea). HTTP/RESTful interface is probably simplest thing to do as we already have necessary tools installed and some experience with building web interfaces. It would need just a single end-point for communication, either remote TCP access with adequate security or ssh tunnel should be supported.

            Furter comments will cover more specifics about API design.

            Show
            salnikov Andy Salnikov added a comment - Some high level-ideas that have been already discussed in various tickets: we need to support several management tasks on worker side: data loading and replication notify xrootd about some events (I think now xrootd needs restart when some things are updated) start/stop individual services (mysql or xrootd) we want to avoid direct access to mysql (for security and stability reasons) there should be just one end point for all above activities This calls for an additional service which runs alongside mysql/xrood on worker host and manages them (we also discussed doing this via special xrootd plugin, but I think we rejected this idea). HTTP/RESTful interface is probably simplest thing to do as we already have necessary tools installed and some experience with building web interfaces. It would need just a single end-point for communication, either remote TCP access with adequate security or ssh tunnel should be supported. Furter comments will cover more specifics about API design.
            Hide
            salnikov Andy Salnikov added a comment - - edited

            Here is the list of operations that we need or may need to support, this is primarily built from my current experience with integration tests and data loader, we may need to extend it in the future as need arises:

            Databases:

            • create/drop database (grant permissions to on database to known user account(s))
              • this implies that mysql account used by this service itself has sufficient permissions for these operations
            • create tables
              • create chunk/overlap tables from existing table definition
            • drop tables
              • may need support for dropping all chunk/overlap tables for partitioned table
            • list existing databases
              • there could be two sets of databases - one defined in mysql and one that xrootd knows about (latter should be a subset of former if things are consistent)
            • list existing tables (we probably want to hide chunk tables at this level or make it optional)
            • list existing chunks for given table name (not sure if this is required, but may be useful if only for cross-check with CSS)
              • one could check for chunks in mysql but also ask xrootd for chunks that it knows about
            • load data into a table (or chunk/overlap tables)
            • support some kinds of queries
              • e.g. we need to build secondary index, now it is implemented by querying every worker for (objectId, chunkId, subChunkId) from director table
              • we should probably avoid running arbitrary queries

            xrootd:

            • things already mentioned above about database/table/chunks known to xrootd
              • there should probably be common interface for mysql & xrootd to query that info
            • not sure what other useful info we could get from xrootd that is not available through other channels (xrootd itself or czar query information)

            Service management:

            • start/stop/restart xrootd and/or mysql
              • assumption here is that we always run all services from the same release (run directory) so there no need to pass information about how or where from these other services should run
            • query status of every component, maybe some extra information (PID, start time, memory use, etc.)
            • if this service has some dynamic parameters (e.g. logging level) it should be possible to change them through the same API
            • possibly getting access to the logs from worker?
              • but maybe for logging we should rely on logging service itself to forward all interesting stuff to central location
            Show
            salnikov Andy Salnikov added a comment - - edited Here is the list of operations that we need or may need to support, this is primarily built from my current experience with integration tests and data loader, we may need to extend it in the future as need arises: Databases: create/drop database (grant permissions to on database to known user account(s)) this implies that mysql account used by this service itself has sufficient permissions for these operations create tables create chunk/overlap tables from existing table definition drop tables may need support for dropping all chunk/overlap tables for partitioned table list existing databases there could be two sets of databases - one defined in mysql and one that xrootd knows about (latter should be a subset of former if things are consistent) list existing tables (we probably want to hide chunk tables at this level or make it optional) list existing chunks for given table name (not sure if this is required, but may be useful if only for cross-check with CSS) one could check for chunks in mysql but also ask xrootd for chunks that it knows about load data into a table (or chunk/overlap tables) support some kinds of queries e.g. we need to build secondary index, now it is implemented by querying every worker for (objectId, chunkId, subChunkId) from director table we should probably avoid running arbitrary queries xrootd: things already mentioned above about database/table/chunks known to xrootd there should probably be common interface for mysql & xrootd to query that info not sure what other useful info we could get from xrootd that is not available through other channels (xrootd itself or czar query information) Service management: start/stop/restart xrootd and/or mysql assumption here is that we always run all services from the same release (run directory) so there no need to pass information about how or where from these other services should run query status of every component, maybe some extra information (PID, start time, memory use, etc.) if this service has some dynamic parameters (e.g. logging level) it should be possible to change them through the same API possibly getting access to the logs from worker? but maybe for logging we should rely on logging service itself to forward all interesting stuff to central location
            Hide
            salnikov Andy Salnikov added a comment -

            Security

            We certainly need some reasonable protection for this service to avoid potentially harmful operations exposed to everybody. I could think of two different (or complementary) approaches, sort of what we are already doing with mysql:

            • do not expose this service on external TCP interface, instead use loopback interface and use ssh for authentication and tunneling of the connection to remote clients. Anyone who can logon to worker host via ssh can talk to the service too, so we need reasonable restrictions at ssh level. ssh encrypts all traffic, may be an overkill for us.
              • alternatively use unix socket instead of TCP port, it would allow additional protection based on groups/ACLs. ssh currently does not support tunneling to unix sockets but there could be other ways to achieve the same (netcat, patched sshd).
            • expose service end point on host's external TCP interface but protect it with some form of access control. Security based on shared secret (pasword) is probably easiest to implement and may be adequate for our cause. Encryption is not necessary for data exchange, but is expected during authentication phase if we are going to send plain text secrets around.
            Show
            salnikov Andy Salnikov added a comment - Security We certainly need some reasonable protection for this service to avoid potentially harmful operations exposed to everybody. I could think of two different (or complementary) approaches, sort of what we are already doing with mysql: do not expose this service on external TCP interface, instead use loopback interface and use ssh for authentication and tunneling of the connection to remote clients. Anyone who can logon to worker host via ssh can talk to the service too, so we need reasonable restrictions at ssh level. ssh encrypts all traffic, may be an overkill for us. alternatively use unix socket instead of TCP port, it would allow additional protection based on groups/ACLs. ssh currently does not support tunneling to unix sockets but there could be other ways to achieve the same (netcat, patched sshd). expose service end point on host's external TCP interface but protect it with some form of access control. Security based on shared secret (pasword) is probably easiest to implement and may be adequate for our cause. Encryption is not necessary for data exchange, but is expected during authentication phase if we are going to send plain text secrets around.
            Hide
            salnikov Andy Salnikov added a comment - - edited

            Here is a set of resources and operations on them for HTTP-based service implementation. This is meant to be compliant with RESTful principles. There will be corresponding JSON schema defined for each resulting data object.

            Database API

            /dbs, method=GET

            List existing databases. Returns a list of database (representations), each item in the list will contain database name and URI for its corresponding resource.

            /dbs, method=POST

            Parameters: database name

            Creates new database, fails if database already exists. On success returns database description, same object structure as returned from GET.

            /dbs/<db>, method=DELETE

            Drops database. Fails if database is not there. On success returns either "OK" response or database description.

            /dbs/<db>/tables, method=GET

            List existing tables. Returns list of table representations.

            /dbs/<db>/tables, method=POST

            Parameters: table name, table schema (or should table schema come from CSS?)

            Create new table, fail if table already exists. Returns table representation.

            /dbs/<db>/tables/<table>, method=DELETE

            Drops table. Fails if database is not there. On success returns either "OK" response or database description.

            /dbs/<db>/tables/<table>/chunks, method=GET

            List chunks in a table. Returns list of chunk representations. For non-chunked tables returns error code (this may need access to CSS, so we may decide to just return empty list).

            /dbs/<db>/tables/<table>/chunks, method=POST

            Parameters: chunk id

            Create new chunk (without data). Will make empty chunk/overlap tables based on table schema definition.

            /dbs/<db>/tables/<table>/data, method=PUT

            Parameters: table data

            Load data into a table

            /dbs/<db>/tables/<table>/chunks/<chunk>/data, method=PUT

            Parameters: table data

            Load data into a chunk table

            /dbs/<db>/tables/<table>/chunks/<chunk>/overlap, method=PUT

            Parameters: table data

            Load data into a overlap table

            /dbs/<db>/tables/<table>/index, method=GET

            Returns secondary index for all chunks of a given table present in worker database (mapping between object ID and chunk/sub-chunk IDs).

            /dbs/<db>/tables/<table>/chunks/<chunk>/index, method=GET

            Returns secondary index for one chunk

            xrootd API

            /xrootd/dbs, method=GET

            List databases known to xrootd

            /xrootd/dbs, method=POST

            Parameters: database name

            Make database known to xrootd

            /xrootd/dbs/<db>, method=GET

            List tables in a database known to xrootd

            /xrootd/dbs/<db>/<table>, method=GET

            List chunks in a table known to xrootd

            Services API

            /services, method=GET

            returns list of defined services (usually xrootd and mysql, optionally include wmgr itself)

            /services/<service>, method=GET

            Returns service description, state, etc.

            /services/<service>, method=PUT

            Parameters: action

            Modify service state, action could be start, stop, restart, etc.

            Show
            salnikov Andy Salnikov added a comment - - edited Here is a set of resources and operations on them for HTTP-based service implementation. This is meant to be compliant with RESTful principles. There will be corresponding JSON schema defined for each resulting data object. Database API /dbs , method=GET List existing databases. Returns a list of database (representations), each item in the list will contain database name and URI for its corresponding resource. /dbs , method=POST Parameters: database name Creates new database, fails if database already exists. On success returns database description, same object structure as returned from GET. /dbs/<db> , method=DELETE Drops database. Fails if database is not there. On success returns either "OK" response or database description. /dbs/<db>/tables , method=GET List existing tables. Returns list of table representations. /dbs/<db>/tables , method=POST Parameters: table name, table schema (or should table schema come from CSS?) Create new table, fail if table already exists. Returns table representation. /dbs/<db>/tables/<table> , method=DELETE Drops table. Fails if database is not there. On success returns either "OK" response or database description. /dbs/<db>/tables/<table>/chunks , method=GET List chunks in a table. Returns list of chunk representations. For non-chunked tables returns error code (this may need access to CSS, so we may decide to just return empty list). /dbs/<db>/tables/<table>/chunks , method=POST Parameters: chunk id Create new chunk (without data). Will make empty chunk/overlap tables based on table schema definition. /dbs/<db>/tables/<table>/data , method=PUT Parameters: table data Load data into a table /dbs/<db>/tables/<table>/chunks/<chunk>/data , method=PUT Parameters: table data Load data into a chunk table /dbs/<db>/tables/<table>/chunks/<chunk>/overlap , method=PUT Parameters: table data Load data into a overlap table /dbs/<db>/tables/<table>/index , method=GET Returns secondary index for all chunks of a given table present in worker database (mapping between object ID and chunk/sub-chunk IDs). /dbs/<db>/tables/<table>/chunks/<chunk>/index , method=GET Returns secondary index for one chunk xrootd API /xrootd/dbs , method=GET List databases known to xrootd /xrootd/dbs , method=POST Parameters: database name Make database known to xrootd /xrootd/dbs/<db> , method=GET List tables in a database known to xrootd /xrootd/dbs/<db>/<table> , method=GET List chunks in a table known to xrootd Services API /services , method=GET returns list of defined services (usually xrootd and mysql, optionally include wmgr itself) /services/<service> , method=GET Returns service description, state, etc. /services/<service> , method=PUT Parameters: action Modify service state, action could be start, stop, restart, etc.
            Hide
            salnikov Andy Salnikov added a comment -

            System architecture

            Wmgr will run as a separate application, most likely as Flask-based python script (with embedded HTTP server). Wmgr needs to know about other services that it's going to manage, so it needs to be configured with ports/sockets of xrootd instance and mysql server. Potentially those parameters could also come from CSS, but presently I think we want to be able to run (or at least start) services without CSS (but clients will need CSS to locate workers).

            Once wmgr is running it could be used to control other services instead of the init.d mechanism that we use today. This is clearly low-priority feature and there could be reasons to start all services via init.d (or other system service).

            One potential role for wmgr is to watch worker state (or health) and notify watcher/replicator/etc. about any issues. It's not clear yet if this is useful, there are certainly situations like host meltdown when wmgr itself is not available, so this need so me thinking when we design fail-over mechanisms.

            Show
            salnikov Andy Salnikov added a comment - System architecture Wmgr will run as a separate application, most likely as Flask-based python script (with embedded HTTP server). Wmgr needs to know about other services that it's going to manage, so it needs to be configured with ports/sockets of xrootd instance and mysql server. Potentially those parameters could also come from CSS, but presently I think we want to be able to run (or at least start) services without CSS (but clients will need CSS to locate workers). Once wmgr is running it could be used to control other services instead of the init.d mechanism that we use today. This is clearly low-priority feature and there could be reasons to start all services via init.d (or other system service). One potential role for wmgr is to watch worker state (or health) and notify watcher/replicator/etc. about any issues. It's not clear yet if this is useful, there are certainly situations like host meltdown when wmgr itself is not available, so this need so me thinking when we design fail-over mechanisms.
            Hide
            salnikov Andy Salnikov added a comment -

            I have added JSON schema (my very first experience with that stuff) for the data returned from above API on branch u/salnikov/DM-1900. Still work in progress, very likely will need modifications when we start implementing things.

            Show
            salnikov Andy Salnikov added a comment - I have added JSON schema (my very first experience with that stuff) for the data returned from above API on branch u/salnikov/ DM-1900 . Still work in progress, very likely will need modifications when we start implementing things.
            Hide
            salnikov Andy Salnikov added a comment -

            K-T, could you review everything that is written in the above comments to see if it makes any sense? There is also one commit, but is it not functional or testable, still you can have a look if you prefer.

            Show
            salnikov Andy Salnikov added a comment - K-T, could you review everything that is written in the above comments to see if it makes any sense? There is also one commit, but is it not functional or testable, still you can have a look if you prefer.
            salnikov Andy Salnikov made changes -
            Reviewers Kian-Tat Lim [ ktl ]
            Status In Progress [ 3 ] In Review [ 10004 ]
            Hide
            ktl Kian-Tat Lim added a comment -

            I'm not sure that a JIRA issue is the best long-term place to keep this design documentation, but I'll take a look at it, hopefully Tuesday afternoon.

            Show
            ktl Kian-Tat Lim added a comment - I'm not sure that a JIRA issue is the best long-term place to keep this design documentation, but I'll take a look at it, hopefully Tuesday afternoon.
            Hide
            salnikov Andy Salnikov added a comment -

            I can move this to a Trac page if you say so during review

            Show
            salnikov Andy Salnikov added a comment - I can move this to a Trac page if you say so during review
            Hide
            ktl Kian-Tat Lim added a comment -
            • I think either a Confluence page or an in-repo RST/MD file would be better to store design docs.
            • Security for Qserv may become an issue. Users should not be able to observe each other's queries, table creations, or even database creations. Unless we insist Qserv be deployed on a restricted network, this may mean encrypting all Qserv traffic, including query results and administrative messages.
            • The thing I dislike about ssh is its heavyweight connections. "Permanent" connections have fault-tolerance problems; lots of dynamic ssh connections are very expensive. Running HTTP over ssh does not seem ideal. I tend to dislike Unix sockets as well. HTTP/TCP for now and HTTPS later?
            • The informational side of things (GET requests) is fine. I'm still leery of having centralized "command and control" for making changes (PUT/POST requests), however. I'd prefer it if the system could be more self-organizing. But maybe that's too complex and difficult at this point.
            • You could use PUT /dbs/<db> etc. instead of POST /dbs etc. since the client knows the resulting URL already.
            • Is PUT /dbs/<db>/tables/<table>/data expected to take all the data for the entire table, or is this incremental (in which case it probably shouldn't be PUT)?
            • PUT /services/<service> should be setting a state, not performing an action, and it should be idempotent. Perhaps PUT /services/<service>/running instead?
            • Logging should be handled separately. I'd like to avoid race conditions as something else is rotating and collecting logs.
            Show
            ktl Kian-Tat Lim added a comment - I think either a Confluence page or an in-repo RST/MD file would be better to store design docs. Security for Qserv may become an issue. Users should not be able to observe each other's queries, table creations, or even database creations. Unless we insist Qserv be deployed on a restricted network, this may mean encrypting all Qserv traffic, including query results and administrative messages. The thing I dislike about ssh is its heavyweight connections. "Permanent" connections have fault-tolerance problems; lots of dynamic ssh connections are very expensive. Running HTTP over ssh does not seem ideal. I tend to dislike Unix sockets as well. HTTP/TCP for now and HTTPS later? The informational side of things (GET requests) is fine. I'm still leery of having centralized "command and control" for making changes (PUT/POST requests), however. I'd prefer it if the system could be more self-organizing. But maybe that's too complex and difficult at this point. You could use PUT /dbs/<db> etc. instead of POST /dbs etc. since the client knows the resulting URL already. Is PUT /dbs/<db>/tables/<table>/data expected to take all the data for the entire table, or is this incremental (in which case it probably shouldn't be PUT)? PUT /services/<service> should be setting a state, not performing an action, and it should be idempotent. Perhaps PUT /services/<service>/running instead? Logging should be handled separately. I'd like to avoid race conditions as something else is rotating and collecting logs.
            Hide
            salnikov Andy Salnikov added a comment -

            Thanks K-T, few answers:

            Confluence page or an in-repo RST/MD file would be better to store design docs.

            I'll transfer this to Confluence (or Trac), I'm not sure that general design docs should appear in repo.

            I tend to dislike Unix sockets as well.

            Why?

            HTTP/TCP for now and HTTPS later?

            OK. Still I'd like to keep ssh option. There may be other issues beyond our control (firewalls) that can prevent direct TCP access.

            You could use PUT /dbs/<db> etc. instead of POST /dbs etc. since the client knows the resulting URL already.

            I thought about that and I did not like it. I think usually when you want to create database you want to have it empty (no tables). PUT has to be idempotent which probably maps better to "create if database does not exist, drop all tables if it exists". I think I prefer explicit DELETE to drop database with tables and POST which means "create if does not exist, fail if exist" and is not idempotent.

            Is PUT /dbs/<db>/tables/<table>/data expected to take all the data for the entire table, or is this incremental

            It should be incremental. I thought that existing data would be overwritten if you want to load identical data. But sure one can argue that it should be an error to attempt to overwrite existing data. Should we support both (PUT for overwrite and POST for "append-only")? I'm also OK with just disabling overwrite and switching to POST.

            PUT /services/<service> should be setting a state, not performing an action, and it should be idempotent. Perhaps PUT /services/<service>/running instead?

            Well, the same state can be reached in different ways. Suppose I want running state, but the service is already running, should it just say "OK" or restart service? Sometimes I want to do explicit restart as opposed to just making sure that service is running. For restart I could probably do it in two steps going to stopped and then to running again, but this logically may be different from single restart action. I do not know good RESTful way to solve this problem, we can probably introduce restarted state to solve it but this looks very ugly.

            Logging should be handled separately.

            OK, I won't mention it again.

            Show
            salnikov Andy Salnikov added a comment - Thanks K-T, few answers: Confluence page or an in-repo RST/MD file would be better to store design docs. I'll transfer this to Confluence (or Trac), I'm not sure that general design docs should appear in repo. I tend to dislike Unix sockets as well. Why? HTTP/TCP for now and HTTPS later? OK. Still I'd like to keep ssh option. There may be other issues beyond our control (firewalls) that can prevent direct TCP access. You could use PUT /dbs/<db> etc. instead of POST /dbs etc. since the client knows the resulting URL already. I thought about that and I did not like it. I think usually when you want to create database you want to have it empty (no tables). PUT has to be idempotent which probably maps better to "create if database does not exist, drop all tables if it exists". I think I prefer explicit DELETE to drop database with tables and POST which means "create if does not exist, fail if exist" and is not idempotent. Is PUT /dbs/<db>/tables/<table>/data expected to take all the data for the entire table, or is this incremental It should be incremental. I thought that existing data would be overwritten if you want to load identical data. But sure one can argue that it should be an error to attempt to overwrite existing data. Should we support both (PUT for overwrite and POST for "append-only")? I'm also OK with just disabling overwrite and switching to POST. PUT /services/<service> should be setting a state, not performing an action, and it should be idempotent. Perhaps PUT /services/<service>/running instead? Well, the same state can be reached in different ways. Suppose I want running state, but the service is already running, should it just say "OK" or restart service? Sometimes I want to do explicit restart as opposed to just making sure that service is running. For restart I could probably do it in two steps going to stopped and then to running again, but this logically may be different from single restart action. I do not know good RESTful way to solve this problem, we can probably introduce restarted state to solve it but this looks very ugly. Logging should be handled separately. OK, I won't mention it again.
            Hide
            salnikov Andy Salnikov added a comment - - edited

            Copied things to Trac with some minor modification to take into account K-T's comments: https://dev.lsstcorp.org/trac/wiki/db/Qserv/WMGRDesign
            Further improvements should be done there, we can still discuss things on this ticket.

            Show
            salnikov Andy Salnikov added a comment - - edited Copied things to Trac with some minor modification to take into account K-T's comments: https://dev.lsstcorp.org/trac/wiki/db/Qserv/WMGRDesign Further improvements should be done there, we can still discuss things on this ticket.
            salnikov Andy Salnikov made changes -
            Remote Link This issue links to "Design page on Trac. (Web Link)" [ 12224 ]
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            ktl Kian-Tat Lim added a comment -

            Andy's responses look reasonable. No further comments at this time.

            Show
            ktl Kian-Tat Lim added a comment - Andy's responses look reasonable. No further comments at this time.
            ktl Kian-Tat Lim made changes -
            Status In Review [ 10004 ] Reviewed [ 10101 ]
            salnikov Andy Salnikov made changes -
            Resolution Done [ 10000 ]
            Status Reviewed [ 10101 ] Done [ 10002 ]

              People

              Assignee:
              salnikov Andy Salnikov
              Reporter:
              salnikov Andy Salnikov
              Reviewers:
              Kian-Tat Lim
              Watchers:
              Andy Salnikov, Kian-Tat Lim
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              0 Vote for this issue
              Watchers:
              2 Start watching this issue

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