
ISSUES . APACHE . ORG {
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Title:
[HIVE-7926] long-lived daemons for query fragment execution, I/O and caching - ASF JIRA
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30 years and 2 months (reg. 1995-04-11).
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Keywords {๐}
llap, closed, sergey, shelukhin, resolved, prasanth, jayachandran, siddharth, seth, branch, tez, added, merge, fix, master, comment, unassigned, cache, open, add, query, gunther, hagleitner, gopal, vijayaraghavan, orc, execution, daemons, tests, work, hive, sep, data, tasks, daemon, test, yarn, make, npe, task, queries, running, multiple, design, file, join, matt, mccline, scheduling, update,
Topics {โ๏ธ}
org/jira/secure/attachment/12665704/llapdesigndocument long-lived service interacting introduce low-level cache jit-friendly operator pipelines row-level vectorized sargs auto-organizing slider instances long-lived daemons running improve high-level cache query-specific priority assigned existing process-based tasks wait queue pre-emption create webapp/llap directory brock noland added determine run/preemption order invalid containerid prefix high-level design multi-threaded processing table cache details hybrid model consists read/uncompress thread vectorized map join task scheduler thread-count cache throw error diskrangelist helper init enable yourkit profiling prep object registry hybrid execution model attachments options llapdesigndocument showing explain diff avoid log locks cache hit rate object estimator digs shannon ladymon added wait queue comparator unlocking cache data print ascii art invoked inside minitezcluster tpch q1 1k reducer fetch failed investigate locality issues org/wiki/vulcan_salute evolving tez apis process method call fragment finishable state bulk subtask move lefty leverenz added arun suresh added fix server init web services section queued work times
Questions {โ}
- Can I have access?
- Can you speak to how this would work?
- Given that it is still an open YARN jira, can you kindly point me to an LLAP jira / code / doc describing how this is currently done?
- In the sentence: "The node allows parallel execution for multiple query fragments from different queries and sessionsโ - what does "the node" refer to?
- In the sentence: โThe initial stage of the query is pushed into #LLAP, large shuffle is performed in their own containersโ - What does "their own containers" refer to?
- Is there some academic or commercial research which is motivating your design?
- Should I delete that link from the page, or is there an updated link you'd like to add?
- Should this section be deleted, or is there content you intend to add?
- By this I assume a tez vertex interacts with the LLAP daemon to ensure the combined resources do not exceed what is allocated to eaither one of them, right ?
- Sershe, can you clarify why the # is used in #LLAP in the design doc ?
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