The Thread dump result table of Spark UI can provide some clues to find out thread locks issue, such as:
Thread ID | Thread Name | Thread State | Thread Locks 13 | NonBlockingInputStreamThread | WAITING | Blocked by Thread Some(48) Lock(jline.internal.NonBlockingInputStream@103008951}) 48 | Thread-16 | RUNNABLE | Monitor(jline.internal.NonBlockingInputStream@103008951}) And echo thread row can show the call stacks after being clicked, then you can check the root cause of holding locks like this(Thread 48 of above): org.fusesource.jansi.internal.Kernel32.ReadConsoleInputW(Native Method) org.fusesource.jansi.internal.Kernel32.readConsoleInputHelper(Kernel32.java:811) org.fusesource.jansi.internal.Kernel32.readConsoleKeyInput(Kernel32.java:842) org.fusesource.jansi.internal.WindowsSupport.readConsoleInput(WindowsSupport.java:97) jline.WindowsTerminal.readConsoleInput(WindowsTerminal.java:222) <snip...> Hope it can help you. -- Cheers, -z On Thu, 16 Apr 2020 16:36:42 +0900 Jungtaek Lim <kabhwan.opensou...@gmail.com> wrote: > Do thread dump continuously, per specific period (like 1s) and see the > change of stack / lock for each thread. (This is not easy to be done in UI > so maybe doing manually would be the only option. Not sure Spark UI will > provide the same, haven't used at all.) > > It will tell which thread is being blocked (even it's shown as running) and > which point to look at. > > On Thu, Apr 16, 2020 at 4:29 PM Ruijing Li <liruijin...@gmail.com> wrote: > > > Once I do. thread dump, what should I be looking for to tell where it is > > hanging? Seeing a lot of timed_waiting and waiting on driver. Driver is > > also being blocked by spark UI. If there are no tasks, is there a point to > > do thread dump of executors? > > > > On Tue, Apr 14, 2020 at 4:49 AM Gabor Somogyi <gabor.g.somo...@gmail.com> > > wrote: > > > >> The simplest way is to do thread dump which doesn't require any fancy > >> tool (it's available on Spark UI). > >> Without thread dump it's hard to say anything... > >> > >> > >> On Tue, Apr 14, 2020 at 11:32 AM jane thorpe <janethor...@aol.com.invalid> > >> wrote: > >> > >>> Here a is another tool I use Logic Analyser 7:55 > >>> https://youtu.be/LnzuMJLZRdU > >>> > >>> you could take some suggestions for improving performance queries. > >>> https://dzone.com/articles/why-you-should-not-use-select-in-sql-query-1 > >>> > >>> > >>> Jane thorpe > >>> janethor...@aol.com > >>> > >>> > >>> -----Original Message----- > >>> From: jane thorpe <janethor...@aol.com.INVALID> > >>> To: janethorpe1 <janethor...@aol.com>; mich.talebzadeh < > >>> mich.talebza...@gmail.com>; liruijing09 <liruijin...@gmail.com>; user < > >>> user@spark.apache.org> > >>> Sent: Mon, 13 Apr 2020 8:32 > >>> Subject: Re: Spark hangs while reading from jdbc - does nothing Removing > >>> Guess work from trouble shooting > >>> > >>> > >>> > >>> This tool may be useful for you to trouble shoot your problems away. > >>> > >>> > >>> https://www.javacodegeeks.com/2020/04/simplifying-apm-remove-the-guesswork-from-troubleshooting.html > >>> > >>> > >>> "APM tools typically use a waterfall-type view to show the blocking > >>> time of different components cascading through the control flow within an > >>> application. > >>> These types of visualizations are useful, and AppOptics has them, but > >>> they can be difficult to understand for those of us without a PhD." > >>> > >>> Especially helpful if you want to understand through visualisation and > >>> you do not have a phD. > >>> > >>> > >>> Jane thorpe > >>> janethor...@aol.com > >>> > >>> > >>> -----Original Message----- > >>> From: jane thorpe <janethor...@aol.com.INVALID> > >>> To: mich.talebzadeh <mich.talebza...@gmail.com>; liruijing09 < > >>> liruijin...@gmail.com>; user <user@spark.apache.org> > >>> CC: user <user@spark.apache.org> > >>> Sent: Sun, 12 Apr 2020 4:35 > >>> Subject: Re: Spark hangs while reading from jdbc - does nothing > >>> > >>> You seem to be implying the error is intermittent. > >>> You seem to be implying data is being ingested via JDBC. So the > >>> connection has proven itself to be working unless no data is arriving from > >>> the JDBC channel at all. If no data is arriving then one could say it > >>> could be the JDBC. > >>> If the error is intermittent then it is likely a resource involved in > >>> processing is filling to capacity. > >>> Try reducing the data ingestion volume and see if that completes, then > >>> increase the data ingested incrementally. > >>> I assume you have run the job on small amount of data so you have > >>> completed your prototype stage successfully. > >>> > >>> ------------------------------ > >>> On Saturday, 11 April 2020 Mich Talebzadeh <mich.talebza...@gmail.com> > >>> wrote: > >>> Hi, > >>> > >>> Have you checked your JDBC connections from Spark to Oracle. What is > >>> Oracle saying? Is it doing anything or hanging? > >>> > >>> set pagesize 9999 > >>> set linesize 140 > >>> set heading off > >>> select SUBSTR(name,1,8) || ' sessions as on '||TO_CHAR(CURRENT_DATE, > >>> 'MON DD YYYY HH:MI AM') from v$database; > >>> set heading on > >>> column spid heading "OS PID" format a6 > >>> column process format a13 heading "Client ProcID" > >>> column username format a15 > >>> column sid format 999 > >>> column serial# format 99999 > >>> column STATUS format a3 HEADING 'ACT' > >>> column last format 9,999.99 > >>> column TotGets format 999,999,999,999 HEADING 'Logical I/O' > >>> column phyRds format 999,999,999 HEADING 'Physical I/O' > >>> column total_memory format 999,999,999 HEADING 'MEM/KB' > >>> -- > >>> SELECT > >>> substr(a.username,1,15) "LOGIN" > >>> , substr(a.sid,1,5) || ','||substr(a.serial#,1,5) AS > >>> "SID/serial#" > >>> , TO_CHAR(a.logon_time, 'DD/MM HH:MI') "LOGGED IN SINCE" > >>> , substr(a.machine,1,10) HOST > >>> , substr(p.username,1,8)||'/'||substr(p.spid,1,5) "OS PID" > >>> , substr(a.osuser,1,8)||'/'||substr(a.process,1,5) "Client PID" > >>> , substr(a.program,1,15) PROGRAM > >>> --,ROUND((CURRENT_DATE-a.logon_time)*24) AS "Logged/Hours" > >>> , ( > >>> select round(sum(ss.value)/1024) from v$sesstat ss, > >>> v$statname sn > >>> where ss.sid = a.sid and > >>> sn.statistic# = ss.statistic# and > >>> -- sn.name in ('session pga memory') > >>> sn.name in ('session pga memory','session uga > >>> memory') > >>> ) AS total_memory > >>> , (b.block_gets + b.consistent_gets) TotGets > >>> , b.physical_reads phyRds > >>> , decode(a.status, 'ACTIVE', 'Y','INACTIVE', 'N') STATUS > >>> , CASE WHEN a.sid in (select sid from v$mystat where rownum = 1) > >>> THEN '<-- YOU' ELSE ' ' END "INFO" > >>> FROM > >>> v$process p > >>> ,v$session a > >>> ,v$sess_io b > >>> WHERE > >>> a.paddr = p.addr > >>> AND p.background IS NULL > >>> --AND a.sid NOT IN (select sid from v$mystat where rownum = 1) > >>> AND a.sid = b.sid > >>> AND a.username is not null > >>> --AND (a.last_call_et < 3600 or a.status = 'ACTIVE') > >>> --AND CURRENT_DATE - logon_time > 0 > >>> --AND a.sid NOT IN ( select sid from v$mystat where rownum=1) -- > >>> exclude me > >>> --AND (b.block_gets + b.consistent_gets) > 0 > >>> ORDER BY a.username; > >>> exit > >>> > >>> HTH > >>> > >>> Dr Mich Talebzadeh > >>> > >>> LinkedIn * > >>> https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw > >>> <https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw>* > >>> > >>> http://talebzadehmich.wordpress.com > >>> > >>> *Disclaimer:* Use it at your own risk. Any and all responsibility for > >>> any loss, damage or destruction of data or any other property which may > >>> arise from relying on this email's technical content is explicitly > >>> disclaimed. The author will in no case be liable for any monetary damages > >>> arising from such loss, damage or destruction. > >>> > >>> > >>> > >>> On Fri, 10 Apr 2020 at 17:37, Ruijing Li <liruijin...@gmail.com> wrote: > >>> > >>> Hi all, > >>> > >>> I am on spark 2.4.4 and using scala 2.11.12, and running cluster mode on > >>> mesos. I am ingesting from an oracle database using spark.read.jdbc. I am > >>> seeing a strange issue where spark just hangs and does nothing, not > >>> starting any new tasks. Normally this job finishes in 30 stages but > >>> sometimes it stops at 29 completed stages and doesn’t start the last > >>> stage. > >>> The spark job is idling and there is no pending or active task. What could > >>> be the problem? Thanks. > >>> -- > >>> Cheers, > >>> Ruijing Li > >>> > >>> -- > > Cheers, > > Ruijing Li > > --------------------------------------------------------------------- To unsubscribe e-mail: user-unsubscr...@spark.apache.org
