api - Apache Ignite Locks for synchronizing arbitrary computation across the grid -


i have simple question can't find definitive answer in apache ignite docs.

i see there api in apache ignite create explicit lock. understand these locks used writing cache entries , done implicitly.

however, can (should i) able explicitly create lock in grid synchronizing computation arbitrary code. here's i'm thinking of doing:

  1. request comes api.
  2. i try enter lock on ignite cache
  3. if can enter lock calculation (which should done on 1 of api instances @ given time)
  4. if can't enter lock, return 409 error code (duplicate request)
  5. i exit lock

are there potential caveats doing this? should watch out potential pitfalls?

yes, can use cache locks entering critical section in distributed manner. here can find how: https://apacheignite.readme.io/docs/distributed-locks

here can find more documentation on ignite locks: https://www.gridgain.com/sdk/pe/latest/javadoc/org/apache/ignite/ignitelock.html

ignite cache locks implement mutual exclusion, can rely on no 2 threads or processes holding 1 lock @ same time. should make sure nodes use replicas of same cache acquire locks (cache not local, etc) , cache transactional.

usually locks used perform complex operations on cache atomically. if want use locking without changing cache, may symptom of don't need lock, or should use synchronization mechanism of resource trying utilize inside of critical section. depends on computations trying perform.


Comments

Post a Comment

Popular posts from this blog

PHP and MySQL WP -

i trying accomplish 2 things here code. writing php directly wp page using insert php plugin. 1) query mysql database , return results 1 column 4 columns. 2) make each result own hyperlink directs user new wp page runs new query on page. i able query show results , turn results dynamic hyperlink, cannot formatting down. right returns result 1 column. here have: [insert_php] $servername = "localhost"; $username = "login"; //edited privacy $password = "password"; //edited privacy $database = "database"; //edited privacy // create connection $conn = new mysqli($servername, $username, $password, $database); // check connection if ($conn->connect_error) { die("connection failed: " . $conn->connect_error); } echo "connected successfully"; //get results database $result = mysqli_query($conn,"select mine mines order mine"); $all_property = array(); //declare array saving property //showing proper...
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

go - golang pprof for c library code -

i have been trying profile golang application pprof, seems details of c code(linked static library) missed in output result. flame graph from frame graph can see c code time consuming reported within "runtime._externalcode", no details @ all. , sure static library compiled debug enable. so there way make pprof details(like stack trace) of 3rd party c code? or there other golang profiling tool this?
Read more