-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Robert,
On 1/30/15 12:19 PM, Robert Anderson wrote: > Every day we are getting deadlocks like that: > > Found one Java-level deadlock: ============================= > "ajp-apr-8009-exec-13 ^ 30/01/2015 - 09:39:58 - > DB:DATASOURCE(java:/comp/env/jdbc/cacheapp)": waiting to lock > monitor 0x000000001504e6d8 (object 0x000000071ba001d0, a > com.intersys.jdbc.CacheConnection), which is held by > "PoolCleaner[1070846187:1422601344160]" > "PoolCleaner[1070846187:1422601344160]": waiting to lock monitor > 0x0000000012ce77e8 (object 0x000000071ba007f0, a > com.intersys.jdbc.CacheConnection$MessageCount), which is held by > "ajp-apr-8009-exec-13 ^ 30/01/2015 - 09:39:58 - > DB:DATASOURCE(java:/comp/env/jdbc/cacheapp)" D'oh. > Are there anything that we can do to avoid it? > > > Server version: Apache Tomcat/7.0.57 Server built: Nov 3 2014 > 08:39:16 UTC Server number: 7.0.57.0 OS Name: Linux OS > Version: 2.6.18-194.17.1.el5 Architecture: amd64 JVM Version: > 1.7.0_71-b14 JVM Vendor: Oracle Corporation > > > Datasource definition: > > <Resource name="jdbc/cacheapp" auth="Container" > type="javax.sql.DataSource" removeAbandoned="true" > removeAbandonedTimeout="300" maxActive="120" maxIdle="20" > minIdle="1" maxWait="10000" validationQuery="select 1" > testOnBorrow="true" validationInterval="0" In general, I would expect validationInterval="0" to disable validation, but the documentation does not say anything about a zero value. Is it possible that you are /constantly/ validating? If you change that number to something higher (in ms: maybe "10000" for 10s) you will reduce the chance for this deadlock? I suspect this is a bug (deadlock should not occur), but you can maybe avoid it by changing your configuration. > fairQueue="false" There is a flaw in the documentation surrounding this setting on Linux, but it's only when fairQueue="true", so it shouldn't matter for you. But you might want to consider leaving the queue "fair". It's not clear from the documentation whether enabling queue fairness /decreases/ performance or the opposite (but it seems reasonable that enforcing queue fairness would probably decrease performance). - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJUy7/vAAoJEBzwKT+lPKRYCGwP/ijUIjnHQ39rE6qzZ9GIGwad ZkGQTFZlZw03yxkcu9Dzqb7LdN/RWHaHzi5jZyWkJnz7SO6EIe9gyUya2kvojF4x 9u3+TrDT/+fTQd17UvEuKAzRqV56PGFdfWGMNlQmk1ndOQYFRwD6B3vFF0SCMbw0 q0Z5qIHw5YqgVg+xfsA/ubsrOX8prI0c0AzgN8yFd5Jv+Ts80rD4PNr1kfN+K6oE N2komJkEEn3PpSSFdhut3FPcZZingm5xiV/2u5hwOOvHhAZIG7qpP0RwEDN2fPRd MEC1j0dO2k+JZW8PC5RWPGyqEg9F+213sw8Qc8idOf2zHNXYwzxtZcD8i+iokYLS 8Tn5ByYRgX5ZEdTA1e1DUIM6BTRgA+HX30T5lRBOBFC9/baKcrRVR9tS9gn9zQBj HV1Xfoy6V/efL7AHAOd1nPL+SswzVYs2U0HtOOA4MjYLguhuRNPx3ofWufESXJ1T 5n6h7ipN1mda8LcMtK3bVSrBfL+SnU5p7bwmQvtRX33xeKMOgv8XnWWaFc1eWLHg yrS6KZSVUhIHlLwy2tBJasWB2VtxcEOoSjOWJfHBgPIsAp3TcwyNbNZ3JVDAMW1D 8kjmDJnBguuHbz+tn4qabPB8TmcO/78GrcOr+qY42IjIJQM4kX0otXzngh+nI21z Fm3UQnSzGs29jQCwe5Ho =v9Pk -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
