iemejia commented on code in PR #12400:
URL: https://github.com/apache/gluten/pull/12400#discussion_r3549472508
##########
backends-velox/src/main/scala/org/apache/gluten/config/VeloxConfig.scala:
##########
@@ -530,10 +530,35 @@ object VeloxConfig extends ConfigRegistry {
val COLUMNAR_VELOX_FILE_HANDLE_CACHE_ENABLED =
buildStaticConf("spark.gluten.sql.columnar.backend.velox.fileHandleCacheEnabled")
.doc(
- "Disables caching if false. File handle cache should be disabled " +
- "if files are mutable, i.e. file content may change while file path
stays the same.")
+ "Enables caching of file handles to avoid repeated open/close overhead
on remote " +
+ "filesystems. Should be disabled if files are mutable, i.e. file
content may " +
+ "change while file path stays the same.")
.booleanConf
- .createWithDefault(false)
+ .createWithDefault(true)
+
+ val COLUMNAR_VELOX_NUM_CACHE_FILE_HANDLES =
+
buildStaticConf("spark.gluten.sql.columnar.backend.velox.numCacheFileHandles")
+ .doc(
+ "Maximum number of entries in the file handle cache. Each entry holds
an open " +
+ "file descriptor (local FS) or connection state (remote FS). Note
that on " +
+ "local filesystems, high values may approach the OS file descriptor
limit " +
+ "(ulimit -n). On remote object stores (S3, ABFS, GCS) entries
represent " +
+ "network connections/sockets rather than per-file OS file
descriptors, but " +
+ "they can still count toward OS resource limits (ulimit -n).")
+ .intConf
+ .checkValue(_ > 0, "must be a positive number")
+ .createWithDefault(10000)
+
+ val COLUMNAR_VELOX_FILE_HANDLE_EXPIRATION_DURATION_MS =
+
buildStaticConf("spark.gluten.sql.columnar.backend.velox.fileHandleExpirationDurationMs")
+ .doc(
+ "Expiration time in milliseconds for cached file handles. Handles not
accessed " +
+ "within this duration are evicted from the cache. This prevents
stale handles " +
+ "from accumulating (e.g., expired HDFS leases, closed remote
connections). " +
+ "A value of 0 disables TTL-based eviction.")
+ .longConf
Review Comment:
Fixed. Changed to `.timeConf(TimeUnit.MILLISECONDS)` for consistency with
`reclaimMaxWaitMs` and `asyncTimeoutOnTaskStopping`. The native conf map
default remains a numeric string since the C++ side parses it as int64.
##########
ep/build-velox/src/file-handle-cache-ttl.patch:
##########
@@ -0,0 +1,14 @@
+diff --git a/velox/connectors/hive/HiveConnector.cpp
b/velox/connectors/hive/HiveConnector.cpp
+index abc13acea..861f95c7f 100644
+--- a/velox/connectors/hive/HiveConnector.cpp
++++ b/velox/connectors/hive/HiveConnector.cpp
+@@ -40,7 +40,8 @@ HiveConnector::HiveConnector(
+ fileHandleFactory_(
+ hiveConfig_->isFileHandleCacheEnabled()
+ ? std::make_unique<SimpleLRUCache<FileHandleKey, FileHandle>>(
+- hiveConfig_->numCacheFileHandles())
++ hiveConfig_->numCacheFileHandles(),
++ hiveConfig_->fileHandleExpirationDurationMs())
Review Comment:
Yes, opened https://github.com/facebookincubator/velox/pull/18072 to
upstream this. Once merged, the reverse-apply check in `get-velox.sh` will
detect it and skip the patch automatically.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
