Updated Branches: refs/heads/master cf309e544 -> 5a8a28af9
ACCUMULO-1905 added documentation about hsync to tserver.mutation.queue.max Project: http://git-wip-us.apache.org/repos/asf/accumulo/repo Commit: http://git-wip-us.apache.org/repos/asf/accumulo/commit/39260cb9 Tree: http://git-wip-us.apache.org/repos/asf/accumulo/tree/39260cb9 Diff: http://git-wip-us.apache.org/repos/asf/accumulo/diff/39260cb9 Branch: refs/heads/master Commit: 39260cb90be7129d91c21a3f85f625f8578ae554 Parents: 747c7cd Author: Keith Turner <ktur...@apache.org> Authored: Tue Dec 3 12:18:59 2013 -0500 Committer: Keith Turner <ktur...@apache.org> Committed: Tue Dec 3 12:18:59 2013 -0500 ---------------------------------------------------------------------- core/src/main/java/org/apache/accumulo/core/conf/Property.java | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/accumulo/blob/39260cb9/core/src/main/java/org/apache/accumulo/core/conf/Property.java ---------------------------------------------------------------------- diff --git a/core/src/main/java/org/apache/accumulo/core/conf/Property.java b/core/src/main/java/org/apache/accumulo/core/conf/Property.java index f4c1778..424b737 100644 --- a/core/src/main/java/org/apache/accumulo/core/conf/Property.java +++ b/core/src/main/java/org/apache/accumulo/core/conf/Property.java @@ -122,7 +122,10 @@ public enum Property { TSERV_PORTSEARCH("tserver.port.search", "false", PropertyType.BOOLEAN, "if the ports above are in use, search higher ports until one is available"), TSERV_CLIENTPORT("tserver.port.client", "9997", PropertyType.PORT, "The port used for handling client connections on the tablet servers"), TSERV_MUTATION_QUEUE_MAX("tserver.mutation.queue.max", "256K", PropertyType.MEMORY, - "The amount of memory to use to store write-ahead-log mutations-per-session before flushing them."), + "The amount of memory to use to store write-ahead-log mutations-per-session before flushing them. Since the buffer is per write session, consider the" + + " max number of concurrent writer when configuring. When using Hadoop 2, Accumulo will call hsync() on the WAL . For a small number of " + + "concurrent writers, increasing this buffer size decreases the frequncy of hsync calls. For a large number of concurrent writers a small buffers " + + "size is ok because of group commit."), TSERV_TABLET_SPLIT_FINDMIDPOINT_MAXOPEN("tserver.tablet.split.midpoint.files.max", "30", PropertyType.COUNT, "To find a tablets split points, all index files are opened. This setting determines how many index " + "files can be opened at once. When there are more index files than this setting multiple passes "
