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author | Pieter Wuille <pieter.wuille@gmail.com> | 2014-10-16 12:23:50 -0700 |
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committer | Pieter Wuille <pieter.wuille@gmail.com> | 2014-10-16 12:23:50 -0700 |
commit | 5b9f8425a515739e2149bf5bfb2ae6ed60bfbaf2 (patch) | |
tree | bacc7dd4d2f77da27499000d6f12655a3f6463f3 /src/leveldb/doc | |
parent | e8f6d54f1f58d9a5998e37367b84b427e51e1ad7 (diff) | |
parent | 4b0e2d75d78036e7e76fd9584e17b0379ba08d24 (diff) |
Merge src/leveldb changes for LevelDB 1.18.
Diffstat (limited to 'src/leveldb/doc')
-rw-r--r-- | src/leveldb/doc/bench/db_bench_tree_db.cc | 2 | ||||
-rw-r--r-- | src/leveldb/doc/impl.html | 4 | ||||
-rw-r--r-- | src/leveldb/doc/log_format.txt | 6 |
3 files changed, 6 insertions, 6 deletions
diff --git a/src/leveldb/doc/bench/db_bench_tree_db.cc b/src/leveldb/doc/bench/db_bench_tree_db.cc index ed86f031c2..4ca381f11f 100644 --- a/src/leveldb/doc/bench/db_bench_tree_db.cc +++ b/src/leveldb/doc/bench/db_bench_tree_db.cc @@ -338,7 +338,7 @@ class Benchmark { bool write_sync = false; if (name == Slice("fillseq")) { Write(write_sync, SEQUENTIAL, FRESH, num_, FLAGS_value_size, 1); - + DBSynchronize(db_); } else if (name == Slice("fillrandom")) { Write(write_sync, RANDOM, FRESH, num_, FLAGS_value_size, 1); DBSynchronize(db_); diff --git a/src/leveldb/doc/impl.html b/src/leveldb/doc/impl.html index 28817fe0da..6a468be095 100644 --- a/src/leveldb/doc/impl.html +++ b/src/leveldb/doc/impl.html @@ -111,7 +111,7 @@ A compaction merges the contents of the picked files to produce a sequence of level-(L+1) files. We switch to producing a new level-(L+1) file after the current output file has reached the target file size (2MB). We also switch to a new output file when the key -range of the current output file has grown enough to overlap more then +range of the current output file has grown enough to overlap more than ten level-(L+2) files. This last rule ensures that a later compaction of a level-(L+1) file will not pick up too much data from level-(L+2). @@ -151,7 +151,7 @@ compaction cost will be approximately 0.5 second. If we throttle the background writing to something small, say 10% of the full 100MB/s speed, a compaction may take up to 5 seconds. If the user is writing at 10MB/s, we might build up lots of level-0 files -(~50 to hold the 5*10MB). This may signficantly increase the cost of +(~50 to hold the 5*10MB). This may significantly increase the cost of reads due to the overhead of merging more files together on every read. diff --git a/src/leveldb/doc/log_format.txt b/src/leveldb/doc/log_format.txt index 5228f624de..4cca5ef6ea 100644 --- a/src/leveldb/doc/log_format.txt +++ b/src/leveldb/doc/log_format.txt @@ -11,7 +11,7 @@ Each block consists of a sequence of records: A record never starts within the last six bytes of a block (since it won't fit). Any leftover bytes here form the trailer, which must -consist entirely of zero bytes and must be skipped by readers. +consist entirely of zero bytes and must be skipped by readers. Aside: if exactly seven bytes are left in the current block, and a new non-zero length record is added, the writer must emit a FIRST record @@ -33,8 +33,8 @@ The FULL record contains the contents of an entire user record. FIRST, MIDDLE, LAST are types used for user records that have been split into multiple fragments (typically because of block boundaries). FIRST is the type of the first fragment of a user record, LAST is the -type of the last fragment of a user record, and MID is the type of all -interior fragments of a user record. +type of the last fragment of a user record, and MIDDLE is the type of +all interior fragments of a user record. Example: consider a sequence of user records: A: length 1000 |